Embedding Matplotlib plot inside Tkinter Label - python

I just put together this basic retirement savings calculator using python. While this works, I had a couple of questions:
Is there a way to embed the plot directly, i.e. without saving it as a PNG and then loading it again?
Line 30 reads img.image = render. While I understand that this updates the image attribute for the label defined on line 29, I am confused why this line is required, since we already call out image = render on line 29 itself. Why twice?
from tkinter import *
import pandas as pd
import matplotlib.pyplot as plt
from PIL import ImageTk, Image
def generate_plot():
rate = float(entry_1.get())
years_saving = int(entry_2.get())
initial_savings = float(entry_3.get())
yearly_contribution = float(entry_4.get())
model = pd.DataFrame({'time': range(years_saving)})
model['simple_exp'] = [initial_savings*rate**year for year in model['time']]
model['yearly_invest'] = model['simple_exp'] + [yearly_contribution*(rate**year - 1)/(rate-1) for year in model['time']]
final = model['yearly_invest'].sort_values(ascending= False).iloc[0]
label_5 = Label(frame, text=f"You would have saved INR {final} by retirement")
label_5.grid(row=0, column=0)
plt.plot(model['time'], model['yearly_invest'])
plt.title('Retirement Savings')
plt.xlabel('Time in Years)')
plt.ylabel('INR (Lacs)')
plt.savefig('plot.png')
load = Image.open('plot.png')
render = ImageTk.PhotoImage(load)
img = Label(frame, image = render)
img.image = render
img.grid(row=1, column=0)
# my_label = Label(frame, image = my_img)
# my_label.grid(row=1, column=0)
# img = ImageTk.PhotoImage(Image.open('plot.png'))
# img_label = Label(frame, image = img)
# img_label.grid(row=1, column=0)
root = Tk()
label_1 = Label(root, text = 'INTEREST RATE(%)')
label_2 = Label(root, text = 'NUMBER OF YEARS IN SAVINGS')
label_3 = Label(root, text = 'INITIAL CORPUS (INR LACS)')
label_4 = Label(root, text = 'YEARLY CONTRIBUTION (INR LACS')
frame = Frame(root, width=300, height=300)
button = Button(root, text="GENERATE PLOT", command = generate_plot, padx = 5, pady=5)
entry_1 = Entry(root)
entry_2 = Entry(root)
entry_3 = Entry(root)
entry_4 = Entry(root)
label_1.grid(row=0, column=0, pady=5, padx=5)
entry_1.grid(row=0, column=1, pady=5, padx=5)
label_2.grid(row=1, column=0, pady=5, padx=5)
entry_2.grid(row=1, column=1, pady=5, padx=5)
label_3.grid(row=2, column=0, pady=5, padx=5)
entry_3.grid(row=2, column=1, pady=5, padx=5)
label_4.grid(row=3, column=0, pady=5, padx=5)
entry_4.grid(row=3, column=1, pady=5, padx=5)
button.grid(row=4,column=0, columnspan=2, pady=20, padx=5)
frame.grid(row=5, column=0, columnspan = 2, padx = 5, pady = 5)
root.mainloop()


You can try saving to a stream using BytesIO:
from tkinter import *
from io import BytesIO
import pandas as pd
import matplotlib.pyplot as plt
from PIL import ImageTk, Image
def generate_plot():
rate = float(entry_1.get())
years_saving = int(entry_2.get())
initial_savings = float(entry_3.get())
yearly_contribution = float(entry_4.get())
model = pd.DataFrame({'time': range(years_saving)})
model['simple_exp'] = [initial_savings*rate**year for year in model['time']]
model['yearly_invest'] = model['simple_exp'] + [yearly_contribution*(rate**year - 1)/(rate-1) for year in model['time']]
final = model['yearly_invest'].sort_values(ascending= False).iloc[0]
label_5 = Label(frame, text=f"You would have saved INR {final} by retirement")
label_5.grid(row=0, column=0)
plt.plot(model['time'], model['yearly_invest'])
plt.title('Retirement Savings')
plt.xlabel('Time in Years)')
plt.ylabel('INR (Lacs)')
img_data = BytesIO()
plt.savefig(img_data)
load = Image.open(img_data)
render = ImageTk.PhotoImage(load)
img = Label(frame, image = render)
img.image = render # This is needed to keep a reference to the image, see the link below
img.grid(row=1, column=0)
# my_label = Label(frame, image = my_img)
# my_label.grid(row=1, column=0)
# img = ImageTk.PhotoImage(Image.open('plot.png'))
# img_label = Label(frame, image = img)
# img_label.grid(row=1, column=0)
root = Tk()
label_1 = Label(root, text = 'INTEREST RATE(%)')
label_2 = Label(root, text = 'NUMBER OF YEARS IN SAVINGS')
label_3 = Label(root, text = 'INITIAL CORPUS (INR LACS)')
label_4 = Label(root, text = 'YEARLY CONTRIBUTION (INR LACS')
frame = Frame(root, width=300, height=300)
button = Button(root, text="GENERATE PLOT", command = generate_plot, padx = 5, pady=5)
entry_1 = Entry(root)
entry_2 = Entry(root)
entry_3 = Entry(root)
entry_4 = Entry(root)
label_1.grid(row=0, column=0, pady=5, padx=5)
entry_1.grid(row=0, column=1, pady=5, padx=5)
label_2.grid(row=1, column=0, pady=5, padx=5)
entry_2.grid(row=1, column=1, pady=5, padx=5)
label_3.grid(row=2, column=0, pady=5, padx=5)
entry_3.grid(row=2, column=1, pady=5, padx=5)
label_4.grid(row=3, column=0, pady=5, padx=5)
entry_4.grid(row=3, column=1, pady=5, padx=5)
button.grid(row=4,column=0, columnspan=2, pady=20, padx=5)
frame.grid(row=5, column=0, columnspan = 2, padx = 5, pady = 5)
root.mainloop()
Reference: Why do my Tkinter images not appear?

Related

How to solve the "bad window path name ".!labelframe.!canvas.!frame" error in tkinter python?

This is my code:
mycanvas = Canvas(self.search_result_frame)
mycanvas.pack(side=LEFT)
yscrollbar = ttk.Scrollbar(self.search_result_frame, orient="vertical", command=mycanvas.yview)
yscrollbar.pack(side=RIGHT, fill=Y)
mycanvas.configure(yscrollcommand=yscrollbar.set)
mycanvas.bind('<Configure>', lambda e: mycanvas.configure(scrollregion = mycanvas.bbox('all')))
self.sample_frame = Frame(mycanvas)
mycanvas.create_window((0,0), window=self.sample_frame, anchor=E)
for widget in self.search_result_frame.winfo_children():
widget.destroy()
if len(matching_bills) > 0:
for bill in matching_bills:
with open(f'{self.bill_folder}//{bill}//data//bill_details.json', 'r') as bill_json_file:
bill_details = json.loads(bill_json_file.read())
customer_name = bill_details["customer_details"][0]
payment_method = bill_details["payment_method"]
date_of_issue = bill_details["date_of_issue"]
date_of_issue = datetime.strptime(date_of_issue, "%d/%m/%Y")
date_of_issue = date_of_issue.strftime("%d %b %Y")
# # -------------------- Search Result Frame Contents
result_frame = Frame(self.sample_frame, bg=self.bg3, bd=5, relief=GROOVE)
result_frame.pack(fill=BOTH, pady=2)
result_billno_lbl = Label(result_frame, text=bill, bg=self.bg1, fg="#FFF", font=self.search_results_font1, padx=22, pady=3)
result_billno_lbl.grid(row=0, column=0, padx=50, pady=8, sticky=W)
billed_to_lbl = Label(result_frame, text=f"Billed To - {customer_name}", bg=self.bg1, fg="#FFF", font=self.search_results_font2, bd=2, relief=RAISED, padx=12, pady=3)
billed_to_lbl.grid(row=0, column=1, padx=80, sticky=W)
billed_type_lbl = Label(result_frame, text=f"Bill Type - {payment_method}", bg=self.bg1, fg="#FFF", font=self.search_results_font2, bd=2, relief=RAISED, padx=12, pady=3)
billed_type_lbl.grid(row=0, column=2, sticky=W)
issued_on_lbl = Label(result_frame, text=f"Issued On - {date_of_issue}", bg=self.bg1, fg="#FFF",
font=self.search_results_font2, bd=2, relief=RAISED, padx=12, pady=3)
issued_on_lbl.grid(row=0, column=3, padx=80, sticky=W)
view_btn = Button(result_frame, text="View", font="Comicsan 14", bd=2, relief=GROOVE, bg="#000", fg="#FFF", padx=1, command=lambda bill=bill: self.view_bill(bill))
view_btn.grid(row=0, column=4, padx=3, columnspan=2, sticky=W)
elif len(matching_bills) == 0:
for widgets in self.search_result_frame.winfo_children():
widgets.destroy()
no_result_lbl = Label(self.search_result_frame, text=f"No search result found for {bill_cat}", font=self.search_results_font1, bg=self.bg3, fg="#FFF")
no_result_lbl.pack(fill=X)
When I run it, it shows me the bad window path name ".!labelframe.!canvas.!frame error and when I try to do the same thing without object-oriented in tkinter then it works well !

How to update LabelFrame title (Tkinter)

I am a novice and working with Tkinter for the first time. My project is an "I Spy" book which moves picture to picture utilizing buttons. I like the look of the LabelFrame widget and want to use the title for the text that corresponds with each image. I am able to achieve the images updating correctly but the title remains the same. I have tried config, forgetting and then rebuilding the frame, and I think something else which I can't recall and none of that has worked. I have searched online, reviewed Stack Overflow similar questions--which are very few and lead me to believe that this cannot be done. Thank you for your assistance.
from tkinter import *
from tkinter import Button
from tkinter import Label
from PIL import ImageTk
from PIL import Image
root = Tk()
root.title('')
root.attributes('-toolwindow', True)
root.geometry('620x660+100+0')
img2 = ImageTk.PhotoImage(Image.open('spy_images/rainbow.jpg'))
img4 = ImageTk.PhotoImage(Image.open('spy_images/pods.jpg'))
img5 = ImageTk.PhotoImage(Image.open('spy_images/lion.jpg'))
img6 = ImageTk.PhotoImage(Image.open('spy_images/bike.jpg'))
img7 = ImageTk.PhotoImage(Image.open('spy_images/binary.jpg'))
image_list = [img2, img4, img5, img6, img7]
text2 = 'A rainbow, not in the sky!'
text4 = 'Dangly, weird seed pods.'
text5 = 'A stoney grin.'
text6 = 'A lane just for bikes.'
text7 = 'A different way to count.'
text_list = [text2, text4, text5, text6, text7]
make_frame = LabelFrame(root, text='A rainbow, not in the sky!', width=100, height=100,
font=('Arial', 14, 'bold'), fg='red', bd=10)
make_frame.grid(row=0, column=1, columnspan=5)
img_filename = 'spy_images/rainbow.jpg'
PIL_image = Image.open(img_filename)
img = ImageTk.PhotoImage(PIL_image)
in_frame = Label(make_frame, image=img)
in_frame.grid(padx=10, pady=10)
def forward(image_num, text_num):
global make_frame
global in_frame
global button_forward
global button_back
in_frame.grid_forget()
in_frame = Label(image=image_list[image_num])
button_forward = Button(root, text='>>', command=lambda:
forward(image_num+1, text_num+1))
button_back = Button(root, text='<<', command=lambda:
back(image_num-1, text_num-1))
if image_num == 7:
button_forward = Button(root, text='>>', state=DISABLED)
make_frame.grid(row=0, column=1, columnspan=5)
in_frame.grid(row=0, column=0, columnspan=5)
in_frame.grid(padx=10, pady=10)
button_forward.grid(row=1, column=5)
button_back.grid(row=1, column=1)
button_back.grid_columnconfigure(0, weight=1)
button_back.grid_columnconfigure(2, weight=1)
button_back.grid_columnconfigure(4, weight=1)
def back(image_num, text_num):
global make_frame
global in_frame
global button_forward
global button_back
in_frame.grid_forget()
in_frame = Label(image=image_list[image_num - 1])
button_forward = Button(root, text='>>', command=lambda:
forward(image_num + 1, text_num + 1))
button_back = Button(root, text='<<', command=lambda:
back(image_num - 1, text_num - 1))
if image_num == 1:
button_back = Button(root, text='<<', state=DISABLED)
make_frame.grid(row=0, column=1, columnspan=5)
in_frame.grid(row=0, column=0, columnspan=3)
in_frame.grid(padx=10, pady=10)
button_forward.grid(row=1, column=5)
button_back.grid(row=1, column=1)
button_back.grid_columnconfigure(0, weight=1)
button_back.grid_columnconfigure(2, weight=1)
button_back.grid_columnconfigure(4, weight=1)
button_back = Button(root, text='<<', command=back, state=DISABLED, bg='#d9d5d4',
font=('Arial', 14, 'bold'))
button_exit = Button(root, text='Cancel', command=root.quit, bg='#d9d5d4', font=('Arial', 12))
button_forward = Button(root, text='>>', command=lambda: forward(2, 2), bg='#d9d5d4', font=('Arial', 14, 'bold'))
button_back.grid(row=1, column=1)
button_exit.grid(row=1, column=3)
button_forward.grid(row=1, column=5)
button_back.grid_columnconfigure(0, weight=1)
button_back.grid_columnconfigure(2, weight=1)
button_back.grid_columnconfigure(4, weight=1)
root.mainloop()

If you have some questions about the exampel I'll try to answer you.
import tkinter as tk
#you dont need this but if you want to cycle, wich is would be nice there you go
from itertools import cycle
#create a list with strings you like to display
li = ['A rainbow, not in the sky!','Dangly, weird seed pods.','A stoney grin.',
'A lane just for bikes.','A different way to count.']
#here we create a cycle of that list
my_cycled_li = cycle(li)
#the change function
def change():
#set var to next element in list
var.set(next(my_cycled_li))
#update the LabelFrame
lf.configure(text=var.get())
root = tk.Tk()
#variable to change
var = tk.StringVar()
#there can be a default setting
var.set('default')
lf = tk.LabelFrame(root,text=var.get(),width=200,height=100,bg='red')
#you dont need this, this means the Frame size isnt the size of the widget it contains.
lf.pack_propagate(0)
lf.pack()
b = tk.Button(lf,text='change', command=change)
b.pack()
root.mainloop()
hoped it helps.

Tkinter, alignment - the endless question

Since some days I'll try to align these two items inside a Tkinter frame:
The pink part should be on the left and the green button on the right. With HtmlDivs and CSS a question of seconds, with TKinter a pain in the ...
Here is my python code:
import tkinter as tk
root = tk.Tk()
root.geometry("400x200")
buttons = tk.Frame(root)
buttons.pack(side="top", expand=True, fill='both')
label = tk.Label(buttons, text="Hello, world", anchor='w', background='pink')
b2 = tk.Button(buttons, text="EXIT", background='green')
label.grid(row=0, column=1, sticky='w', ipadx = '20', padx = '20')
b2.grid(row=0, column=3, sticky='e', ipadx = '20', padx = '20')
root.mainloop()
The final app will be running fullscreen on a 7" touch display.

The simplest solution is to use pack instead of grid, since you only have a single row of widgets inside of buttons. pack's strength is arranging things in a single row or a single column.
Just remove these two lines:
label.grid(row=0, column=1, sticky='w', ipadx = '20', padx = '20')
b2.grid(row=0, column=3, sticky='e', ipadx = '20', padx = '20')
... and replace them with this:
label.pack(side='left')
b2.pack(side='right')
Also, since you appear to be creating a toolbar, you want to leave expand as False and set fill to just "x", otherwise the toolbar will expand to fill the entire window:
buttons.pack(side="top", expand=False, fill='x')

Thx for your tips,
this is just a testcode to update my maincode.
Its not good to mix .pack and .grid, right ? If i do, the script crashes completely,
so ill have to re-do my mainscript i think.
This is what i need:
row: 1/2: label (it will be a real time clock) left 2/2: exit button (exit fullscreen) right
row: 1/3: image (weather), 2/3: weather data (label), 3/3: calendar
row: 4 buttons: 1. lightoff 2. light25%, 3.light50% 4.light100&
Thats it basically all is working, it just need to align it (im a coding hero g)
Since i have the frame from the code above, i thought i can easily add 2. & 3. row with another frames, but that does not seem to work ??
Preview:
https://i.stack.imgur.com/KzoqV.png
My (main)Code so far
root = Tk()
root.title('Model Definition')
root.config(background = "deepskyblue4")
root.attributes('-fullscreen',True)
root.bind('<Escape>',lambda e: root.destroy())
def currenttime():
string = strftime("%A, %d.%B.%Y %H:%M:%S")
lbl.config(text = string, background = 'deepskyblue4', fg='white', font=("colibri", 30))
lbl.after(1000, currenttime)
def light400():
FNULL = open(os.devnull, 'w')
subprocess.call(['gpio -g pwm 18 401'], stdout=FNULL, stderr=subprocess.STDOUT, shell=True)
def light425():
FNULL = open(os.devnull, 'w')
subprocess.call(['gpio -g pwm 18 425'], stdout=FNULL, stderr=subprocess.STDOUT, shell=True)
def light450():
FNULL = open(os.devnull, 'w')
subprocess.call(['gpio -g pwm 18 450'], stdout=FNULL, stderr=subprocess.STDOUT, shell=True)
def light475():
FNULL = open(os.devnull, 'w')
subprocess.call(['gpio -g pwm 18 500'], stdout=FNULL, stderr=subprocess.STDOUT, shell=True)
# Main frames
top_frame = Frame(root, bg='deepskyblue4', width=450, height=90, pady=3)
center = Frame(root, bg='deepskyblue2', width=50, height=40, padx=3, pady=3)
btm_frame = Frame(root, bg='deepskyblue4', width=450, height=20, pady=3)
btm_frame2 = Frame(root, bg='deepskyblue4', width=450, height=60, pady=3)
# layout all of the main containers
root.grid_rowconfigure(1, weight=1)
root.grid_columnconfigure(0, weight=1)
top_frame.grid(row=0, sticky="e", padx=(10, 0))
center.grid(row=1, sticky="nsew", pady=(10, 50))
btm_frame.grid(row=3, sticky="ew")
btm_frame2.grid(row=4, sticky="ew", padx=(10, 50))
# create the widgets for the top frame
lbl = Label(top_frame, background = 'deepskyblue4', anchor=W, justify=LEFT)
lbl.pack()
currenttime()
actionbutton = Button(top_frame, text="X", width=5, height=2, bg="deepskyblue4", fg="white", command=root.destroy)
hdr_left = Frame(top_frame, bg='deepskyblue4', width=100, height=190)
hdr_right = Frame(top_frame, bg='deepskyblue4', width=400, height=190, padx=3, pady=3)
# layout the widgets in the top frame
lbl.grid(row=0, column=1, sticky="w")
actionbutton.grid(row=0, column=2, sticky="e")
# create the center widgets
center.grid_rowconfigure(0, weight=1)
center.grid_columnconfigure(1, weight=1)
ctr_left = Frame(center, bg='deepskyblue2', width=100, height=190)
ctr_mid = Frame(center, bg='deepskyblue2', width=150, height=190, padx=3, pady=3)
ctr_right = Frame(center, bg='deepskyblue2', width=400, height=190, padx=3, pady=3)
ctr_left.grid(row=0, column=0, sticky="ns")
ctr_mid.grid(row=0, column=1, sticky="nsew")
ctr_right.grid(row=0, column=2, sticky="ns")
path = "icons/rain.png"
img = ImageTk.PhotoImage(Image.open(path))
panel = Label(ctr_left, image = img, bg="deepskyblue2")
panel.grid(row=0, columnspan=3)
#imgag = panel.pack(top_frame)
#CENTER ctr_mid
if x["cod"] != "404":
y = x["main"]
y2 = x["wind"]
currenttemp = y["temp"]
currentpressure = y["pressure"]
currenthumidiy = y["humidity"]
z = x["weather"]
weather_description = z[0]["description"]
currentwind = y2["speed"]
label1 = Label(ctr_mid,text='Karlsruhe', font = ('calibri', 30), background = 'deepskyblue2')
label2 = Label(ctr_mid,text='Temperatur: '+str(round(currenttemp-272.15))+' °C', font = ('calibri', 20), background = 'deepskyblue2')
label3 = Label(ctr_mid,text='Beschreibung: '+str(weather_description),font = ('calibri', 20), background = 'deepskyblue2')
label4 = Label(ctr_mid,text='Druck: '+str(currentpressure)+' hPa', font = ('calibri', 20), background = 'deepskyblue2')
label5 = Label(ctr_mid,text='Feuchtigkeit: '+str(currenthumidiy)+' %',font = ('calibri', 20), background = 'deepskyblue2')
label6 = Label(ctr_mid,text='Wind: '+str(currentwind)+' m/Sek',font = ('calibri', 20), background = 'deepskyblue2')
label1.grid(row=0, column=0, sticky="nw")
label2.grid(row=1, column=0, sticky="nw")
label3.grid(row=2, column=0, sticky="nw")
label4.grid(row=3, column=0, sticky="nw")
label5.grid(row=4, column=0, sticky="nw")
label6.grid(row=5, column=0, sticky="nw")
# btm_frame2 widgets
licht = Label(btm_frame2, text='Licht:', width=5, height=1, bg="deepskyblue4", fg='white', font=("colibri", 20))
button = Button(btm_frame2, command=light400, text="AUS", width=5, height=1, bg="deepskyblue2", fg="white")
button2 = Button(btm_frame2, text="25 %", command=light425, width=5, height=1, bg="deepskyblue2", fg="white")
button3 = Button(btm_frame2, text="50%", command=light450, width=5, height=1, bg="deepskyblue2", fg="white")
button4 = Button(btm_frame2, text="100%", command=light475, width=5, height=1, bg="deepskyblue2", fg="white")
licht.grid(row=0, column=0, sticky="nw")
button.grid(row=0, column=1, sticky="nw")
button2.grid(row=0, column=2, sticky="nw")
button3.grid(row=0, column=3, sticky="nw")
button4.grid(row=0, column=4, sticky="nw")
actionbutton.grid(row=0, column=6, sticky="nw")
root.mainloop()

How to Make Plot Show up?

So I am trying to create this function to make a plot of a mass spring damper system and we should be able to basically change whatever we like, the values for the function and the sliders should affect the plot as well, i'm having trouble trying to get my function plotted. The error is coming within the function where I am trying to use my solveMBK function inside my PlotWindow function, I am not sure how to include the values from my sliders as well as the other values that are inputted in the start up window. Here is a look at my code:
import tkinter as tk
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)
from matplotlib.figure import Figure
import numpy as np
def solveMBK(inlist):
x0 = inlist[0]
dx0 = inlist[1]
dt = inlist[2]
m = inlist[3]
b = inlist[4]
k = inlist[5]
tf = inlist[6]
Z = inlist[7]
t = np.arange(0,tf,dt)
z0 = np.zeros_like(t)
z1 = np.zeros_like(t)
z0[0] = x0
z1[0] = dx0
for c in range(len(t)-1):
z0[c+1] = z0[c] + z1[c]*dt
z1[c+1] = z1[c] + ((ABradiobutton(Z,t[c]) - k*z0[c] - b*z1[c]) / m)
x = z0
return t,x
def ABradiobutton(Z, t):
if Z == 1:
A = float(A_entry.get())
return A
elif Z == 2:
B = float(B_entry.get())
return np.sin(B*t)
def PlotWindow():
root1 = tk.Tk()
root1.title("Plot")
Mmin = float(Mmin_entry.get())
Mmax = float(Mmax_entry.get())
bmin = float(bmin_entry.get())
bmax = float(bmax_entry.get())
kmin = float(kmin_entry.get())
kmax = float(kmax_entry.get())
mscale = tk.Scale(root1, from_=Mmin, to=Mmax, label="m", bd=2, length=200, orient=tk.HORIZONTAL, command = funcPlot)
mscale.set((Mmin+Mmax)/2)
mscale.grid(row=1, column=0)
bscale = tk.Scale(root1, from_=bmin, to=bmax, label="b", bd=2, length=200, orient=tk.HORIZONTAL, command = funcPlot)
bscale.set((bmin+bmax)/2)
bscale.grid(row=3, column=0)
kscale = tk.Scale(root1, from_=kmin, to=kmax, label="k", bd=2, length=200, orient=tk.HORIZONTAL, command = funcPlot)
kscale.set((kmin+kmax)/2)
kscale.grid(row=5, column=0)
tk.Label(root1, text = " ").grid(row=6, column=0)
tk.Button(root1, text="Back", command=root1.destroy).grid(row=7, column=0)
Graph_Frame = tk.Frame(root1)
Graph_Frame.grid(row=2, column=2, columnspan=10, rowspan=10)
Fig = Figure(figsize=(5.5,4))
a = Fig.add_subplot(111)
if Radio_Var == 1:
t,x = solveMBK(str(mscale.get()), str(bscale.get()), str(kscale.get()), str(A_entry.get()), str(x0_Entry.get()), str(dxdt_Entry.get()), str(tfinal_entry.get()), str(dt_entry.get()))
a.plot(t,x)
# elif Radio_Var == 2:
# t,x = solveMBK()
# a.plot(t,x)
tk.Label(Graph_Frame, text = "Mass-Spring-Damper Plot").pack()
canvas = FigureCanvasTkAgg(Fig, Graph_Frame)
canvas.draw()
canvas.get_tk_widget().pack()
toolbar = NavigationToolbar2Tk(canvas, Graph_Frame)
toolbar.update()
canvas.get_tk_widget().pack()
def CloseWindow():
root.quit()
root.destroy()
exit()
def funcPlot(input_list, mscale, bscale, kscale, a, canvas, event=None):
input_list[0]=float(x0_Entry.get())
input_list[1]=float(dxdt_Entry.get())
input_list[2]=float(dt_entry.get())
input_list[3]=float(mscale.get())
input_list[4]=float(bscale.get())
input_list[5]=float(kscale.get())
input_list[6]=float(tfinal_entry.get())
input_list[7]=float(Radio_Var.get())
data = solveMBK(input_list)
a.plot(data[0], data[1])
canvas.draw()
return
root = tk.Tk()
root.title("Numerical solution of a second order differential equation")
tk.Label(root, text = "Differential Equation:").grid(row=0, column=0, sticky=tk.E)
tk.Label(root, text = "m d2x/dt2 + b dx/dt + kx = f(x)").grid(row=0, column=1)
x0_Start = tk.IntVar()
x0_Start.set("0")
x0_Entry = tk.Entry(root, width=7, textvariable = x0_Start)
tk.Label(root, text = "x(0) = ").grid(row=1, column=0, stick=tk.E), x0_Entry.grid(row=1, column=1, sticky=tk.W)
dxdt_Start = tk.IntVar()
dxdt_Start.set("0")
dxdt_Entry = tk.Entry(root, width=7, textvariable = dxdt_Start)
tk.Label(root, text = "dx(0)/dt= ").grid(row=2, column=0, sticky=tk.E), dxdt_Entry.grid(row=2, column=1, sticky=tk.W)
A_start = tk.IntVar()
A_start.set("1")
A_entry = tk.Entry(root, width=7, textvariable = A_start)
tk.Label(root, text = "A = ").grid(row=6, column=1, sticky=tk.E), A_entry.grid(row=6, column=2, sticky=tk.W)
B_start = tk.IntVar()
B_start.set("0")
B_entry = tk.Entry(root, width=7, textvariable=B_start)
tk.Label(root, text= "B =").grid(row=7,column=1, sticky=tk.E), B_entry.grid(row=7, column=2, sticky=tk.W)
tk.Label(root, text = " ").grid(row=5, column=0, sticky=tk.E)
Radio_Var = tk.IntVar()
tk.Radiobutton(root, text="A", value = 1, variable=Radio_Var).grid(row=6, column=1, sticky = tk.W)
tk.Radiobutton(root, text="sin(Bt)", value = 2, variable=Radio_Var).grid(row=7, column=1, sticky = tk.W)
Radio_Var.set(1)
tk.Label(root, text = "f(x) = ").grid(row=6, column=0, sticky=tk.E)
tk.Label(root, text = " ").grid(row=8, column=0, sticky=tk.E)
tfinal_start = tk.IntVar()
tfinal_start.set("10")
tfinal_entry = tk.Entry(root, width = 7, textvariable=tfinal_start)
tk.Label(root, text = "tfinal = ").grid(row=9, column=0, sticky=tk.E), tfinal_entry.grid(row=9, column=1, sticky=tk.W)
dt_start = tk.IntVar()
dt_start.set("0.001")
dt_entry = tk.Entry(root, width = 7, textvariable=dt_start)
tk.Label(root, text = "dt = ").grid(row=9, column=1, sticky=tk.E), dt_entry.grid(row=9, column=2, sticky=tk.W)
tk.Label(root, text = " ").grid(row=10, column=0, sticky=tk.E)
Mmin_start = tk.IntVar()
Mmin_start.set("1")
Mmin_entry = tk.Entry(root, width=7, textvariable=Mmin_start)
tk.Label(root, text = "Mmin = ").grid(row=11, column=0, sticky=tk.E), Mmin_entry.grid(row=11, column=1, sticky=tk.W)
Mmax_start = tk.IntVar()
Mmax_start.set("100")
Mmax_entry = tk.Entry(root, width=7, textvariable=Mmax_start)
tk.Label(root, text = "Mmax = ").grid(row=11,column=1, sticky=tk.E), Mmax_entry.grid(row=11, column=2, sticky=tk.W)
bmin_start = tk.IntVar()
bmin_start.set("1")
bmin_entry = tk.Entry(root, width=7, textvariable=bmin_start)
tk.Label(root, text = "bmin = ").grid(row=12, column=0, sticky=tk.E), bmin_entry.grid(row=12, column=1, sticky=tk.W)
bmax_start = tk.IntVar()
bmax_start.set("250")
bmax_entry = tk.Entry(root, width=7, textvariable=bmax_start)
tk.Label(root, text= "bmax = ").grid(row=12, column=1, sticky=tk.E), bmax_entry.grid(row=12,column=2,sticky=tk.W)
kmin_start = tk.IntVar()
kmin_start.set("1")
kmin_entry = tk.Entry(root, width=7, textvariable=kmin_start)
tk.Label(root, text= "kmin = ").grid(row=13, column=0, sticky=tk.E), kmin_entry.grid(row=13, column=1, sticky=tk.W)
kmax_start = tk.IntVar()
kmax_start.set("500")
kmax_entry = tk.Entry(root, width=7, textvariable=kmax_start)
tk.Label(root, text="kmax = ").grid(row=13, column=1, sticky=tk.E), kmax_entry.grid(row=13, column=2, sticky=tk.W)
tk.Button(root, text = "Quit", command=CloseWindow, width=10).grid(row=14, column=0)
tk.Button(root, text= "Plot", command=PlotWindow, width=10).grid(row=14, column=3)
root.mainloop()
Any help would be appreciated, thank you!

You're passing funcPlot as the command for Scale to call:
mscale = tk.Scale(root1, ..., command=funcPlot)
According to the documentation, command is:
A procedure to be called every time the slider is moved. This
procedure will be passed one argument, the new scale value.
But instead of taking one argument, your funcPlot() function requires six arguments:
def funcPlot(input_list, mscale, bscale, kscale, a, canvas, event=None):
Which leads to the error:
TypeError: funcPlot() missing 5 required positional arguments: 'mscale', 'bscale', 'kscale', 'a', and 'canvas'
You need to rethink how this is supposed to work. Below is my rework of your code. I got around the problem above by using global variables -- I'm not proud of that. I also had to rework the way your plot gets embedded in Tk as what you had wasn't working:
import tkinter as tk
import numpy as np
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)
from matplotlib.figure import Figure
def solveMBK(inlist):
x0, dx0, dt, m, b, k, tf, Z = inlist
t = np.arange(0, tf, dt)
z0 = np.zeros_like(t)
z1 = np.zeros_like(t)
z0[0] = x0
z1[0] = dx0
for c in range(len(t) - 1):
z0[c + 1] = z0[c] + z1[c] * dt
z1[c + 1] = z1[c] + ((ABradiobutton(Z, t[c]) - k * z0[c] - b * z1[c]) / m)
return t, z0
def ABradiobutton(Z, t):
if Z == 1:
A = float(A_entry.get())
return A
if Z == 2:
B = float(B_entry.get())
return np.sin(B * t)
def PlotWindow():
global mscale, bscale, kscale, subplot, figure_canvas
plot_window = tk.Toplevel(root)
plot_window.title("Plot")
Mmin = float(Mmin_entry.get())
Mmax = float(Mmax_entry.get())
bmin = float(bmin_entry.get())
bmax = float(bmax_entry.get())
kmin = float(kmin_entry.get())
kmax = float(kmax_entry.get())
mscale = tk.Scale(plot_window, from_=Mmin, to=Mmax, label="m", bd=2, length=200, orient=tk.HORIZONTAL, command=funcPlot)
mscale.set((Mmin + Mmax) / 2)
mscale.grid(row=1, column=0)
bscale = tk.Scale(plot_window, from_=bmin, to=bmax, label="b", bd=2, length=200, orient=tk.HORIZONTAL, command=funcPlot)
bscale.set((bmin + bmax) / 2)
bscale.grid(row=3, column=0)
kscale = tk.Scale(plot_window, from_=kmin, to=kmax, label="k", bd=2, length=200, orient=tk.HORIZONTAL, command=funcPlot)
kscale.set((kmin + kmax) / 2)
kscale.grid(row=5, column=0)
tk.Label(plot_window, text=" ").grid(row=6, column=0)
tk.Button(plot_window, text="Back", command=plot_window.destroy).grid(row=7, column=0)
graph_frame = tk.Frame(plot_window)
graph_frame.grid(row=2, column=2, columnspan=10, rowspan=10)
figure = Figure(figsize=(5.5, 4))
subplot = figure.add_subplot(111)
if Radio_Var.get() == 1:
t, x = solveMBK([float(mscale.get()), float(bscale.get()), float(kscale.get()), float(A_entry.get()), float(x0_Entry.get()), float(dxdt_Entry.get()), float(tfinal_entry.get()), float(dt_entry.get())])
subplot.plot(t, x)
# elif Radio_Var.get() == 2:
# t, x = solveMBK()
# subplot.plot(t, x)
figure_canvas = FigureCanvasTkAgg(figure, master=graph_frame)
figure_canvas.draw()
figure_canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
toolbar = NavigationToolbar2Tk(figure_canvas, graph_frame)
toolbar.update()
figure_canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
tk.Label(graph_frame, text="Mass-Spring-Damper Plot").pack()
def CloseWindow():
root.quit()
root.destroy()
exit()
def funcPlot(event):
input_list = []
input_list.append(float(x0_Entry.get()))
input_list.append(float(dxdt_Entry.get()))
input_list.append(float(dt_entry.get()))
input_list.append(float(mscale.get()))
input_list.append(float(bscale.get()))
input_list.append(float(kscale.get()))
input_list.append(float(tfinal_entry.get()))
input_list.append(float(Radio_Var.get()))
t, x = solveMBK(input_list)
subplot.plot(t, x)
figure_canvas.draw()
figure_canvas = subplot = mscale = bscale = kscale = None
root = tk.Tk()
root.title("Numerical solution of a second order differential equation")
tk.Label(root, text="Differential Equation:").grid(row=0, column=0, sticky=tk.E)
tk.Label(root, text="m d2x/dt2 + b dx/dt + kx = f(x)").grid(row=0, column=1)
tk.Label(root, text="x(0) = ").grid(row=1, column=0, stick=tk.E)
x0_Start = tk.IntVar()
x0_Start.set("0")
x0_Entry = tk.Entry(root, width=7, textvariable=x0_Start)
x0_Entry.grid(row=1, column=1, sticky=tk.W)
tk.Label(root, text="dx(0)/dt = ").grid(row=2, column=0, sticky=tk.E)
dxdt_Start = tk.IntVar()
dxdt_Start.set("0")
dxdt_Entry = tk.Entry(root, width=7, textvariable=dxdt_Start)
dxdt_Entry.grid(row=2, column=1, sticky=tk.W)
tk.Label(root, text=" ").grid(row=5, column=0, sticky=tk.E)
Radio_Var = tk.IntVar()
Radio_Var.set(1)
tk.Label(root, text="f(x) = ").grid(row=6, column=0, sticky=tk.E)
tk.Radiobutton(root, text="A", value=1, variable=Radio_Var).grid(row=6, column=1, sticky=tk.W)
tk.Label(root, text="A = ").grid(row=6, column=1, sticky=tk.E)
A_start = tk.IntVar()
A_start.set("1")
A_entry = tk.Entry(root, width=7, textvariable=A_start)
A_entry.grid(row=6, column=2, sticky=tk.W)
tk.Radiobutton(root, text="sin(Bt)", value=2, variable=Radio_Var).grid(row=7, column=1, sticky=tk.W)
tk.Label(root, text="B =").grid(row=7, column=1, sticky=tk.E)
B_start = tk.IntVar()
B_start.set("0")
B_entry = tk.Entry(root, width=7, textvariable=B_start)
B_entry.grid(row=7, column=2, sticky=tk.W)
tk.Label(root, text=" ").grid(row=8, column=0, sticky=tk.E)
tk.Label(root, text="tfinal = ").grid(row=9, column=0, sticky=tk.E)
tfinal_start = tk.IntVar()
tfinal_start.set("10")
tfinal_entry = tk.Entry(root, width=7, textvariable=tfinal_start)
tfinal_entry.grid(row=9, column=1, sticky=tk.W)
tk.Label(root, text="dt = ").grid(row=9, column=1, sticky=tk.E)
dt_start = tk.IntVar()
dt_start.set("0.001")
dt_entry = tk.Entry(root, width=7, textvariable=dt_start)
dt_entry.grid(row=9, column=2, sticky=tk.W)
tk.Label(root, text=" ").grid(row=10, column=0, sticky=tk.E)
tk.Label(root, text="Mmin = ").grid(row=11, column=0, sticky=tk.E)
Mmin_start = tk.IntVar()
Mmin_start.set("1")
Mmin_entry = tk.Entry(root, width=7, textvariable=Mmin_start)
Mmin_entry.grid(row=11, column=1, sticky=tk.W)
tk.Label(root, text="Mmax = ").grid(row=11, column=1, sticky=tk.E)
Mmax_start = tk.IntVar()
Mmax_start.set("100")
Mmax_entry = tk.Entry(root, width=7, textvariable=Mmax_start)
Mmax_entry.grid(row=11, column=2, sticky=tk.W)
tk.Label(root, text="bmin = ").grid(row=12, column=0, sticky=tk.E)
bmin_start = tk.IntVar()
bmin_start.set("1")
bmin_entry = tk.Entry(root, width=7, textvariable=bmin_start)
bmin_entry.grid(row=12, column=1, sticky=tk.W)
tk.Label(root, text="bmax = ").grid(row=12, column=1, sticky=tk.E)
bmax_start = tk.IntVar()
bmax_start.set("250")
bmax_entry = tk.Entry(root, width=7, textvariable=bmax_start)
bmax_entry.grid(row=12, column=2, sticky=tk.W)
tk.Label(root, text="kmin = ").grid(row=13, column=0, sticky=tk.E)
kmin_start = tk.IntVar()
kmin_start.set("1")
kmin_entry = tk.Entry(root, width=7, textvariable=kmin_start)
kmin_entry.grid(row=13, column=1, sticky=tk.W)
tk.Label(root, text="kmax = ").grid(row=13, column=1, sticky=tk.E)
kmax_start = tk.IntVar()
kmax_start.set("500")
kmax_entry = tk.Entry(root, width=7, textvariable=kmax_start)
kmax_entry.grid(row=13, column=2, sticky=tk.W)
tk.Button(root, text="Quit", command=CloseWindow, width=10).grid(row=14, column=0)
tk.Button(root, text="Plot", command=PlotWindow, width=10).grid(row=14, column=3)
root.mainloop()

Using StringVar data as a list

I've been following this website for a while. It is really helpful. So, thanks for all the useful tips.
I've been searching for this answer for the past two weeks without any success, so now I'm compelled to ask out of total frustration with my current obstacle.
How do you use StringVar as a list?
Basically, I was coding the following program for my wife. The code is pretty messy as it is my first program I've tried to code.
The idea was that I would take 3 variables; password, secret number and website and then do some work on them using if statements and lists to create a unique password.
First problem was that I couldn't restrict the character length of the entry widgets but in the end i solved that but i still want to limit the characters that can be input.
for instance in the website entry box, i want to allow only letters.
If I could convert StringVar to a list, I could do some work with messy if statements to allow only certain characters in each index but everythime i try it says that stringvars cant be used as a list.
I need them as a list to limit the type of characters that can be entered and also so that i can do work on the variables to get the final output.
CODE:
from Tkinter import *
import Tkinter
from PIL import Image, ImageTk
import os
Title= ("Helvetica", 20, "bold", "underline")
Heading= ("Courier", 20, "bold")
Body= ("Courier", 15)
Body1= ("Courier", 15, "bold")
notice= ("Courier", 10)
Body2= ("Courier", 15, "bold", "underline")
root = Tk()
root.title("Koala Series: Encrypter")
root.configure(background="#ffefd5")
root.geometry('{}x{}'.format(510, 600))
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1) # not needed, this is the default behavior
root.rowconfigure(1, weight=1)
root.rowconfigure(2, weight=1)
website = StringVar()
Titlemsg = Label(root, text="Koala Encrypter", font=Title, bg="#00FA9A", relief=RAISED,)
Titlemsg.grid( row=7, pady=25, sticky=N+S+E+W)
img1 = ImageTk.PhotoImage(Image.open("koala.jpeg"))
startpic = Label(root, image = img1, relief=RIDGE )
startpic.grid( row=10,pady=25, )
Head = Label(root,anchor=CENTER,text="Welcome to the Koala Encrypter \n\n A Koala series tool that allows you\n\n to Encrypt your passwords \n\n Click \'Start Encrypting\' to continue \n\n", font=Body, bg="#ffefd5", relief=RAISED,)
Head.grid( row=14, pady=25, columnspan=2, sticky=N+S+E+W)
web = Label(root, text="WEBSITE: ", font=Body, bg="#ffefd5", justify=CENTER,)
#website.set("Enter your website here")
entry = Entry(root,textvariable=website , justify=CENTER,relief=SUNKEN,cursor="pencil", takefocus=True )
Notice1 = Label( text="Please only insert the first 5 letters of the website!!",font=notice, bg="#ffefd5", fg="#0000ff",)
passw = Label(root, text="PASSWORD: ", font=Body, bg="#ffefd5", justify=CENTER)
passwordvar= StringVar()
entry1 = Entry(root, textvariable= passwordvar, justify=CENTER,relief=SUNKEN, cursor="pencil", takefocus=True )
Notice= Label(root, text="Your password must only be 5 characters long!!", font=notice, bg="#ffefd5", fg="#0000ff", justify=CENTER)
def callback(event):
if "<0>":
top = Toplevel(bg="#ffefd5")
top.title("Koala Encrypter")
popuptitle = Label(top, text="Your secret number must be between 1 and 9:", font=Body1, fg="red", bg="#ffefd5")
popuptitle.grid(row = 2,column=0, padx=5, pady = 50,sticky=N+S+E+W)
secret = Label(root, text="SECRET NUMBER: ", font=Body, bg="#ffefd5" , justify=CENTER,)
numbervar = StringVar()
entry2 = Entry(root, textvariable=numbervar , justify=CENTER,relief=SUNKEN,cursor="pencil", takefocus=True)
entry2.bind("<0>", callback)
Notice2 = Label(root, text="your secret number must be between 1 and 9!!!", font=notice, bg="#ffefd5", fg="#0000ff", justify=CENTER)
img = ImageTk.PhotoImage(Image.open("Koalalogo.jpg"))
panel = Label(root, image = img, relief=SUNKEN)
correct= Label(root, text="Check the below details \n\n Click \'yes\' if they are correct \n\n Click \'No\' to go back \n\n", font=Body1, bg="#ffefd5")
yourwebsite = Label(root, text="The Website is :", font=Body, bg="#ffefd5")#
website1 = Label(root, font=Body2, bg="#ffefd5",fg= "#00009C", textvariable = website)#
yourpassword = Label(root, text="Your Password is:", font=Body, bg="#ffefd5")
yournumber1= Label(root, font=Body2, bg="#ffefd5",textvariable = numbervar , fg= "#00009C", )
yourpassword1 = Label(root, font=Body2, bg="#ffefd5",textvariable = passwordvar , fg= "#00009C", )
yournumber= Label(root, text="Your Secret Number is:", font=Body, bg="#ffefd5")
def restart():
Titlemsg.grid_forget()
correct.grid_forget()
yourwebsite.grid_forget()
website1.grid_forget()
yourpassword.grid_forget()
yourpassword1.grid_forget()
yournumber.grid_forget()
yournumber1.grid_forget()
panel.grid_forget()
toolbar.grid_forget()
yes.grid_forget()
no.grid_forget()
entry.delete(0,END)
entry1.delete(0,END)
entry2.delete(0,END)
Titlemsg.grid( row=7, pady=25, sticky=N+S+E+W)
startpic.grid( row=10,pady=25, )
Head.grid( row=14, pady=25, columnspan=2, sticky=N+S+E+W)
toolbar.grid( row=21, )
end.grid(column =3, row=1, sticky=N+S+E+W)
begin.grid(column =2, row=1, sticky=N+S+E+W)
def start():
#entry.destroy()
#entry1.destroy()
#entry2.destroy()
toolbar.grid_forget()
Titlemsg.grid_forget()
begin.grid_forget()
Head.grid_forget()
startpic.grid_forget()
web.grid(row=3, column=0, sticky= W+E)
entry.grid( row=3, column=1, padx=50)
passw.grid(row=10, column=0)
Notice1.grid(row=4, sticky=N+S+E+W, columnspan=2)
entry1.grid(row=10, column=1)
Notice.grid(row=11,column=0, columnspan=2,)
secret.grid(row=13, column=0)
entry2.grid( row=13, column=1)
Notice2.grid( row=14,column=0, columnspan=2,)
panel.grid(row=20,columnspan=2, pady=70)
confirm.grid(column =1, row=1)
reset.grid(column =2, row=1)
end.grid(column =3, row=1)
toolbar.grid(row=21, column=0, columnspan=2)
Titlemsg.grid(row=0, column=0, columnspan=2, sticky=E+W)
def Reset():
entry.delete(0,END)
entry1.delete(0,END)
entry2.delete(0,END)
def clear_text():
#entry.destroy()
#entry1.destroy()
#entry2.destroy()
panel.grid_forget()
entry.grid_forget()
entry1.grid_forget()
entry2.grid_forget()
web.grid_forget()
Notice.grid_forget()
passw.grid_forget()
secret.grid_forget()
Notice1.grid_forget()
Notice2.grid_forget()
confirm.grid_forget()
reset.grid_forget()
toolbar.grid_forget()
Titlemsg.grid_forget()
Titlemsg.grid(row=0, column=0, columnspan=2, sticky=E+W)
correct.grid(row=1, column=0, columnspan=2, sticky=E+W)
yourwebsite.grid(row=2,column=0,sticky=E+W, pady=5)
website1.grid(row=2, column=1, padx=65,sticky=E+W, pady=5)
yourpassword.grid(row=4, column=0,sticky=E+W, pady=5)
yourpassword1.grid(row=4, column=1, padx=65,sticky=E+W, pady=5)
yournumber.grid(row=6, column=0,sticky=E+W, pady=5)
yournumber1.grid(row=6, column=1, padx=65,sticky=E+W, pady=5)
panel.grid(row=8, column=0, columnspan=2, pady=50)
toolbar.grid(row=10, column=0, columnspan=2)
yes.grid(column =1, row=1)
no.grid(column =2, row=1)
def popup():
top = Toplevel(bg="#ffefd5")
top.title("Koala Encrypter")
popuptitle = Label(top, text="Your password is:", font=Body1, fg="red", bg="#ffefd5")
popuptitle.grid(row = 2,column=0, padx=5, pady = 50,sticky=N+S+E+W)
pwd= Label(top, font=Body2, text="password", bg="#ffefd5", fg= "#00009C", ) #textvariable = newpassword ,
pwd.grid(row= 2, column=1,sticky=E+W,padx=15)
button = Button(top, text="OK", command=top.destroy, relief=RAISED )
button.grid(column =0,columnspan=2, row=4, sticky=N+S+E+W)
def helpmsg():
top = Toplevel(bg="#ffefd5")
top.title("Koala Encrypter")
popuptitle = Label(top, text="Koala series 1.0 - Koala Encrypter", font=Title, bg="#00FA9A", relief=RAISED,)
popuptitle.grid(row = 2,column=0, padx=5, pady = 50,sticky=N+S+E+W)
pwd= Label(top, font=Body, text="Free software to help you keep your acounts safe", bg="#ffefd5")
pwd.grid(row= 1,sticky=E+W,)
Titlems = Label(top, text="Koala Encrypter", font=Title, bg="#00FA9A", relief=RAISED,)
Titlems.grid( row=0, pady=25, sticky=N+S+E+W)
button = Button(top, text="OK", command=top.destroy, relief=RAISED )
button.grid(column =0,columnspan=2, row=4, sticky=N+S+E+W)
max_len = 5
def on_write(*args):
s = website.get()
if len(s) > max_len:
website.set(s[:max_len])
website.trace_variable("w", on_write)
max_len1 = 5
def on_write(*args):
s = passwordvar.get()
if len(s) > max_len1:
passwordvar.set(s[:max_len1])
passwordvar.trace_variable("w", on_write)
max_len2 = 1
def on_write(*args):
s = numbervar.get()
if len(s) > max_len2:
numbervar.set(s[:max_len2])
numbervar.trace_variable("w", on_write)
toolbar = Frame(root)
reset = Button(toolbar, text="Reset", width=6, command=Reset, cursor="cross", relief=RAISED, takefocus=True )
end = Button(toolbar, text="Quit" ,command=root.destroy, relief=RAISED, cursor="X_cursor", takefocus=True)
end.grid(column =3, row=1, sticky=N+S+E+W)
begin = Button(toolbar, text="Start Encrypting", command=start, relief=RAISED, cursor="star",takefocus=True )
begin.grid(column =2, row=1, sticky=N+S+E+W)
confirm = Button(toolbar, text="Next", command =clear_text, cursor="star", relief=RAISED,takefocus=True )
yes = Button(toolbar, text="Yes", command =popup, cursor="star", relief=RAISED,takefocus=True )
no = Button(toolbar, text="No", command =restart, cursor="pirate", relief=RAISED, takefocus=True )
toolbar.grid( row=21, )
menu = Menu(root)
root.config(menu=menu)
filemenu = Menu(menu)
menu.add_cascade(label="File", menu=filemenu)
filemenu.add_command(label="Restart", command=restart)
filemenu.add_separator()
filemenu.add_command(label="Exit", command=root.destroy)
helpmenu = Menu(menu)
menu.add_cascade(label="Help", menu=helpmenu, )
helpmenu.add_command(label="About...", command=helpmsg)
app = root
root.mainloop()
# add functionality, fix validation

To restrict the type/number of characters that can be typed into an entry widget, you can use the entry validatecommand. Here is an example to allow only letters and another one to restrict the entry to 4 digits:
from tkinter import Tk, Entry, Label
def only_letters(action, char):
if action == "1":
# a character is inserted (deletion is 0) allow the insertion
# only if the inserted character char is a letter
return char.isalpha()
else:
# allow deletion
return True
def only_numbers_max_4(action, new_text):
if action == "1":
return new_text.isdigit() and len(new_text) <= 4
else:
return True
root = Tk()
# register validate commands
validate_letter = root.register(only_letters)
validate_nb = root.register(only_numbers_max_4)
Label(root, text="Only letters: ").grid(row=0, column=0)
e1 = Entry(root, validate="key", validatecommand=(validate_letter, '%d', '%S'))
# %d is the action code and %S the inserted/deleted character
e1.grid(row=0, column=1)
Label(root, text="Only numbers, at most 4: ").grid(row=1, column=0)
e2 = Entry(root, validate="key", validatecommand=(validate_nb, '%d', '%P'))
# %P is the new content of the entry after the modification
e2.grid(row=1, column=1)
root.mainloop()
For more details on entry validation, see http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/entry-validation.html

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