Develop Reference

Tkinter cannot draw to another window

I want to do something that should be rather simple, but I'm struggling to make it work.
Basically I have 2 Tkinter windows (canvas_tk and control_tk).
In canvas_tk I want to show an image and draw a circle on top of it.
In control_tk I have an Entry to input the radius of the circle to be drawn.
In my code the critical line is at the very bottom of the code:
self.panel = tk.Label(canvas_tk, image=image)
If I make the label in the control_tk or if I dont specify the parent, it actually works fine and draws the circles in the control_tk window
However I want the circles to be drawn in the canvas_tk window
self.panel = tk.Label(image=image) # Works
self.panel = tk.Label(control_tk, image=image) # Works
self.panel = tk.Label(canvas_tk, image=image) # Fails
Here's my minimal code:
import tkinter as tk
from PIL import Image, ImageTk, ImageDraw
control_tk = tk.Tk()
canvas_tk = tk.Tk()
control_tk.geometry("300x300")
canvas_tk.geometry("900x900")
class Drawing:
def __init__(self):
# Numerical entry with a variable traced with callback to "on_change" function
self.radius_var = tk.IntVar()
self.radius_var.trace_variable("w", self.on_change)
tk.Entry(control_tk, textvariable=self.radius_var).grid()
# Initialize image and panel
self.image = Image.new('RGB', (1000, 1000))
self.panel = None
# mainloop for the two tkinter windows
control_tk.mainloop()
canvas_tk.mainloop()
def on_change(self, *args):
print("Value changed") # to check that function is being called
draw = ImageDraw.Draw(self.image)
draw.ellipse((50-self.radius_var.get(), 50-self.radius_var.get(),
50+self.radius_var.get(), 50+self.radius_var.get()),
outline='blue', width=3)
image = ImageTk.PhotoImage(self.image)
if self.panel: # update the image
self.panel.configure(image=image)
self.panel.image = image
else: # if it's the first time initialize the panel
self.panel = tk.Label(canvas_tk, image=image)
self.panel.image = image
self.panel.grid(sticky="w")
Drawing()
And the traceback error basically complains about image not existing
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\lab\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 508, in get
return self._tk.getint(value)
_tkinter.TclError: expected integer but got ""
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\lab\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 1705, in __call__
return self.func(*args)
File "C:/GIT/142-277-00_pyScuti2/test.py", line 29, in on_change
draw.ellipse((50-self.radius_var.get(), 50-self.radius_var.get(),
File "C:\Users\lab\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 510, in get
return int(self._tk.getdouble(value))
_tkinter.TclError: expected floating-point number but got ""
Value changed
Value changed
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\lab\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 1705, in __call__
return self.func(*args)
File "C:/GIT/142-277-00_pyScuti2/test.py", line 38, in on_change
self.panel = tk.Label(canvas_tk, image=image)
File "C:\Users\lab\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 2766, in __init__
Widget.__init__(self, master, 'label', cnf, kw)
File "C:\Users\lab\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 2299, in __init__
(widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: image "pyimage1" doesn't exist

First of all, you should not use multiple Tk() instances. Second, you better not using trace() on tracking input change, use bind('<Return>', ...) to trigger drawing after user enters value and press Enter key. Below is a modified code based on yours:
import tkinter as tk
from PIL import Image, ImageTk, ImageDraw
control_tk = tk.Tk()
control_tk.geometry("300x300+800+600")
canvas_tk = tk.Toplevel() # use Toplevel instead of Tk
canvas_tk.geometry("900x900+10+10")
class Drawing:
def __init__(self):
# Numerical entry with a variable traced with callback to "on_change" function
self.radius_var = tk.IntVar()
entry = tk.Entry(control_tk, textvariable=self.radius_var)
entry.grid()
# binding Enter key on entry to trigger the drawing
entry.bind('<Return>', self.on_change)
# Initialize image and panel
self.image = Image.new('RGB', (1000, 1000))
self.panel = None
# mainloop for the main window
control_tk.mainloop()
def on_change(self, *args):
try:
radius = self.radius_var.get()
except:
print('Invalid number')
return
print("Value changed") # to check that function is being called
draw = ImageDraw.Draw(self.image)
draw.ellipse((50-radius, 50-radius, 50+radius, 50+radius),
outline='blue', width=3)
image = ImageTk.PhotoImage(self.image)
if self.panel:
self.panel.configure(image=image)
else:
self.panel = tk.Label(canvas_tk, image=image)
self.panel.grid(sticky='w')
self.panel.image = image
Drawing()

_tkinter.TclError: can't pack when trying to add ttkcalendar into tkinter GUI

I'm trying to add a ttk calendar into my Tkinter GUI. The problem is that it raises _tkinter.TclError: can't pack .34164128 inside .34161248.34161448.34161608
import Tkinter
import tkSimpleDialog
import ttkcalendar
class CalendarDialog(tkSimpleDialog.Dialog):
"""Dialog box that displays a calendar and returns the selected date"""
def body(self, master):
self.calendar = ttkcalendar.Calendar(master)
self.calendar.pack()
def apply(self):
self.result = self.calendar.selection
# Demo code:
def main():
root = Tkinter.Tk()
root.wm_title("CalendarDialog Demo")
def onclick():
print 'click'
cd = CalendarDialog(root)
button = Tkinter.Button(root, text="Click me to see a calendar!", command=onclick)
button.pack()
root.update()
root.mainloop()
if __name__ == "__main__":
main()
TRACEBACK:
File "C:/Users/Milano/PycharmProjects/MC/plots/ds.py", line 32, in <module>
main()
File "C:/Users/Milano/PycharmProjects/MC/plots/ds.py", line 23, in main
cd = CalendarDialog(root)
File "C:\Python27\lib\lib-tk\tkSimpleDialog.py", line 64, in __init__
self.initial_focus = self.body(body)
File "C:/Users/Milano/PycharmProjects/MC/plots/ds.py", line 9, in body
self.calendar = ttkcalendar.Calendar(master)
File "C:\Users\Milano\PycharmProjects\MC\plots\ttkcalendar.py", line 52, in __init__
self.__place_widgets() # pack/grid used widgets
File "C:\Users\Milano\PycharmProjects\MC\plots\ttkcalendar.py", line 110, in __place_widgets
self._calendar.pack(in_=self, expand=1, fill='both', side='bottom')
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1940, in pack_configure
+ self._options(cnf, kw))
_tkinter.TclError: can't pack .34164128 inside .34161248.34161448.34161608
Do you know where is the problem?

The fault is that you don't have an __init__ method in the class CalendarDialog. So just rename the body method to __init__. Now you have initialized the instance every time one is made and a pack() method is defined.

I also encountered this problem putting a ttkCalendar into a Dialog box.
I suspect the author of this post "borrowed" the same code for building a calendar as I did:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=2ahUKEwiWgYWKsJ3nAhVKl3IEHYrhCU8QFjABegQICBAB&url=https%3A%2F%2Fsvn.python.org%2Fprojects%2Fpython%2Ftrunk%2FDemo%2Ftkinter%2Fttk%2Fttkcalendar.py&usg=AOvVaw0ifTox4EI7CtBFWlRYD_m9
There are two problems I found using this code to create a Calendar object and placing it into a Dialog box.
The first one causes the traceback as shown in the post. The fix is to modify the ttkcalendar.py file to pack the calendar when it is created, not after it is created using the pack() function.
Here is the diff:
102c102
< self._calendar = ttk.Treeview(show='', selectmode='none', height=7)
---
> self._calendar = ttk.Treeview(self, show='', selectmode='none', height=7)
109c109
< self._calendar.pack(in_=self, expand=1, fill='both', side='bottom')
---
> self._calendar.pack(expand=1, fill='both', side='bottom')
Once you make this change, the calendar will appear in the dialog box. However, your problems are not yet done. Another exception occurs when trying to set the minimum size of the calendar:
Exception in Tkinter callback
Traceback (most recent call last):
File "/home/richawil/Applications/anaconda3/envs/TLM/lib/python3.7/tkinter/__init__.py", line 1705, in __call__
return self.func(*args)
File "/home/richawil/Documents/Programming/Apps/TLM/TLM/ttkcalendar.py", line 134, in __minsize
width, height = self._calendar.master.geometry().split('x')
AttributeError: 'Calendar' object has no attribute 'geometry'
I have not been able to fix this issue other than to comment out the call to self.__minsize.
63c62,63
< self._calendar.bind('<Map>', self.__minsize)
---
> # Commented out because _calendar object does not support geometry() function
> #self._calendar.bind('<Map>', self.__minsize)

TclError: unknown option "0.0": must be moveto or scroll

My program consists in mouse drawing: Simultaneous reproduction of the drawn curves are done on a toplevel window. My aim is to set the vertical and horizontal scroll bars to the toplevel window.
The drawing works as I expected except I am not seeing the scrollbars as well as I am getting this error (which does not stop the program, however):
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1489, in __call__
return self.func(*args)
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1523, in yview
res = self.tk.call(self._w, 'yview', *args)
TclError: unknown option "0.0": must be moveto or scroll
The program consists of these lines:
from Tkinter import *
import numpy as np
import cv2
import Image, ImageTk
class Test:
def __init__(self, parent):
self.parent = parent
self.b1="up"
self.xold=None
self.yold=None
self.liste=[]
self.top = TopLevelWindow()
self.s=400,400,3
self.im=np.zeros(self.s,dtype=np.uint8)
cv2.imshow("hello",self.im)
def test(self):
self.drawingArea=Canvas(self.parent,width=400,height=400)
self.drawingArea.pack()
self.drawingArea.bind("<Motion>",self.motion)
self.drawingArea.bind("<ButtonPress-1>",self.b1down)
self.drawingArea.bind("<ButtonRelease-1>",self.b1up)
def b1down(self,event):
self.b1="down"
def b1up(self,event):
self.b1="up"
self.xold=None
self.yold=None
self.liste.append((self.xold,self.yold))
def motion(self,event):
if self.b1=="down":
if self.xold is not None and self.yold is not None:
event.widget.create_line(self.xold,self.yold,event.x,event.y,fill="red",width=3,smooth=TRUE)
self.top.draw_line(self.xold,self.yold,event.x,event.y)
self.xold=event.x
self.yold=event.y
self.liste.append((self.xold,self.yold))
class TopLevelWindow(Frame):
def __init__(self):
Frame.__init__(self)
self.top=Toplevel()
self.top.wm_title("Second Window")
self.canvas=Canvas(self.top,width=400,height=400)
self.canvas.grid(row=0,column=0,sticky=N+E+S+W)
self.sbarv=Scrollbar(self,orient=VERTICAL)
self.sbarh=Scrollbar(self,orient=HORIZONTAL)
self.sbarv.config(command=self.canvas.yview)
self.sbarh.config(command=self.canvas.xview)
self.canvas.config(yscrollcommand=self.canvas.yview)
self.canvas.config(xscrollcommand=self.canvas.xview)
self.sbarv.grid(row=0,column=1,sticky=N+S)
self.sbarh.grid(row=1,column=0,sticky=W+E)
self.canvas.config(scrollregion=(0,0,400,400))
def draw_line(self, xold, yold, x, y):
self.canvas.create_line(xold,yold,x,y,fill="blue",width=3,smooth=TRUE)
if __name__=="__main__":
root = Tk()
root.wm_title("Main Window")
v = Test(root)
v.test()
root.mainloop()

These lines are incorrect:
self.canvas.config(yscrollcommand=self.canvas.yview)
self.canvas.config(xscrollcommand=self.canvas.xview)
You're telling the canvas to scroll the canvas when the canvas scrolls. The yscrollcommand and xscrollcommand options typically need to call the set method of a scrollbar:
self.canvas.config(yscrollcommand=self.sbarv.set)
self.canvas.config(xscrollcommand=self.sbarh.set)

I want to share the solution I found in case someone in the future encounters this problem:
I only had encrust the two scrollbars into the same parent widget as the canvas itself. I mean:
self.sbarv=Scrollbar(self.top,orient=VERTICAL)
self.sbarh=Scrollbar(self.top,orient=HORIZONTAL)

AttributeError when trying to use tkFont

When I run this code:
from Tkinter import *
import tkFont
class Statify():
def __init__(self):
### Broken
self.titleFont = tkFont.Font(family='Helvetica', size=24, weight='bold')
self.option_add(*Label*font, self.titleFont)
###
self.root = Tk()
self.root.withdraw()
self.main = Toplevel(self.root)
self.main.title('')
self.main_header = Frame(self.main)
self.main_footer = Frame(self.main)
self.main_title = Label(self.main_header, text='Statify Me v1.0 (WIP)')
self.main_exit = Button(self.main_footer, text='Quit', command=quit)
self.main_header.pack()
self.main_footer.pack()
self.main_title.pack()
self.main_exit.pack()
mainloop()
statify = Statify()
I get:
Traceback (most recent call last):
File "Statify.py", line 23, in <module>
statify = Statify()
File "Statify.py", line 7, in __init__
self.titleFont = tkFont.Font(family='Helvetica', size=24, weight='bold')
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/tkFont.py", line 88, in __init__
AttributeError: 'NoneType' object has no attribute 'tk'
From what I've read, this should work, and using an option file instead doesn't make a difference.
Python version 2.7.2
Tkinter verion 8.5

If you look at the docs for tkFont, you'll see that the problem is that tkFont.Font requires a root argument - i.e. a parent widget. Fix this by moving the call to tkFont.Font below where you create the root window, then add self.root as a keyword argument, like so:
self.root = Tk()
self.titleFont = tkFont.Font(root=self.root, family='Helvetica', size=24, weight='bold')
^^^^^^^^^^^^^^
You haven't gotten to this bug yet, but there are problems with the next line - I think you meant to write self.root.option_add rather than self.option_add, and I don't know what you're trying to do with the *Label*font business.

Error in trying to open dialog box from a widget button in python

I'm new to python. I'm trying to open a dialog box to get a value from within a widget that does a list of other staff allready.
But getting errors and can't figure out what to do.
Here's my code:
import Tkinter,Tkconstants,tkFileDialog
from Tkinter import *
import csv
import numpy
import math
import numpy.random as nrnd
import matplotlib.pyplot as plt
import shutil
import tkMessageBox
global filesavepath
class App:
def __init__(self,master):
self.mymaster=master
frame=Frame(master)
frame.pack()
self.importbutton=Button(frame,text='Import Data',command=self.importdata)
self.importbutton.pack()
self.executebutton=Button(frame,text='Execute',command=self.popup)
self.executebutton.pack()
self.distribution_rep=Button(frame,text='Repeat Purchase Score Distribution',command=self.distrepbutton)
self.distribution_rep.pack()
self.distribution_churn=Button(frame,text='Churn Probability Distribution',command=self.distchurnbutton)
self.distribution_churn.pack()
self.exitbutton=Button(frame,text='Exit',command=self.exitapp)
self.exitbutton.pack()
self.file_opt=options={}
options['defaultextension']=''
options['filetypes']=[('allfiles','.*'),('textfiles','.txt')]
options['initialdir']='C:\\'
options['initialfile']='myfile.txt'
options['parent']=root
options['title']='Thisisatitle'
def importdata(self):
filename=tkFileDialog.askopenfilename(**self.file_opt)
filesavepath="C:/input_full.csv"
shutil.copy2(filename,filesavepath)
if filename:
return open(filename,'r')
def popup(self):
top = self.top = Tkinter.Toplevel(self)
myLabel = Tkinter.Label(top, text='Enter your username below')
myLabel.pack()
self.myEntryBox = Tkinter.Entry(top)
self.myEntryBox.pack()
mySubmitButton = Tkinter.Button(top, text='Done', command=self.execbutton)
mySubmitButton.pack()
def execbutton(self):
if self.myEntryBox.get() != "":
self.timevalue = self.myEntryBox.get()
self.top.destroy()
execfile("Repeat Purchase Algo in python v6")
tkMessageBox.showinfo("Job Done", "Probability Computation completed")
def send(self):
global timevalue
timevalue=self.myEntryBox.get()
self.top.destroy()
def distrepbutton(self):
plt.hist(prob,bins=10,normed=TRUE)
plt.xlabel('Probability')
plt.title('Histogram of Repeat Purchase Probability')
plt.show()
def distchurnbutton(self):
plt.hist(churn_prob,bins=10,normed=TRUE)
plt.ylabel('Probability')
plt.title('Histogram of Churn Probability')
plt.show()
def exitapp(self):
self.mymaster.destroy()
root=Tk()
root.title('Repeat Puchase Widget')
app=App(root)
root.mainloop()
So as may be apparent to you, I'm importing dataset with an Import button, executing some analysis in another code through a button called Execute, and then showing some graphs.
What I wanted was to open a pop up kind of window on click of "Execute" button that will input a value. But I'm getting the following error:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1410, in __call__
return self.func(*args)
File "C:/Python27/widget_repeat_purchase_v4", line 42, in popup
top = self.top = Tkinter.Toplevel(self)
File "C:\Python27\lib\lib-tk\Tkinter.py", line 2017, in __init__
BaseWidget.__init__(self, master, 'toplevel', cnf, {}, extra)
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1965, in __init__
BaseWidget._setup(self, master, cnf)
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1943, in _setup
self.tk = master.tk
AttributeError: App instance has no attribute 'tk'
I've no idea what to do. Please help.

When you create the toplevel widget, you are passing self as the first argument. Tkinter requires that this be a parent widget. However, in your code self does not represent a widget.
In your specific case you want to pass in self.mymaster rather than self:
top = self.top = Tkinter.Toplevel(self.mymaster)

Use Tkinter.Toplevel() instead of Tkinter.Toplevel(self)