Develop Reference

Tkinter Label not Showing on MacOS

I'm currently learning Tkinter and cannot find a solution to my problem. The Tkinter Label is not showing up in the window and no one has the solution why. I am on MacOS M1 Pro.
from tkinter import *
root = Tk()
# Create label widget
myLabel = Label(root, text="Hello World!")
# Pack it onto the screen
myLabel.pack()
root.mainloop()
Shown Result:

Try adding size to your root window.
from tkinter import *
root = Tk()
root.geometry("500x500")
# Create label widget
myLabel = Label(root, text="Hello World!")
# Pack it onto the screen.
myLabel.pack()
root.mainloop()

Is there away to hide the text inside a button/label in Tkinter?

I'm a Python beginner that trying to learn my way through Tkinter, and I need your help.
Let say I create a simple button like this:
import tkinter as tk
window = tk.Tk()
button = tk.Button(text="Hello World!")
button.pack()
window.mainloop()
Is there a way that I can hide and then display the text again? Given that I can create two more buttons that will do the job of hiding and displaying. I have tried to use button.pack_forget(), but it will hide the entire button instead.
Any help would be appreciated.

To make it look like the buttons text vanishes,you can make the text color as same as the background color via cget method.
import tkinter as tk
def hide_text():
color = button['bg']
button.config(foreground=color, activeforeground=color)
window = tk.Tk()
button = tk.Button(text="Hello World!",command=hide_text)
button.pack()
window.mainloop()
Approach 2 ttk.Button:
import tkinter as tk
from tkinter import ttk
def hide_text():
button.config(text='')
window = tk.Tk()
button = ttk.Button(text="Hello World!",width=100,command=hide_text)
button.pack()
window.mainloop()
Approach3 using style:
import tkinter as tk
from tkinter import ttk
def change_button_style(event):
widget = event.widget
if widget['style'] == 'TButton':
widget.configure(style='VanishedText.TButton')
else:
event.widget.config(style='TButton')
BACKGROUND = '#f0f0f0'
FOREGROUND = '#000000'
window = tk.Tk()
window.configure(bg=BACKGROUND)
style = ttk.Style()
style.theme_use('default')
button = ttk.Button(text="Hello World!",style='VanishedText.TButton')
button.bind('<ButtonPress-1>',change_button_style)#,command=change_button_style
button.pack()
style.map('VanishedText.TButton',
foreground =[('disabled',BACKGROUND),
('!disabled',BACKGROUND),
('pressed',BACKGROUND),
('!pressed',BACKGROUND),
('active',BACKGROUND),
('!active',BACKGROUND)],
background =[('disabled',BACKGROUND),
('!disabled',BACKGROUND),
('pressed',BACKGROUND),
('!pressed',BACKGROUND),
('active',BACKGROUND),
('!active',BACKGROUND)],
focuscolor=[('disabled',BACKGROUND),
('!disabled',BACKGROUND),
('pressed',BACKGROUND),
('!pressed',BACKGROUND),
('active',BACKGROUND),
('!active',BACKGROUND)])
window.mainloop()

You Can Simply Config And Set Text :
import tkinter as tk
from tkinter import ttk
win=tk.Tk()
def hidetext():
button.config(text="")
button=ttk.Button(win,text="FooBar",command=hidetext)
button.pack()
win.mainloop()

Python: Reading from a spin box numbers and do following command of one

Good Morning/Evening,
I want to read a number from a spinbox, and if it is 2, it should print something. But my code does not work out. I've tried it with a slider instead of a spinbox and it worked out. But for me, it is really important to use a spinbox, so I hope somebody have an idea.
Code:
from tkinter import *
def a():
if spin.get()==2:
print("Hello World")
root = Tk()
root.geometry('300x100')
spin =Spinbox(root, from_=0, to=10,command=a)
button = Button(root, text='Enter')
button.pack(side=RIGHT)
spin.pack(side=RIGHT)
root.mainloop()

Adding to #coolCloud's answer I would suggest setting a textvariable for spinBox. So if the user changes it using the entry. It would automatically be updated.
Something like this:
from tkinter import *
def a(*event):
if text.get()=='2':
print("Hello World")
root = Tk()
root.geometry('300x100')
text = StringVar()
text.trace('w', a) # or give command=a in the button if you want it to call the event handler only when the button is pressed
spin =Spinbox(root, from_=0, to=10, textvariable=text)
button = Button(root, text='Enter')
button.pack(side=RIGHT)
spin.pack(side=RIGHT)
root.mainloop()

How to create a multiline entry with tkinter?

Entry widgets seem only to deal with single line text. I need a multiline entry field to type in email messages.
Anyone has any idea how to do that?

You could use the Text widget:
from tkinter import *
root = Tk()
text = Text(root)
text.pack()
root.mainloop()
Or with scrolling bars using ScrolledText:
from tkinter import *
from tkinter.scrolledtext import ScrolledText
root = Tk()
ScrolledText(root).pack()
root.mainloop()

Just use Text() widget.
For example:
import tkinter as tk
root = tk.Tk()
text = tk.Text(root)
text.pack()
root.mainloop()
Output:

How do I give focus to a python Tkinter text widget?

I'd like to be able to open the App GUI and have it automatically place the cursor into a particular text widget. Best case scenario is: as soon as the app is launched someone can start typing without having to click on the text widget. This is just a small example displaying the issue:
from Tkinter import *
root = Tk()
Window = Frame(root)
TextWidget = Text(Window)
TextWidget.pack()
Window.pack()
root.mainloop()

You use the focus_set method. For example:
from Tkinter import *
root = Tk()
Window = Frame(root)
TextWidget = Text(Window)
TextWidget.pack()
Window.pack()
TextWidget.focus_set()
root.mainloop()