Why is Tkinter widget stored as None? (AttributeError: ‘NoneType’ object …)(TypeError: ‘NoneType’ object …) [duplicate]

by

widget is stored as None because geometry manager methods grid, pack, place return None, and thus they should be called on a separate line than the line that creates an instance of the widget as in:

widget = ...
widget.grid(..)

or:

widget = ...
widget.pack(..)

or:

widget = ...
widget.place(..)

And for the 2nd code snippet in the question specifically:

widget = tkinter.Button(...).pack(...)

should be separated to two lines as:

widget = tkinter.Button(...)
widget.pack(...)

Info: This answer is based on, if not for the most parts copied from, this answer.

More Related Contents:

  1. Why do I get AttributeError: ‘NoneType’ object has no attribute ‘something’?
  2. What causes `None` results from BeautifulSoup functions? How can I avoid “AttributeError: ‘NoneType’ object has no attribute…” with BeautifulSoup?
  3. How to clear the Entry widget after a button is pressed in Tkinter?
  4. Getting the widget that triggered an Event?
  5. After `x = x.y()`, why did `x` become `None` instead of being modified (possibly causing “AttributeError: ‘NoneType’ object has no attribute”)?
  6. Tkinter scrollbar for frame
  7. Why is Button parameter “command” executed when declared? [duplicate]
  8. Python None comparison: should I use “is” or ==?
  9. tkinter and time.sleep
  10. tkinter: binding mousewheel to scrollbar
  11. How to redirect print statements to Tkinter text widget
  12. What’s the difference between “update” and “update_idletasks”?
  13. How do I insert a JPEG image into a python Tkinter window?
  14. Mouse Position Python Tkinter
  15. Restricting the value in Tkinter Entry widget
  16. Removing the TK icon on a Tkinter window
  17. Tkinter: Mouse drag a window without borders, eg. overridedirect(1)
  18. Way to play video files in Tkinter?
  19. PySide / PyQt detect if user trying to close window
  20. How can I set the mouse position in a tkinter window
  21. Difference between import tkinter as tk and from tkinter import
  22. Python Tkinter Canvas fail to bind keyboard
  23. Running a Tkinter form in a separate thread
  24. Tkinter.PhotoImage doesn’t not support png image
  25. Removing Ttk Notebook Tab Dashed Line
  26. How can I create a simple message box in Python?
  27. Tkinter KeyPress and KeyRelease events
  28. Sort list while pushing None values to the end
  29. Difference between tkinter and Tkinter
  30. How to change the foreground or background colour of a selected cell in tkinter treeview?

Leave a Comment