Python | forget_pack() and forget_grid() method in Tkinter
If we want to unmap any widget from the screen or toplevel then forget() method is used. There are two types of forget method forget_pack()forget() ) and forget_grid() which are used with pack() and grid() method respectively.
forget_pack() method –
Syntax: widget.forget_pack() widget can be any valid widget which is visible.
# Imports tkinter and ttk modulefrom tkinter import * from tkinter.ttk import * # toplevel windowroot = Tk() # method to make widget invisible# or remove from topleveldef forget(widget): # This will remove the widget from toplevel # basically widget do not get deleted # it just becomes invisible and loses its position # and can be retrieve widget.forget() # method to make widget visibledef retrieve(widget): widget.pack(fill = BOTH, expand = True) # Button widgetsb1 = Button(root, text = "Btn 1")b1.pack(fill = BOTH, expand = True) # See, in command forget() method is passedb2 = Button(root, text = "Btn 2", command = lambda : forget(b1))b2.pack(fill = BOTH, expand = True) # In command retrieve() method is passedb3 = Button(root, text = "Btn 3", command = lambda : retrieve(b1))b3.pack(fill = BOTH, expand = True) # infinite loop, interrupted by keyboard or mousemainloop() |
Output:
After forget
After retrieval
Notice the difference in the position of Button 1 before and after forget as well as after retrieval.
forget_grid() method –
Syntax: widget.forget_grid() widget can be any valid widget which is visible.
Note : This method can be used only with grid() geometry methods.
Code #2:
# Imports tkinter and ttk modulefrom tkinter import *from tkinter.ttk import * # toplevel windowroot = Tk() # method to make widget invisible# or remove from topleveldef forget(widget): # This will remove the widget from toplevel # basically widget do not get deleted # it just becomes invisible and loses its position # and can be retrieve widget.grid_forget() # method to make widget visibledef retrieve(widget): widget.grid(row = 0, column = 0, ipady = 10, pady = 10, padx = 5) # Button widgetsb1 = Button(root, text = "Btn 1")b1.grid(row = 0, column = 0, ipady = 10, pady = 10, padx = 5) # See, in command forget() method is passedb2 = Button(root, text = "Btn 2", command = lambda : forget(b1))b2.grid(row = 0, column = 1, ipady = 10, pady = 10, padx = 5) # In command retrieve() method is passedb3 = Button(root, text = "Btn 3", command = lambda : retrieve(b1))b3.grid(row = 0, column = 2, ipady = 10, pady = 10, padx = 5) # infinite loop, interrupted by keyboard or mousemainloop() |
Output:
After Forget
After Retrieval
Notice that the position of Button 1 remains same after forget and retrieval. With grid_forget() method, you can place it at any grid after retrieval but generally, the original grid is chosen.
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