Op 02-07-18 om 03:54 schreef Chris Roy-Smith:
Hi,
I'm trying to understand working with objects.
If I have grasped things correctly a widget is an object. So why can I
assign the widget, or use it stand alone? See sample code below
=====================
#!/usr/bin/python3
from tkinter import *
main=Tk()
# as I understand it this will create an instance of the button widget
called b1
b1=Button(main, text='instantce', command= lambda b='goodbye' :
print(b)).grid(row=1, column=0)
# but here I haven't made an instance, but all seems well
Button(main, text='test1', command=lambda a='hello'
:print(a)).grid(row=0, column=0)
You still create an instance, but don't assign it to a variable. See
following example:
class Foo:
def __init__(self):
print("Instance created")
f = Foo() # prints "Instance created"
Foo() # print "Instance created"
Two instances are created, just that the second one isn't accessible.
Timo
main.mainloop()
=======================
any explanation gratefully recieved
Regards, Chris ROy-Smith
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