[Tkinter] Retrieving a value from a calendar with a single click

[joe_momma]

when you created the entry widget you added a function call to result_selected and you
get an error. Entries don't call function that's where the bind key name the function
used. so first of change your entry like so:

entry_date = Entry(root)

then when you click on the entry it will call the calendar function calendar1.
you can use print instead of return

def calendar1(event):
    def result_select():
        print(cal.selection_get())# ...rest of your function

do a search of tkcalendar they made a document pdf with examples and attributes etc.