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Not a Class - TypeError: function() takes 0 positional arguments but 1 was given [duplicate]

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I've already read several postingss on Stackoverflow about this error and the questions related to it: so this function is not a class method, there's not duplicated in the script, etc. It's a tkinter even-driven function. I saw a similar one on another posting, I tried it and it worked, but mine doesn't, and I can't figure why.

If you have nothing helpful to say, please refrain from making wise remarks, otherwise thanks in advance for the help.

For clarity, I reduced the context to its bare bones:

from tkinter import *

w = Tk()

def initializeVars():
global extRequired, Keyword, filePath
## extRequired = text1.get()
## Keyword = text2.get()
## filePath=BaseDir+AllFiles
print('initializing variables')

def func(event):
print("You hit return.")
w.bind('<Return>',initializeVars)

# Buttons
Button(text='Select Folder', command=initializeVars).grid(row=10,column=2)

w.mainloop()


As you can see I'm trying to bind initializeVars function to the return key of the keybaord.

initializeVars

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1 Answer
1

w.bind('<Return>', initializeVars)


Event bindings expect a function that takes an event argument as the first parameter. So while you use the initializeVars correctly as a button handler, you need to accept the event parameter for the bind to work.

event

initializeVars

event

bind

If you don’t need the event, you can also make it optional:

def initializeVars(event = None):
# ...
print('initializing variables')