Function calling error ?

Question

I define a function that has one argument in a ".py" file .
I access the folder with the command line.
I run python on command line.
I import the function and i call it with an argument that is random
Why do i have an error telling me that the thing that wrote during is not defined ?
This would be the role of a function, no ?
Thank you

Answer 1

*during calling

Answer 2

Maybe you tried inputting into function variable name, not string?
Instead of:
func(somestr)
You should:
func('somestr')

I didn't quite understand your question. If you want it to work, just write the function and operations with it in one .py file

Answer 3

Thank you i will try that