why is += operator not working

2018-06-07 20:16:31

This question already has an answer here:

Using global variables in a function other than the one that created them 18 answers

You mixed two different ideas in Python, a " global statement" and an "augmented assignment statement."

A " global statement" has a very simple syntax:

"global" identifier ("," identifier)*

No expression is allowed in a global statement.

Perhaps you wanted to say:

global counter
counter += 1

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