Execution model > Naming and binding > global:

appendExecution model > Naming and binding > global:
https://docs.python.org/3.6/reference/executionmodel.html

It would be impossible to assign to a global variable without global, although free variables may refer to globals without being declared global.
https://docs.python.org/3.6/reference/simple_stmts.html#the-global-statement

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