Python 3.5.2 documents
http://docs.python.jp/3/tutorial/controlflow.html#defining-functions
4.6. Define a function ... When you execute a function, you will have a new symbol table </ font> that will be used for the function's local variables. More precisely, when you make a variable assignment </ font> inside a function, all its values are stored in this local symbol table. On the other hand, doing a variable reference </ font> first looks up the local symbol table, then the local symbol table of the outer function, and then ...
Therefore, you can refer to a global variable in a function, but you cannot directly assign a value (unless you name it in the global statement).
It is unclear whether Python 3 can be used well by being aware of the symbol table.
@shiracamus told us about globals () and locals () in the comments.
Thank you for the information.
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