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When the module variable is assigned in def, it will be reported as follows: Shadows name ‘xxx’ from outside scope

In this case, you need to reference module variables through global declaration in def

For example

level = 0

def test():
global level
 level += 1

Python variable scope:
module corresponds to global,
the innermost layer is local,
the outer layer is nonlocal
variable search order: inner scope – > Outer layer – > Global – > Builtin
only class, def and lamda can change the scope