How to implement a variable scope in Python

In this issue, the editor will bring you about how to achieve a variable scope in Python. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

Python searches for a variable in the order of "local scope", "nested scope", "global scope" and "built-in scope"

In def foo (): B = 'aaa' # Python, you can redefine the function def bar (): C = True print (a) print (b) print (c) bar () # print (c) # NameError: name 'c' is not definedif _ _ name__ = =' _ main__': a = 100 # print (b) # NameError: name 'b' is not defined foo ()

A variable an is defined in the if branch of the code, which is a global variable (global variable) and belongs to the global scope, because it is not defined in any function.

In the above foo function, we define the variable b, which is a local variable (local variable) defined in the function, belongs to the local scope, and cannot be accessed outside the foo function.

But for the bar function inside the foo function, the variable b belongs to the nested scope, and we can access it in the bar function.

The variable c in the bar function belongs to the local scope and cannot be accessed outside the bar function

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