Python syntax Learning Objects and references, local and global variables

Object and reference: When you create an object and assign it a variable, this variable only refers to that object, rather than the object itself.

That is to say,The variable name points to the memory of the object stored in your computer (pointing to the same memory unit). This is calledName to object binding.

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If you want to copy a list or similar sequence or other complex objects (not simple objects such as integers), then youYou must use the slice operator to obtain a copy.

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Local and global variables

When you declare variables in the function definition, they have no relationship with other variables with the same name outside the function, that isVariable names are partial for functions.

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GlobalStatement is used to declareXIs Global

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