What does the Python language use to indicate the hierarchical relationship of each line of code?

The Python language uses strict "indentation" to indicate the format framework of the program. Indentation refers to the blank space before the beginning of each line of code, which is used to indicate the inclusion and hierarchical relationship between codes.

1 indent = 4 spaces.

Indentation is the only way to indicate the program framework in the Python language. When expressing program meanings such as branches, loops, functions, classes, etc., indentation is used in if, while, for, The complete statement of reserved words such as def and class ends with an English colon (:) and is indented afterwards, indicating the ownership relationship between the subsequent code and the immediately unindented statement.

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Indentation style

Single-layer indentation

Multiple levels of indentation

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