How to determine if a list is empty in Python

There is a need to determine whether the list is empty. The method is very simple, for example:

The empty list is equal to False,

then directly if a is Determine the command that needs to be executed when the list is not empty

a = [] if a: COMMAND

Similarly, len(a) = 0

When a is not empty, execute Command

a = [] if len(a): COMMAND

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