python3 method to determine if a list is an empty list

This article mainly introduces the method of judging whether a list is an empty list in python3. It has certain reference value. Now I share it with you. Friends in need can refer to it

python3 determines the empty list

@(python3)

There is a need to determine whether the list is empty. I have tried many methods, such as:

a = []
if a is not None:
 COMMAND

a = []
if a[0] is None:
 COMMAND

All kinds of messy logic are always unsatisfactory. it's actually really easy.

a = []
if a:
 COMMAND

An empty list is equal to False,

Then direct if a is to determine the command that needs to be executed when the list is not empty

a = []

if len(a):
 COMMAND

Similarly, len(a) = 0

When a is not empty, execute Command

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