if listA== [ ] more simplified version

This question already has an answer here:

How do I check if a list is empty? 25 answers

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Empty lists evaluate as falsy, so you can also do this, which is what PyCharm may be talking about:

if not listA:
    return "yes!"

There are some side effects since the above code will return "yes!" whenever list is False , an empty string ( "" ), None , an empty dict ( {} ), an empty set ( set() ) and basically anything else that python treats as falsy

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