How do I count the occurrences of a list item?

pythonlistcount
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What does "list comprehension" and similar mean? How does it work and how can I use it?

pythonlistlist-comprehension
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Removing duplicates in lists

pythonlistalgorithmduplicatesintersection
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The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe

rr-faqlistdataframeextract
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Why does append() always return None in Python?

pythonlistappendnonetype
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