博文
Python: check if something is a member of a variable
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# built-in function - in
>>> country='Deutschland'
>>> 'y' in country
False
>>> 'a' in country
True
>>> 'b' not in country
True
>>> family=['mom','dad','sis']
>>> 'bro' in family
False
>>> 'sis' in family
True
https://wap.sciencenet.cn/blog-3031432-1015529.html
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