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check if object is in list python

l1 = [1]
l2 = [2,3,4]

if len(set(l1).intersection(set(l2)))==0:
    print('1 is not in the list (l2)')
else: # len()>0
    print('1 is in the list (l2)')

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check if object is list python

if isinstance(listname, list):

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check if object is in list python

check if object is list python

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