L = ['Hello', 'World', 'IBM', 18, 'TOYOU']
l = [i.lower() if isinstance(i,str) else i for i in L]
print(L)
print(l)
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L = ['Hello', 'World', 'IBM', 18, 'TOYOU']
l = [i.lower() if isinstance(i,str) else i for i in L]
print(L)
print(l)