宇宙探索编辑部

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#1 Created at ... [Delete] [Delete and Lock User]

>>> L1=['Hello', 'World', 18, 'Apple', None]

>>> L2=[s.upper() for s in L if isinstance(s,str)]

>>> L2

['HELLO,WORLD', 'APPLE', 'WHAT']

#2 Created at ... [Delete] [Delete and Lock User]

>>> L1=['Hello', 'World', 18, 'Apple', None]

>>> L2=[s.title() for s in L if isinstance(s,str)]

>>> L2

['Hello,World', 'Apple', 'What']

#3 Created at ... [Delete] [Delete and Lock User]

>>> L1=['Hello', 'World', 18, 'Apple', None]

>>> L2=[s.lower() for s in L if isinstance(s,str)]

>>> L2

['hello,world', 'apple', 'what']