现在才知道python的强大

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

print('L1 = [\'Hello\', \'World\', 18, \'Apple\', None]')
print('把L1中所有的字符串变成小写:',end = '')
print([s.lower() for s in L1 if isinstance(s,str)])

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

少了一行

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

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

,end = ''是什么意思呀

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

不写end=''则输入后换行，写了则不换行；实际上print默认输出是换行的 print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False) ，写了end=''则替代了end='\n'