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in,not in,整體註釋

name = "鄭建文"
if '建' in name:
    print('在')
else:
    print('error')
if '文' not in name:
    print('不在')
else:
    print('error')

輸出:

error

整體註釋:

Ctrl + /
或者’’’ ‘’’
或者""" “”"