可以使用str字符串中的字符来连接join()中的list
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>>> a
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['H', 'e', 'llo']
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>>> b=''.join(a)
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>>> b
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'Hello'
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>>> c='-'.join(a)
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>>> c
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'H-e-llo'
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>>> d='*'
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>>> e=d.join(a)
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>>> e
可以使用str字符串中的字符来连接join()中的list
>>> a
['H', 'e', 'llo']
>>> b=''.join(a)
>>> b
'Hello'
>>> c='-'.join(a)
>>> c
'H-e-llo'
>>> d='*'
>>> e=d.join(a)
>>> e