Python中join和split用法实例
join用来连接字符串，split恰好相反，拆分字符串的。
不用多解释，看完代码，其意自现了。
>>>li=['my','name','is','bob']
>>>''.join(li)
'mynameisbob'
>>>s='_'.join(li)
>>>s
'my_name_is_bob'
>>>s.split('_')
['my','name','is','bob']
其join和split的英文版解释如下：
join(...)
S.join(sequence)->string
Returnastringwhichistheconcatenationofthestringsinthe
sequence. TheseparatorbetweenelementsisS.
split(...)
S.split([sep[,maxsplit]])->listofstrings
ReturnalistofthewordsinthestringS,usingsepasthe
delimiterstring. Ifmaxsplitisgiven,atmostmaxsplit
splitsaredone.IfsepisnotspecifiedorisNone,any
whitespacestringisaseparatorandemptystringsareremoved
fromtheresult.