Python中字符串操作函数string.split('str1')和string.join(ls)
Python中的字符串操作函數(shù)split 和 join能夠?qū)崿F(xiàn)字符串和列表之間的簡(jiǎn)單轉(zhuǎn)換,
使用 .split()可以將字符串中特定部分以多個(gè)字符的形式,存儲(chǔ)成列表
1 def split(self, *args, **kwargs): # real signature unknown 2 """ 3 Return a list of the words in the string, using sep as the delimiter string. 4 5 sep 6 The delimiter according which to split the string. 7 None (the default value) means split according to any whitespace, 8 and discard empty strings from the result. 9 maxsplit 10 Maximum number of splits to do. 11 -1 (the default value) means no limit. 12 """ 13 pass如上所說(shuō),split()函數(shù),使用字符串中的字符作為分隔符(sep),返回字符串分詞的列表(不含有作為分隔符的字符),如果分隔符為None,則以字符串中的空格作為分隔符;同時(shí)還可以傳入一個(gè)int參數(shù)
作為分隔的次數(shù),(默認(rèn)值 為 -1,不限制次數(shù))
eg:
>>>:s = 'Process finished with exit code 0'>>>:s.split()# sep:None;maxsplit:-1.空格作為分隔符,分隔所有 ['Process', 'finished', 'with', 'exit', 'code', '0']>>>:s.split('i')#sep:‘i’;maxsplit:-1.‘i’作為分隔符,分割所有 ['Process f', 'n', 'shed w', 'th ex', 't code 0']>>>:s.split('i', 2)#sep:‘i’;maxsplit:2.‘i’作為分隔符,分割兩次 ['Process f', 'n', 'shed with exit code 0']
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再進(jìn)一步:
>>>:s = 'Process finished with exiiit code 0'>>>:s.split('i') ['Process f', 'n', 'shed w', 'th ex', '', '', 't code 0']使用join()可以將列表中的字符串類(lèi)型數(shù)據(jù),組合成一個(gè)字符串:
1 def join(self, ab=None, pq=None, rs=None): # real signature unknown; restored from __doc__ 2 """ 3 Concatenate any number of strings. 4 5 The string whose method is called is inserted in between each given string. 6 The result is returned as a new string. 7 8 Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs' 9 """ 10 pass如上所說(shuō)連接任意數(shù)量的字符串,將字符串插入到被調(diào)用的兩兩字符串間,返回一個(gè)新的字符串。
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總結(jié):
s = 'abcdabcd'ls = s.split('c')s2 = 'c'.join(ls)s = s2上面利用兩個(gè)函數(shù)互相轉(zhuǎn)化,使用split()由字符串得到新列表,再使用join()由列表得到新字符串,
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轉(zhuǎn)載于:https://www.cnblogs.com/wangwenhao072093/p/10580414.html
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