Python字符串split学习一（自定义字符串拆分）

开始学习python,第二天，尽管python内建函数split已经能干很多事情，但是遇到这种情况就要自己定义函数了：

string = '  wang__chuang_____bo '

 

#coding=utf-8#string split#author wangchuanbo#time 2013-09-20s = '&aa    ab        ac    ad&'#去掉字符串开头和结尾的指定字符s1 = s.strip('&')print s1#步骤一：先找第一个单词a = s1.find(" ")word1 = s1[:a]print 'the first word is:',word1#步骤二：找第二个单词while s1[a] == " ":        a = a + 1b = s1.find(" ",a)word2 = s1[a:b]print 'the second word is:',word2#自定义的拆分方法#string:要拆分的字符串,delimiter:分隔符,begin_end:字符串开始和结尾标识符def my_split(string,delimiter,begin_end=" "):        string = string.strip(begin_end)        a = string.find(delimiter)        first_word = string[:a]        result = []        result.append(first_word)        b = a        while b <= len(string) and b != -1:                while string[a] == delimiter:                        a = a + 1                b = string.find(delimiter,a)                if b != -1:                        res = string[a:b]                else:                        res = string[a:]                a = b                result.append(res)        return result                s1 = '&adfs    sdfjklsj  dd de&'  #如果仅是拆除空格s1.split()可以搞定print my_split(s1," ","&")s2 = '  jkj**jkjk*jkkk****d 'print my_split(s2,"*")s3 = ' wang__chuan_____bo  'print my_split(s3,'_')s4 = '   wang..xiao.....yuan 'print my_split(s4,'.')