Python简单操作字符串

去除空格及特服符号

s.strip().lstrip().rstrip(',')

赋值字符串

sStr1 = 'strcpy'sStr2 = sStr1sStr1 = 'strcpy2'print sStr2

字符串链接

sStr1 = 'strcat'sStr2 = 'append'sStr1 += sStr2print sStr1

按索引查找字符

sStr1 = 'strchr'sStr2 = 's'nPos = sStr1.index(sStr2)print nPos

字符串长度

sStr1 = 'strlen'print len(sStr1)

字符串大小转换

S.lower() #小写 S.upper() #大写sStr1 = 'JCstrlwr'sStr1 = sStr1.upper()#sStr1 = sStr1.lower()print sStr1

追加字符串指定长度

sStr1 = '12345'sStr2 = 'abcdef'n = 3sStr1 += sStr2[0:n]print sStr1

指定替换字符串内容

sStr1 = '12345'ch = 'r'n = 3sStr1 = n * ch + sStr1[3:]print sStr1

扫描字符串

sStr1 = 'cekjgdklab'sStr2 = 'gka'nPos = -1for c in sStr1:    if c in sStr2:        nPos = sStr1.index(c)        breakprint nPos

翻转字符串

sStr1 = 'abcdefg'sStr1 = sStr1[::-1]print sStr1

分割字符串

s = 'ab,cde,fgh,ijk'print(s.split(','))

链接字符串

delimiter = ','mylist = ['Brazil', 'Russia', 'India', 'China']print (delimiter.join(mylist))

只显示数字和字母

def OnlyCharNum(s,oth=''):    s2 = s.lower();    fomart = 'abcdefghijklmnopqrstuvwxyz0123456789'    for c in s2:        if not c in fomart:            s = s.replace(c,'');    return s;print(OnlyCharNum("a0**0 a我-b"))

截取字符串

str = '0123456789′print str[0:3] #截取第一位到第三位的字符print str[:] #截取字符串的全部字符print str[6:] #截取第七个字符到结尾print str[:-3] #截取从头开始到倒数第三个字符之前print str[2] #截取第三个字符print str[-1] #截取倒数第一个字符print str[::-1] #创造一个与原字符串顺序相反的字符串print str[-3:-1] #截取倒数第三位与倒数第一位之前的字符print str[-3:] #截取倒数第三位到结尾print str[:-5:-3] #逆序截取，具体啥意思没搞明白？

**
强调一下，字符串对象是不可改变的，也就是说在python创建一个字符串后，你不能把这个字符中的某一部分改变。任何上面的函数改变了字符串后，都会返回一个新的字符串，原字串并没有变。**