python2.7:str

# coding=utf-8
# delete char or str in str
sstr = "   hello"
sstr.strip()  #'\n', '\r',  '\t',  ' '
print sstr
print sstr.strip()

str1 = "123abc"
print str1.lstrip("21")
print str1.rstrip('bc')

# copy str
# strcpy(sstr1,sstr2)
sstr1 = 'strcpy'
sstr2 = sstr1
print sstr2

# cat str
# strcat(sstr1,sstr2)
sstr1 = 'strcat'
sstr2 = 'append'
sstr1 += sstr2
print sstr1

# search char
# strchr(sstr1,sstr2)
# < 0 have not finded
sstr1 = 'strchr'
sstr2 = 's'
npos = sstr1.index(sstr2)
print npos

# compare str
# strcmp(sStr1,sStr2)
sstr1 = 'strchr'
sstr2 = 'strch'
print cmp(sstr1,sstr2)

# scan str have include the char
# strspn(sstr1,sstr2)
sstr1 = '12345678'
sstr2 = '456'
# sstr1 and chars both in sstr1 and sstr2
print len(sstr1 and sstr2)

# str len
# strlen(sstr1)
sstr1 = 'strlen'
print len(sstr1)

# upper lower
# strlwr(sstr1)
sstr1 = 'JCstrlwr'
sstr1 = sstr1.upper()
print sstr1
sstr1 = sstr1.lower()
print sstr1

# cat n len str 
# strncat(sStr1,sStr2,n)
sstr1 = '12345'
sstr2 = 'abcdef'
n = 3
sstr1 += sstr2[0:n]
print sstr1

# cmp n len str
# strncmp(sstr1,sstr2,n)
sstr1 = '12345'
sstr2 = '123bc'
n = 3
print cmp(sstr1[0:n],sstr2[0:n])

# cpy n len str
# strncpy(sstr1,sstr2,n)
sstr1 = ''
sstr2 = '12345'
n = 3
sstr1 = sstr2[0:n]
print sstr1

# n char str head set 
# strnset(sstr1,ch,n)
sstr1 = '12345'
ch = 'r'
n = 3
sstr1 = n * ch + sstr1[3:]
print sstr1

# scan str
# strpbrk(sstr1,sstr2)
sstr1 = 'cekjgdklab'
sstr2 = 'gka'
npos = -1
for c in sstr1:
    if c in sstr2:
        npos = sstr1.index(c)
        break
print npos

# str rev
# strrev(sstr1)
sstr1 = 'abcdefg'
sstr1 = sstr1[::-1]
print sstr1

# find str
# strstr(sstr1,sstr2)
sstr1 = 'abcdefg'
sstr2 = 'cde'
print sstr1.find(sstr2)

# separator str
# strtok(sstr1,sstr2)
sstr1 = 'ab,cde,fgh,ijk'
sstr2 = ','
sstr1 = sstr1[sstr1.find(sstr2) + 1:]
print sstr1
# or
s = 'ab,cde,fgh,ijk'
print(s.split(','))

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

# php addslashes 
def addslashes(s):
    d = {'"':'\\"', "'":"\\'", "\0":"\\\0", "\\":"\\\\"}
    return ''.join(d.get(c, c) for c in s)
 
s = "John 'Johny' Doe (a.k.a. \"Super Joe\")\\\0"
print s
print addslashes(s)

# only char num
def only_char_num(s,oth=''):
    s2 = s.lower();
    fomart = 'abcdefghijklmnopqrstuvwxyz0123456789'
    for c in s2:
        if not c in fomart:
            s = s.replace(c,'');
    return s;
 
print(only_char_num("a000 aa-b"))

# log:
#    hello
# hello
# 3abc
# 123a
# strcpy
# strcatappend
# 0
# 1
# 3
# 6
# JCSTRLWR
# jcstrlwr
# 12345abc
# 0
# 123
# rrr45
# 2
# gfedcba
# 2
# cde,fgh,ijk
# ['ab', 'cde', 'fgh', 'ijk']
# Brazil,Russia,India,China
# John 'Johny' Doe (a.k.a. "Super Joe")\

来自：点击打开链http://www.cnblogs.com/huangcong/archive/2011/08/29/2158268.html

黄聪：Python 字符串操作（string替换、删除、截取、复制、连接、比较、查找、包含、大小写转换、分割等）

去空格及特殊符号

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

复制字符串

#strcpy(sStr1,sStr2)
sStr1 = 'strcpy'
sStr2 = sStr1
sStr1 = 'strcpy2'
print sStr2

连接字符串

#strcat(sStr1,sStr2)
sStr1 = 'strcat'
sStr2 = 'append'
sStr1 += sStr2
print sStr1

查找字符

#strchr(sStr1,sStr2)
# < 0 为未找到
sStr1 = 'strchr'
sStr2 = 's'
nPos = sStr1.index(sStr2)
print nPos

比较字符串

#strcmp(sStr1,sStr2)
sStr1 = 'strchr'
sStr2 = 'strch'
print cmp(sStr1,sStr2)

扫描字符串是否包含指定的字符

#strspn(sStr1,sStr2)
sStr1 = '12345678'
sStr2 = '456'
#sStr1 and chars both in sStr1 and sStr2
print len(sStr1 and sStr2)

字符串长度

#strlen(sStr1)
sStr1 = 'strlen'
print len(sStr1)

将字符串中的大小写转换

#strlwr(sStr1)
sStr1 = 'JCstrlwr'
sStr1 = sStr1.upper()
#sStr1 = sStr1.lower()
print sStr1

追加指定长度的字符串

#strncat(sStr1,sStr2,n)
sStr1 = '12345'
sStr2 = 'abcdef'
n = 3
sStr1 += sStr2[0:n]
print sStr1

字符串指定长度比较

#strncmp(sStr1,sStr2,n)
sStr1 = '12345'
sStr2 = '123bc'
n = 3
print cmp(sStr1[0:n],sStr2[0:n])

复制指定长度的字符

#strncpy(sStr1,sStr2,n)
sStr1 = ''
sStr2 = '12345'
n = 3
sStr1 = sStr2[0:n]
print sStr1

将字符串前n个字符替换为指定的字符

#strnset(sStr1,ch,n)
sStr1 = '12345'
ch = 'r'
n = 3
sStr1 = n * ch + sStr1[3:]
print sStr1

扫描字符串

#strpbrk(sStr1,sStr2)
sStr1 = 'cekjgdklab'
sStr2 = 'gka'
nPos = -1
for c in sStr1:
    if c in sStr2:
        nPos = sStr1.index(c)
        break
print nPos

翻转字符串

#strrev(sStr1)
sStr1 = 'abcdefg'
sStr1 = sStr1[::-1]
print sStr1

查找字符串

#strstr(sStr1,sStr2)
sStr1 = 'abcdefg'
sStr2 = 'cde'
print sStr1.find(sStr2)

分割字符串

#strtok(sStr1,sStr2)
sStr1 = 'ab,cde,fgh,ijk'
sStr2 = ','
sStr1 = sStr1[sStr1.find(sStr2) + 1:]
print sStr1
#或者
s = 'ab,cde,fgh,ijk'
print(s.split(','))

连接字符串

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

PHP 中 addslashes 的实现

def addslashes(s):
    d = {'"':'\\"', "'":"\\'", "\0":"\\\0", "\\":"\\\\"}
    return ''.join(d.get(c, c) for c in s)
 
s = "John 'Johny' Doe (a.k.a. \"Super Joe\")\\\0"
print s
print addslashes(s)

只显示字母与数字

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(OnlyStr("a000 aa-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？