字符串中的内嵌函数
1、isalpha（判断是否都为字母）
#! /usr/bin/python
#coding:utf-8
string="welcome"
string1="welcome123"
print "string:%d"%(string.isalpha())
print "string1:%d"%(string1.isalpha())
2、strip（字符串分割）
#! /usr/bin/python
#coding:utf-8
string=" welcome to my home "
string1="what's your name"
string1_strip=string1.strip()
string_strip=string.strip()
print string
print string_strip
print "================"
print string1
print string1_strip
3、split（去除前导和尾随空格）
#! /usr/bin/python
#coding:utf-8
string="welcome to my home"
string_split=string.split(" ")
print string
print string_split
4、join（字符串拼接）
#! /usr/bin/python
#coding:utf-8
string="welcome to my home"
string_split=string.split(" ")
string_join=" ".join(string_split)
print string
print string_split
print string_join
5、__len__（字符串长度）
#! /usr/bin/python
#coding:utf-8
string="welcome to my home"
string_len=len(string)
print string
print string_len
