#coding:utf-8
a = "  abc  daaa  "
a = a.strip()
print a

>>>abc  daaa


#结论：s.strip(rm)的作用是去除字符串前后的rm字符
#     s.strip()的作用是去除前后两边的空白符(包括换行符)    

#coding:utf-8
str_1 = "-"
a = "abcd"

print str_1.join(a)

>>>a-b-c-d

#coding:utf-8

a  = "ab c d ef"
b = "www.baidu.com"

print a.split()   #不指定即空格作为分隔符
print b.split(".")  #以点作为分隔符

>>>
['ab', 'c', 'd', 'ef']
['www', 'baidu', 'com']