python之模块base64

# -*- coding: cp936 -*-
#python 27
#xiaodeng

>>> help(base64)                #用来作base64编码解码
FUNCTIONS                       #函数(功能)         
    •b16decode(s, casefold=False)
        Decode a Base16 encoded string.

　　　　　　#解码
　　　　　　decode_string=base64.b16decode('7869616F64656E67')
　　　　　　print decode_string#xiaodeng

    •b16encode(s)
        Encode a string using Base16.

　　　　　　#编码
　　　　　　string=base64.b16encode('xiaodeng')
　　　　　　print string#7869616F64656E67

        s is the string to encode.  The encoded string is returned.
    
    •b32decode(s, casefold=False, map01=None)
        Decode a Base32 encoded string.

　　　　　　#decode_string=base64.b32decode('PBUWC33EMVXGO===')
　　　　　　#print decode_string#xiaodeng

    •b32encode(s)
        Encode a string using Base32.

　　　　　 #string=base64.b32encode('xiaodeng')#PBUWC33EMVXGO===

        s is the string to encode.  The encoded string is returned.
    
    •b64decode(s, altchars=None)
        Decode a Base64 encoded string.

　　　　　　#64位解码
　　　　　　#decode_string=base64.b64decode('eGlhb2Rlbmc=')##xiaodeng

        s is the string to decode.  Optional altchars must be a string of at least
        length 2 (additional characters are ignored) which specifies the
        alternative alphabet used instead of the '+' and '/' characters.
        
        The decoded string is returned.  A TypeError is raised if s were
        incorrectly padded or if there are non-alphabet characters present in the
        string.
    
    •b64encode(s, altchars=None)
        Encode a string using Base64.

　　　　　　#64位编码
　　　　　　#string=base64.b64encode('xiaodeng')#eGlhb2Rlbmc=

        s is the string to encode.  Optional altchars must be a string of at least
        length 2 (additional characters are ignored) which specifies an
        alternative alphabet for the '+' and '/' characters.  This allows an
        application to e.g. generate url or filesystem safe Base64 strings.
        
        The encoded string is returned.
    

　　•decode(input, output) 
　　　　　Decode a file.#解码一个文件

　　　•encode(input, output)
　　　　　　Encode a file.#编码一个文件

    •decodestring(s)#用来解码字符串
        Decode a string.

　　　　　　#>>> base64.decodestring('xiaodeng')
　　　　　　#'xc6&xa8uxe9xe0'

    •encodestring(s)#用来编码字符串  

　　　　　　#>>> base64.encodestring('xc6&xa8uxe9xe0')
　　　　　　#'xiaodeng '

 
    standard_b64decode(s)
        Decode a string encoded with the standard Base64 alphabet.
        
        s is the string to decode.  The decoded string is returned.  A TypeError
        is raised if the string is incorrectly padded or if there are non-alphabet
        characters present in the string.
    
    standard_b64encode(s)
        Encode a string using the standard Base64 alphabet.
        
        s is the string to encode.  The encoded string is returned.
    
    urlsafe_b64decode(s)
        Decode a string encoded with the standard Base64 alphabet.
        
        s is the string to decode.  The decoded string is returned.  A TypeError
        is raised if the string is incorrectly padded or if there are non-alphabet
        characters present in the string.
        
        The alphabet uses '-' instead of '+' and '_' instead of '/'.
    
    urlsafe_b64encode(s)
        Encode a string using a url-safe Base64 alphabet.
        
        s is the string to encode.  The encoded string is returned.  The alphabet
        uses '-' instead of '+' and '_' instead of '/'.