python 简单地从字符串或可读文件中解码base64内容

Posted 2021-05-09

#!/usr/bin/python

# Demo code. Decode base64 content from a string or a readable file
# Works for Python 2.7.3, at least 

# Usage
# decodebase64.py base64string
# decodebase64.py /absolute/path/to/base64/file

import sys
import os
import base64    

# testStr is for test usage, when they are assinged to the variable s to replace ''.
#testStr='Y29uZmlnLmpzb24ub2Jmc3Byb3h5LjIwMTYwMjIyXzE3NDcyOA=='
#testStr2='/path/to/base64/file'

def decodeStr(s):
    rslt=base64.b64decode(s)
    print 'Decoded result:\n',rslt


def decodeFile(fPath):
    f = open(fPath, 'r')  # better to use the with-as clause
    readed = [line.rstrip() for line in f]
    f.close()
    strReaded = ''.join(readed)
    print strReaded
    decodeStr(strReaded)

def main():
    print 'Args: ',str(sys.argv) 
    # s = testStr
    s = ''
    if len(sys.argv) > 1:
        s=sys.argv[1]

    if os.path.isabs(s):
        decodeFile(s)
    elif len(s) > 0:
        decodeStr(s)
    else:
        print "Nothing I can do"

main()