Base64解码

项目的log里有很多上传文件后的base64编码的字符串，想把它解码为原来的文件。

import base64

with open('c:/excelText.txt','r') as f1:
    s = f1.read()
    b = base64.decodebytes(bytes(s,encoding='UTF-8'))
    with open('c:/excelText.xls','wb') as f2:
        f2.write(b)

稍带把编码的也写一下

import base64

with open('c:/excelText.xls','rb') as f1:
    b = f1.read()
    s = str(base64.encodebytes(b),encoding='UTF-8')
    with open('c:/excelText.txt','w') as f2:
        f2.write(s)

如果编码解码双方都是文件的话，还有更简单的(读写都必须以二进制打开文件)。
编码

import base64

with open('c:/excelText.xls','rb') as f1:
    with open('c:/excelText.txt','wb') as f2:
        base64.encode(f1,f2)

解码

import base64

with open('c:/excelText.txt','rb') as f1:
    with open('c:/excelText.xls','wb') as f2:
        base64.decode(f1,f2)