Python中的base64编码

Question

我想使用函数base64.encode()直接对Python中文件的内容进行编码。

的documentation状态：

base64.encode(input, output)

Encode the contents of the binary input file and write the resulting base64 encoded data to the output file. input and output must be file objects.

所以我这样做：

encode(open('existing_file.dat','r'), open('output.dat','w')) 

，并出现以下错误：

>>> import base64 
>>> base64.encode(open('existing_file.dat','r'), open('output.dat','w')) 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/usr/lib/python3.6/base64.py", line 502, in encode 
    line = binascii.b2a_base64(s) 
TypeError: a bytes-like object is required, not 'str' 

为了我的眼睛，看起来像在/usr/lib/python3.6/base64.py的错误但我很大一部分不想相信...

Answer 1

从docs

when opening a binary file, you should append 'b' to the mode value to open the file in binary mode

因此更改

encode(open('existing_file.dat','r'), open('output.dat','w')) 

到

encode(open('existing_file.dat','rb'), open('output.dat','wb')) 

应该工作