Python中的base64編碼

Question

我想使用函數base64.encode()直接對Python中文件的內容進行編碼。

的documentation狀態：

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.

所以我這樣做：

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

，並出現以下錯誤：

>>> 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' 

爲了我的眼睛，看起來像在/usr/lib/python3.6/base64.py的錯誤但我很大一部分不想相信...

Answer 1

從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')) 

應該工作