python过滤到csv.reader的输入

Question

My program reads a csv file but recently the input file was changed to be base64 encoded. So currently the read code is:

with open(uploadFile, 'rb') as csvfile:
    spreadSheet = csv.reader(csvfile, delimiter=',')

I know the csv is a file descriptor and this can't be done, but I want to do something like:

import base64
with open(uploadFile, 'rb') as csvfile:
   spreadSheet = csv.reader(bas64.decode(csvfile), delimiter=',')

That is the file input would be base64 decoded as though in a pipe and then parsed as a csv file.

I can read the file decode it write back into another file and then read that file with the csv reader but that all seems as though there should be a way to do it as a pipe sequence.

Answer 1

Try the following

import base64
import csv

with open(uploadFile, 'rb') as csvfile:
    decoded = base64.standard_b64decode(csvfile.read()).decode('utf-8')
    spreadSheet = csv.reader(decoded.splitlines(), delimiter=',')