嘗試將Python 2.7代碼轉換為Python 3.4代碼時出現TypeError

Question

我在將下面為Python 2.7編寫的代碼轉換為Python 3.4兼容的代碼時遇到了問題。 我得到錯誤TypeError: can't concat bytes to str在行outfile.write(decompressedFile.read())中將TypeError: can't concat bytes to str 。 所以我用outfile.write(decompressedFile.read().decode("utf-8", errors="ignore"))替換了這行，但這導致了錯誤相同的錯誤。

import os
import gzip
try:
    from StirngIO import StringIO
except ImportError:
    from io import StringIO
import pandas as pd
import urllib.request
baseURL = "http://ec.europa.eu/eurostat/estat-navtree-portlet-prod/BulkDownloadListing?file="
filename = "data/irt_euryld_d.tsv.gz"
outFilePath = filename.split('/')[1][:-3]

response = urllib.request.urlopen(baseURL + filename)
compressedFile = StringIO()
compressedFile.write(response.read().decode("utf-8", errors="ignore"))

compressedFile.seek(0)

decompressedFile = gzip.GzipFile(fileobj=compressedFile, mode='rb') 

with open(outFilePath, 'w') as outfile:
    outfile.write(decompressedFile.read()) #Error

Answer 1

問題是GzipFile需要包裝一個面向字節的文件對象，但是你傳遞的是一個面向文本的StringIO 。 請改用io.BytesIO ：

from io import BytesIO  # Works even in 2.x

# snip

response = urllib.request.urlopen(baseURL + filename)
compressedFile = BytesIO()  # change this
compressedFile.write(response.read())  # and this

compressedFile.seek(0)

decompressedFile = gzip.GzipFile(fileobj=compressedFile, mode='rb') 

with open(outFilePath, 'w') as outfile:
    outfile.write(decompressedFile.read().decode("utf-8", errors="ignore"))
    # change this too