提取json字段并将它们写入python的csv中

Question

我有一个非常大的json，有多个字段，我只想提取其中的一些，然后将它们写入csv。

这里是我的代码：

#!/usr/bin/python3 
# -*- coding: utf-8 -*- 

import json 

import csv 

data_file = open("book_data.json", "r") 
values = json.load(data_file) 
data_file.close() 

with open("book_data.csv", "wb") as f: 
    wr = csv.writer(f) 
    for data in values: 
     value = data["identifier"] 
     value = data["authors"] 
     for key, value in data.iteritems(): 
       wr.writerow([key, value]) 

它给我这个错误：

File "json_to_csv.py", line 22, in <module> 
wr.writerow([key, value]) 
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 8: ordinal not in range(128) 

但我给顶部的UTF-8编码，所以我不知道什么是错在那里。

感谢

Answer 1

你需要对数据进行编码：

wr.writerow([key.encode("utf-8"), value.encode("utf-8")]) 

的差别相当于：

In [8]: print u'\u2019'.encode("utf-8") 
’ 

In [9]: print str(u'\u2019') 
--------------------------------------------------------------------------- 
UnicodeEncodeError      Traceback (most recent call last) 
<ipython-input-9-4e3ad09ee31b> in <module>() 
----> 1 print str(u'\u2019') 

UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 0: ordinal not in range(128) 

如果你有字符串和列表和值的混合物，可以使用issinstance检查你有什么，如果你有一个列表迭代和编码：

with open("book_data.csv", "wb") as f: 
    wr = csv.writer(f) 
    for data in values: 
     for key, value in data.iteritems(): 
       wr.writerow([key, ",".join([v.encode("utf-8") for v in value]) if isinstance(value, list) else value.encode("utf8")]) 

只写了三列creator, contributor和identifier，使用钥匙随便拉数据：

import csv 

with open("book_data.csv", "wb") as f: 
    wr = csv.writer(f) 
    for dct in values: 
     authors = dct["authors"] 
     wr.writerow((",".join(authors["creator"]).encode("utf-8"), 
        "".join(authors["contributor"]).encode("utf-8"), 
        dct["identifier"].encode("utf-8")))