将熊猫数据框写入JSON中的unicode

Question

我试图写一个包含unicode的熊猫DataFrame给json，但内建的.to_json函数会转义字符。我该如何解决？

实施例：

import pandas as pd 
df = pd.DataFrame([['τ', 'a', 1], ['π', 'b', 2]]) 
df.to_json('df.json') 

这给出：

{"0":{"0":"\u03c4","1":"\u03c0"},"1":{"0":"a","1":"b"},"2":{"0":1,"1":2}} 

从所期望的结果的不同：

{"0":{"0":"τ","1":"π"},"1":{"0":"a","1":"b"},"2":{"0":1,"1":2}} 

---

我曾尝试添加 force_ascii=False论点：

import pandas as pd 
df = pd.DataFrame([['τ', 'a', 1], ['π', 'b', 2]]) 
df.to_json('df.json', force_ascii=False) 

但是，这提供了以下错误：

UnicodeEncodeError: 'charmap' codec can't encode character '\u03c4' in position 11: character maps to <undefined> 

---

我使用WinPython 3.4.4.2 64位与大熊猫0.18.0

Answer 1

打开文件设置为UTF-编码8，然后将该文件传递到.to_json函数可修复问题：

with open('df.json', 'w', encoding='utf-8') as file: 
    df.to_json(file, force_ascii=False) 

给出正确的：

{"0":{"0":"τ","1":"π"},"1":{"0":"a","1":"b"},"2":{"0":1,"1":2}} 

注意：它仍然需要force_ascii=False参数。