首页 > 解决方案 > IPython 中的 UnicodeEncodeError 但不是标准的 REPL

问题描述

我正在使用 Python 3.6.3 读取包含 Unicode 字符的文件。在标准 Python REPL 中,我可以通过指定 UTF-8 编码毫无问题地读取文件:

>>> with open("emoji.csv", encoding='utf-8') as f:
...     lines = f.readlines()
>>> lines
['this line has an emoji \U0001f644\n']

那里没有问题。但是,当我在 IPython 6.1.0 中尝试相同的操作时,我得到以下信息UnicodeEncodeError

In [1]: with open('emoji.csv', encoding='utf-8') as f:
...:     lines = f.readlines()
...:

In [2]: lines
Out[2]: ---------------------------------------------------------------------------
UnicodeEncodeError                        Traceback (most recent call last)
<ipython-input-2-3fb162a4fe05> in <module>()
----> 1 lines

/opt/anaconda/lib/python3.6/site-packages/IPython/core/displayhook.py in __call__(self, result)
    259             self.fill_exec_result(result)
    260             if format_dict:
--> 261                 self.write_format_data(format_dict, md_dict)
    262                 self.log_output(format_dict)
    263             self.finish_displayhook()

/opt/anaconda/lib/python3.6/site-packages/IPython/core/displayhook.py in write_format_data(self, format_dict, md_dict)
    188                 result_repr = '\n' + result_repr
    189 
--> 190         print(result_repr)
    191 
    192     def update_user_ns(self, result):

UnicodeEncodeError: 'ascii' codec can't encode character '\U0001f644' in position 24: ordinal not in range(128)

同样,如果我尝试简单地对 Unicode 字符本身进行编码和解码,我会得到同样的错误:

In [1]: '\U0001f644'.encode('utf-8').decode('utf-8')
Out[1]: ---------------------------------------------------------------------------
...
...
UnicodeEncodeError: 'ascii' codec can't encode character '\U0001f644' in position 1: ordinal not in range(128)

是什么原因造成的,我如何在 IPython 中读取这个文件?

编辑:这似乎是 IPython 默认使用 ASCII 编码的功能:

In [1]: from IPython.utils.encoding import get_stream_enc; import sys

In [2]: get_stream_enc(sys.stdout)
Out[2]: 'ANSI_X3.4-1968'

但是,我在 IPython 文档中没有看到任何关于如何更改它的内容。这可能吗?

标签: pythonpython-3.xunicodeutf-8ipython

解决方案


This is due to my system using a POSIX locale. Setting $PYTHONIOENCODING=UTF-8 resolved the issue by overriding the ASCII-based encoding IPython was using by default.


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