[PYTHON] UnicodeDecodeError occurs in pip (Windows environment)

When I installed PyYAML using pip on Windows, I got a UnicodeDecodeError and could not install it, so this is the solution.

environment

Windows 7 Professional SP1 64bit Python 3.6.1 (64bit) pip 9.0.1

error contents

When I try to install PyYAML, I get a UnicodeDecodeError ...

python

>pip install PyYAML
Collecting PyYAML
  Using cached PyYAML-3.12.tar.gz
Installing collected packages: PyYAML
  Running setup.py install for PyYAML ... error
Exception:
Traceback (most recent call last):
  File "c:\python36\lib\site-packages\pip\compat\__init__.py", line 73, in console_to_str
    return s.decode(sys.__stdout__.encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x83 in position 80: invalid start byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\python36\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "c:\python36\lib\site-packages\pip\commands\install.py", line 342, in run
    prefix=options.prefix_path,
  File "c:\python36\lib\site-packages\pip\req\req_set.py", line 784, in install
    **kwargs
  File "c:\python36\lib\site-packages\pip\req\req_install.py", line 878, in install
    spinner=spinner,
  File "c:\python36\lib\site-packages\pip\utils\__init__.py", line 676, in call_subprocess
    line = console_to_str(proc.stdout.readline())
  File "c:\python36\lib\site-packages\pip\compat\__init__.py", line 75, in console_to_str
    return s.decode('utf_8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x83 in position 80: invalid start byte

Solution

The problem was solved by changing the character code of the command prompt to "UTF-8".

1) Check the character code of the command prompt.

python

>chcp
Current code page: 932

If "932" is displayed by the chcp command, the character code is "Shift JIS".

2) Change the character code of the command prompt

You can change the character code to "UTF-8" by specifying "65001" with the chcp command.

python

>chcp 65001
Active code page: 65001

3) Install PyYAML

PyYAML was successfully installed.

python

>pip install PyYAML
Collecting PyYAML
  Using cached PyYAML-3.12.tar.gz
Installing collected packages: PyYAML
  Running setup.py install for PyYAML ... done
Successfully installed PyYAML-3.12

Postscript

I also got a UnicodeDecodeError when installing the mstranslator package. http://qiita.com/akabei/items/2356bb1ac282f6dd2a45

This was not solved by the method of this article, so I solved it by referring to the following article.

The point of introducing Python external modules on Windows http://qiita.com/yukinoi/items/1fe023408d3e684da983

When developing Python on Windows, there are some character code problems ...