pipenv创建环境失败

有时候会创建多个python环境，习惯性的使用pipenv，结果之前用的好好的pipenv突然报编码错误。emmmmm…只能说诡异。

0X01 环境

python 3.6.6、pipenv 2018.11.26

0X02 错误信息

运行“pipenv shell”创建环境，结果报错了。

Failed creating virtual environment
[pipenv.exceptions.VirtualenvCreationException]:   File "e:\python36\lib\site-packages\pipenv\cli\command.py", line 390, in shell
[pipenv.exceptions.VirtualenvCreationException]:       pypi_mirror=state.pypi_mirror,
[pipenv.exceptions.VirtualenvCreationException]:   File "e:\python36\lib\site-packages\pipenv\core.py", line 2156, in do_shell
[pipenv.exceptions.VirtualenvCreationException]:       three=three, python=python, validate=False, pypi_mirror=pypi_mirror,
[pipenv.exceptions.VirtualenvCreationException]:   File "e:\python36\lib\site-packages\pipenv\core.py", line 574, in ensure_project
[pipenv.exceptions.VirtualenvCreationException]:       pypi_mirror=pypi_mirror,
[pipenv.exceptions.VirtualenvCreationException]:   File "e:\python36\lib\site-packages\pipenv\core.py", line 506, in ensure_virtualenv
[pipenv.exceptions.VirtualenvCreationException]:       python=python, site_packages=site_packages, pypi_mirror=pypi_mirror
[pipenv.exceptions.VirtualenvCreationException]:   File "e:\python36\lib\site-packages\pipenv\core.py", line 935, in do_create_virtualenv
[pipenv.exceptions.VirtualenvCreationException]:       extra=[crayons.blue("{0}".format(c.err)),]
[pipenv.exceptions.VirtualenvCreationException]: Traceback (most recent call last):
  File "e:\python36\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "e:\python36\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "e:\python36\lib\site-packages\virtualenv.py", line 2345, in 
    main()
  File "e:\python36\lib\site-packages\virtualenv.py", line 712, in main
    symlink=options.symlink)
  File "e:\python36\lib\site-packages\virtualenv.py", line 947, in create_environment
    download=download,
  File "e:\python36\lib\site-packages\virtualenv.py", line 904, in install_wheel
    call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)
  File "e:\python36\lib\site-packages\virtualenv.py", line 770, in call_subprocess
    line = line.decode(encoding)
AttributeError: 'str' object has no attribute 'decode'

Failed to create virtual environment.

网上找了一圈也没找到有人说过这个错误，难道是我查找的姿势不对？？

0X03 解决办法

看起来好像是编码的问题，打开文件"e:\python36\lib\site-packages\virtualenv.py"找到报错位置，修改代码：

proc_stdout = proc_stdout.strip().decode("utf-8")

改成：

proc_stdout = proc_stdout.strip() if type(proc_stdout) is str else proc_stdout.strip().decode("utf-8")

改完运行，又报错：

  File "e:\python36\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "e:\python36\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "e:\python36\lib\site-packages\virtualenv.py", line 2347, in 
    main()
  File "e:\python36\lib\site-packages\virtualenv.py", line 712, in main
    symlink=options.symlink)
  File "e:\python36\lib\site-packages\virtualenv.py", line 949, in create_environment
    download=download,
  File "e:\python36\lib\site-packages\virtualenv.py", line 906, in install_wheel
    call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)
  File "e:\python36\lib\site-packages\virtualenv.py", line 763, in call_subprocess
    proc.stdin.write(stdin)
TypeError: write() argument must be str, not bytes

再根据错误改：

proc.stdin.write(stdin)

在这行代码上边加上一行：

stdin = stdin if type(stdin) is str else bytes.decode(stdin,encoding='utf8')
proc.stdin.write(stdin)

运行，又报错。没事，微笑面对。

  File "e:\python36\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "e:\python36\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "e:\python36\lib\site-packages\virtualenv.py", line 2345, in 
    main()
  File "e:\python36\lib\site-packages\virtualenv.py", line 712, in main
    symlink=options.symlink)
  File "e:\python36\lib\site-packages\virtualenv.py", line 947, in create_environment
    download=download,
  File "e:\python36\lib\site-packages\virtualenv.py", line 904, in install_wheel
    call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)
  File "e:\python36\lib\site-packages\virtualenv.py", line 770, in call_subprocess
    line = line.decode(encoding)
AttributeError: 'str' object has no attribute 'decode'

我再改！！继续找到这行代码。

line = line.decode(encoding)

改成：

line = line.decode(encoding) if type(line) is not str else line

改完以后再次运行。

成功。
按理来说之前能成功运行，突然创建不了，又是编码的问题，难道是因为我电脑有改动过什么编码？？有时间再瞅瞅看能不能找到原因吧。