pip install twisted报错assert os.path.exists(pyc_path)AssertionError 解决方案

问题描述

在安装ggplibggplib/doc at master · richemslie/ggplib · GitHub试图构建propnet时，在运行完以下指令：

virtualenv -p pypy bin/install/_pypy
. ./bin/install/_pypy/bin/activate
pip install twisted

出现了错误：

ERROR: Exception:
Traceback (most recent call last):
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/cli/base_command.py", line 223, in _main
    status = self.run(options, args)
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/cli/req_command.py", line 180, in wrapper
    return func(self, options, args)
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/commands/install.py", line 404, in run
    pycompile=options.compile,
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/req/__init__.py", line 90, in install_given_reqs
    pycompile=pycompile,
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/req/req_install.py", line 824, in install
    requested=self.user_supplied,
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/operations/install/wheel.py", line 845, in install_wheel
    requested=requested,
  File "/root/code/ggplib/bin/install/_pypy/site-packages/pip/_internal/operations/install/wheel.py", line 719, in _install_wheel
    assert os.path.exists(pyc_path)
AssertionError

在多方查阅资料后，得知这个可能需要使用python3进行安装（这个虚拟环境是python2.7的），故运行以下指令后成功安装twist。

解决方案 

python3 -m pip install twisted