Question

尝试使用pip进行安装刚刚安装了另一个版本的python（3.4）得到错误

ImportError: cannot import name '_BACKCOMPAT_MAGIC_NUMBER'

Answer 1

我通过删除旧python版本的tox venv并在安装dev包后重新创建它来解决这个问题。

我做了什么（在Ubuntu 18.04上），从deadsnakes ppa安装旧版本的Python进行测试：

$ sudo add-apt-repository ppa:deadsnakes/ppa
...
 More info: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.
...
$ sudo apt-get install python3.5-dev
...

Reran tox尝试使用Python 3.5进行测试：

$ tox
...
ERROR: invocation failed (exit code 1), logfile: ...
ERROR: actionid: py35
msg: installpkg
...
Traceback (most recent call last):
  File ".../.tox/py35/bin/pip", line 7, in <module>
    from pip import main
  File ".../.tox/py35/lib/python3.5/site-packages/pip/__init__.py", line 26, in <module>
    from pip.utils import get_installed_distributions, get_prog
  File ".../.tox/py35/lib/python3.5/site-packages/pip/utils/__init__.py", line 19, in <module>
    import zipfile
  File "/usr/lib/python3.5/zipfile.py", line 9, in <module>
    import importlib.util
  File ".../.tox/py35/lib/python3.5/importlib/util.py", line 7, in <module>
    from ._bootstrap_external import MAGIC_NUMBER, _BACKCOMPAT_MAGIC_NUMBER
ImportError: cannot import name '_BACKCOMPAT_MAGIC_NUMBER'
...

删除本地tox virtualenv目录并再次运行：

$ rm -rf .tox/py35
$ tox
...
  py35: commands succeeded

Answer 2

就我而言，我使用的是pipenv，解决方法是删除virtualenv并重新安装依赖项：

$ pipenv --rm
$ pipenv install

ImportError：无法导入名称＆＃39; _BACKCOMPAT_MAGIC_NUMBER＆＃39;

2 个答案: