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如何修复更新的 pip：RuntimeError：需要 Python 3.5 或更高版本

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如何修复更新的 pip：RuntimeError：需要 Python 3.5 或更高版本

我在 Ubuntu 14.04 上更新了 pip，pip install pip --upgrade但现在它坏了，说它需要 Python 3.5 或更高版本，但我有 Python 3.4。

我需要重新安装哪些软件包来修复 pip？

$ pip3 search youtube-dl
Traceback (most recent call last):
  File "/usr/local/bin/pip3", line 7, in <module>
    from pip._internal.cli.main import main
  File "/usr/local/lib/python3.4/dist-packages/pip/_internal/cli/main.py", line 10, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/usr/local/lib/python3.4/dist-packages/pip/_internal/cli/autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/usr/local/lib/python3.4/dist-packages/pip/_internal/cli/main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "/usr/local/lib/python3.4/dist-packages/pip/_internal/cli/cmdoptions.py", line 28, in <module>
    from pip._internal.models.target_python import TargetPython
  File "/usr/local/lib/python3.4/dist-packages/pip/_internal/models/target_python.py", line 4, in <module>
    from pip._internal.utils.misc import normalize_version_info
  File "/usr/local/lib/python3.4/dist-packages/pip/_internal/utils/misc.py", line 20, in <module>
    from pip._vendor import pkg_resources
  File "/usr/local/lib/python3.4/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 92, in <module>
    raise RuntimeError("Python 3.5 or later is required")
RuntimeError: Python 3.5 or later is required


$ python3 --version
Python 3.4.3

$ python
python                                 python2-jsondiff                       python3.4m-config                      python-mkdebian
python2                                python2-jsonpatch                      python3-config                         pythontex
python2.7                              python3                                python3m                               pythontex3
python2.7-config                       python3.4                              python3m-config                        
python2.7-pyrexc                       python3.4-config                       python-config                          
python2-config                         python3.4m                             python-html-css-webkit-hello-world.py 

$ find /usr -maxdepth 4 -iname pip -type d
/usr/lib/python2.7/dist-packages/pip
/usr/lib/python3/dist-packages/pip

答案1

看起来您将 pip 升级到了不支持您的 Python 版本的版本。

卸载pip并重新安装系统pip：

sudo apt purge python-pip python3-pip
sudo rm -rf /usr/local/lib/python2.7/dist-packages/pip
sudo rm -rf /usr/local/lib/python3.4/dist-packages/pip
sudo apt install python-pip python3-pip

别跑pip install pip --upgrade

请注意，您使用的是不受支持的 Ubuntu 版本、不受支持的 Python 版本（如果是 Python 2）和几乎不受支持的 Python（3.4 EOL 2020 年 6 月）。您应该考虑升级到较新的 LTS。Ubuntu 16.04 会更进一步，18.04 会更好，或者等到下个月的 20.04。它们都带有现代 Python 3，并且从 18.04 开始默认不安装 Python 2。

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