Python 记一次更新 pip 失败

背景

看到 warning 有点不舒服，便更新了一下 pip：

(base) C:\Users\Administrator>pip install --upgrade pip
Requirement already satisfied: pip in d:\anaconda3\lib\site-packages (21.0)
Collecting pip
  Downloading pip-21.0.1-py3-none-any.whl (1.5 MB)
     |████████████████████████████████| 1.5 MB 242 kB/s
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 21.0
    Uninstalling pip-21.0:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] 拒绝访问。: 'd:\\anaconda3\\scripts\\pip.exe'
Consider using the `--user` option or check the permissions.

因为权限问题导致未能成功更新 pip，而导致此时 pip 已经有所残缺，无法正常使用了。

(base) C:\Users\Administrator>pip install --upgrade pip
Script file 'D:\Anaconda3\Scripts\pip-script.py' is not present.

解决 'pip-script.py' is not present.：重新安装 pip

Windows

下载并运行安装脚本：

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py

• linux 需要使用 sudo 执行安装脚本：sudo python get-pip.py
• pip 会被安装到当前解释器环境中。

(base) C:\Users\Administrator>curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1882k  100 1882k    0     0   174k      0  0:00:10  0:00:10 --:--:--  104k

(base) C:\Users\Administrator>python get-pip.py
Collecting pip
  Using cached pip-21.0.1-py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.3.3
    Uninstalling pip-20.3.3:
      Successfully uninstalled pip-20.3.3
Successfully installed pip-21.0.1

Debian 和 Ubuntu 等

部分 Linux 发行版可直接用包管理器安装 pip，如 Debian 和 Ubuntu：

sudo apt-get install python-pip