如何從 OSX 中完全刪除 python2，以便 Brew 安裝 NEOVIM 並擁有最新版本的 Python

Question

請包括終端步驟以刪除此 pip 錯誤和 python2

|===> pip install homebrew
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: homebrew in ./Library/Python/2.7/lib/python/site-packages (0.2.1)


|===> pip install homebrew
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: homebrew in ./Library/Python/2.7/lib/python/site-packages (0.2.1)
____________________

|===> brew install neovim
-bash: brew: command not found
____________________

|===> pip install brew
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
Defaulting to user installation because normal site-packages is not writeable
Collecting brew
  Downloading brew-0.1.4.zip (48 kB)
     |████████████████████████████████| 48 kB 386 kB/s 
    ERROR: Command errored out with exit status 1:
     command: /usr/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/0q/n_flnz9j637ds046sshnyvzc0000gp/T/pip-install-K9LQMe/brew/setup.py'"'"'; __file__='"'"'/private/var/folders/0q/n_flnz9j637ds046sshnyvzc0000gp/T/pip-install-K9LQMe/brew/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/0q/n_flnz9j637ds046sshnyvzc0000gp/T/pip-pip-egg-info-jnO1ML
         cwd: /private/var/folders/0q/n_flnz9j637ds046sshnyvzc0000gp/T/pip-install-K9LQMe/brew/
    Complete output (5 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/0q/n_flnz9j637ds046sshnyvzc0000gp/T/pip-install-K9LQMe/brew/setup.py", line 22, in <module>
        with open('requirements.txt') as fid:
    IOError: [Errno 2] No such file or directory: 'requirements.txt'
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

|===> pip uninstall python2
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
WARNING: Skipping python2 as it is not installed.

Answer 1

單獨安裝本機 python2 macos，您的某些系統實用程序可能需要它。
如果需要homebrew安裝python3，請執行以下操作：

macOS 要求

• 一個 64 位 Intel CPU 1
• macOS High Sierra (10.13)（或更高版本）
• Xcode 的命令行工具 (CLT)： xcode-select --install, developer.apple.com/downloads or Xcode
• 用於安裝的 Bourne 兼容 shell（例如 bash 或 zsh）

然后，在命令行上：

如圖所示在這里：

 $ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

或按照那里的建議：

mkdir homebrew && curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C homebrew

安裝homebrew后，您可以brew install python3 ，如解釋here

筆記：

pip install homebrew將安裝Python包管狀的，你可以從蟒蛇進口。 IDK 那個包是做什么的，但很有可能它是一個使用 python 來幫助生成brew installable應用程序的實用程序 - 可能不是你想要的！