当通过 pip 安装它时（pip install pipenv），在 zsh shell 上找不到命令pipenv.

如果通过安装brew: brew install pipenv，然后运行pipenv shell，出现错误

Loading .env environment variables...
Launching subshell in virtual environment...
Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/bin/pipenv", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/cli/command.py", line 429, in shell
    do_shell(
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/core.py", line 2387, in do_shell
    shell.fork_compat(*fork_args)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/shells.py", line 106, in fork_compat
    c = pexpect.spawn(self.cmd, ["-i"], dimensions=(dims.lines, dims.columns))
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/pexpect/pty_spawn.py", line 205, in __init__
    self._spawn(command, args, preexec_fn, dimensions)
  File "/usr/local/Cellar/pipenv/2020.11.15/libexec/lib/python3.9/site-packages/pipenv/vendor/pexpect/pty_spawn.py", line 276, in _spawn
    raise ExceptionPexpect('The command was not found or was not ' +
pipenv.vendor.pexpect.exceptions.ExceptionPexpect: The command was not found or was not executable: /use/bin/zsh.

没有路径命名/use/bin/zsh。为什么不稳定？

外壳路径是

echo $SHELL
/bin/zsh

你确实在问两个问题。我将在单独的部分中回答每个问题：

如何修复该错误

Loading .env environment variables...
...
The command was not found or was not executable: /use/bin/zsh.

好像in your .env file https://pipenv.pypa.io/en/latest/advanced/#automatic-loading-of-env， 你有PIPENV_SHELL=/use/bin/zsh。这是不正确的。反而，

• 它应该是

  PIPENV_SHELL=/bin/zsh
  

• 或者简单地

  PIPENV_SHELL=zsh
  

• 或者你可以只需将其删除即可。 Then pipenv shell将自动使用与您调用它时相同的 shell。

如何正确安装pipenv在 macOS 上

正确的安装方法pipenv在 macOS 上，这很复杂，但这是在升级 Python 时避免遇到麻烦的唯一方法：

1. 撤消您迄今为止所做的操作：

   % pip uninstall pipenv
   % brew uninstall pipenv
   

2. 添加到您的.zshrc file:

   eval "$( brew shellenv )"
   
   # Set your preferred python version.
   # If you just want the latest release, you don't need to 
   # specify anything more than the major version number.
   export PYENV_VERSION=3
   
   # Tell pyenv where to keep your python installations.
   export PYENV_ROOT=~/.pyenv
   
   # Tell pipx where to install executables.
   # pipx is like brew, but for python.
   export PIPX_BIN_DIR=~/.local/bin
   
   # -U eliminates duplicates.
   export -U PATH path         
   path=( 
       $PIPX_BIN_DIR
       $PYENV_ROOT/{bin,shims} 
       $path
   )
   
   # Installs/updates pipenv and all of its dependencies.
   pybake() {
     # If any commands fail, exit the function.
     setopt LOCAL_OPTIONS ERR_RETURN
   
     install-or-upgrade() {
       print -n ${${$( command -v $1 ):+upgrade}:-install} $1
     }
   
     {
       brew ${=$( install-or-upgrade pyenv )}
       pyenv install --skip-existing $PYENV_VERSION
       pip install --upgrade pip
   
       # --user installs to ~/.local/bin
       pip install --upgrade --user pipx
   
       pipx ${=$( install-or-upgrade pipenv )}
   
     } always {
       unfunction install-or-upgrade
     }
   }
   

3. Run:

   % exec zsh  # Restart your shell.
   % pybake
   

4. 添加到您的.zshrc file:

   eval "$( pyenv init - )"
   eval "$( pip completion --zsh )"
   eval "$( register-python-argcomplete pipx )"
   

5. Run exec zsh再次或打开一个新的终端选项卡。

更新中pipenv

按照上述步骤后，进行更新pipenv，您需要做的就是运行：

```shell
% pybake && exec zsh
```