已安装pipenv，但$ pipenv --version显示为找不到命令

Question

这里的新手不了解pipenv如何同时显示已安装和未同时安装。我正在VS Code终端中使用Windows 10（2004）：

$ pip install pipenv返回此：

Requirement already satisfied: pipenv in c:\users\billa\appdata\roaming\python\python37\site-packages (2018.11.26)
    Requirement already satisfied: virtualenv-clone>=0.2.5 in c:\users\billa\appdata\roaming\python\python37\site-packages (from pipenv) (0.5.3)
    Requirement already satisfied: certifi in c:\users\billa\appdata\local\programs\python\python37\lib\site-packages (from pipenv) (2019.6.16)
    Requirement already satisfied: virtualenv in c:\users\billa\appdata\local\programs\python\python37\lib\site-packages (from pipenv) (16.7.7)
    Requirement already satisfied: setuptools>=36.2.1 in c:\users\billa\appdata\local\programs\python\python37\lib\site-packages (from pipenv) (44.0.0)
    Requirement already satisfied: pip>=9.0.1 in c:\users\billa\appdata\local\programs\python\python37\lib\site-packages (from pipenv) (20.1.1)

但是：

$ pipenv --version

返回此：

$ pipenv: command not found

令人困惑的是，如果我在Windows终端中使用Ubuntu，它会正确返回报告： $ pipenv, version 2020.6.2

谢谢。