pyenv：没有这样的命令`virtualenv'

Question

我正在遵循关于在 ubuntu 20.04 上设置 torch 的 tutorial ，一行需要设置

pyenv

，这就像 python 的 virtualenv ，这样我就可以运行多个版本的 python 。有点不必要，但这是一个学习过程，也是学习我改天可能会使用的另一个新工具的好机会。

所以成功设置 pyenv 后这个命令失败了

sam@sam:~/torch$ pyenv virtualenv 3.8.2 torch
pyenv: no such command `virtualenv'

所以为了涵盖我的基础知识，我已经安装了 virtualenv，如下所示

sam@sam:~/torch$ virtualenv
usage: virtualenv [--version] [--with-traceback] [-v | -q] [--app-data APP_DATA] [--clear-app-data] [--discovery {builtin}] [-p py] [--creator {builtin,cpython3-posix,venv}] [--seeder {app-data,pip}] [--no-seed]
                [--activators comma_sep_list] [--clear] [--system-site-packages] [--symlinks | --copies] [--download | --no-download] [--extra-search-dir d [d ...]] [--progress version] [--retrying version] [--urllib3 version]
                [--pep517 version] [--colorama version] [--CacheControl version] [--certifi version] [--requests version] [--contextlib2 version] [--appdirs version] [--chardet version] [--pytoml version] [--html5lib version]
                [--lockfile version] [--six version] [--webencodings version] [--pyparsing version] [--setuptools version] [--packaging version] [--wheel version] [--ipaddr version] [--idna version] [--pip version] [--distro version]
                [--pkg_resources version] [--distlib version] [--msgpack version] [--no-progress] [--no-retrying] [--no-urllib3] [--no-pep517] [--no-colorama] [--no-CacheControl] [--no-certifi] [--no-requests] [--no-contextlib2]
                [--no-appdirs] [--no-chardet] [--no-pytoml] [--no-html5lib] [--no-lockfile] [--no-six] [--no-webencodings] [--no-pyparsing] [--no-setuptools] [--no-packaging] [--no-wheel] [--no-ipaddr] [--no-idna] [--no-pip] [--no-distro]
                [--no-pkg_resources] [--no-distlib] [--no-msgpack] [--symlink-app-data] [--prompt prompt] [-h]
                dest
virtualenv: error: the following arguments are required: dest

并且 pyenv 已安装，如下所示

sam@sam:~/torch$ pyenv
pyenv 1.2.19-1-gece59ca8
Usage: pyenv <command> [<args>]

Some useful pyenv commands are:
commands    List all available pyenv commands
exec        Run an executable with the selected Python version
global      Set or show the global Python version(s)
help        Display help for a command
hooks       List hook scripts for a given pyenv command
init        Configure the shell environment for pyenv
install     Install a Python version using python-build
local       Set or show the local application-specific Python version(s)
prefix      Display prefix for a Python version
rehash      Rehash pyenv shims (run this after installing executables)
root        Display the root directory where versions and shims are kept
shell       Set or show the shell-specific Python version
shims       List existing pyenv shims
uninstall   Uninstall a specific Python version
--version   Display the version of pyenv
version     Show the current Python version(s) and its origin
version-file   Detect the file that sets the current pyenv version
version-name   Show the current Python version
version-origin   Explain how the current Python version is set
versions    List all Python versions available to pyenv
whence      List all Python versions that contain the given executable
which       Display the full path to an executable

See `pyenv help <command>' for information on a specific command.
For full documentation, see: https://github.com/pyenv/pyenv#readme

Answer 1

这已在您的评论下的线程中讨论过，但您需要 pyenv-virtualenv。

如何下载：https://github.com/pyenv/pyenv-virtualenv

简单的方法是通过 Mac 上的自制程序

brew install pyenv-virtualenv

Answer 2

注意：如果在 Windows 操作系统上，您可以使用此：

https://python.land/virtual-environments/virtualenv