已将Python 3.9.1安装到MAC OS上，但仍表示Python版本为2.7

我在MacBook上安装了Python3.9.1，但是当我使用命令Python时，它的版本是Python2.7。以下是我的终端中发生的情况，以供参考：

$ python -V
Python 2.7.16
$ brew install pyenv
Updating Homebrew...
==> Auto-updated Homebrew!
Updated Homebrew from 565becc90 to e41981a5c.
Updated 1 tap (homebrew/core).
==> New Formulae
htmltest                   mpdecimal                  vitess
==> Updated Formulae
Updated 158 formulae.

==> Homebrew was updated to version 2.7.7
The changelog can be found at:
  https://github.com/Homebrew/brew/releases/tag/2.7.7
Warning: pyenv 1.2.22 is already installed and up-to-date.
To reinstall 1.2.22, run:
  brew reinstall pyenv
$ pyenv install 3.9.1
python-build: use openssl@1.1 from homebrew
python-build: use readline from homebrew
Downloading Python-3.9.1.tar.xz...
-> https://www.python.org/ftp/python/3.9.1/Python-3.9.1.tar.xz
Installing Python-3.9.1...
python-build: use readline from homebrew
python-build: use zlib from xcode sdk
       
Installed Python-3.9.1 to /Users/myname/.pyenv/versions/3.9.1

$ 
$ python --version
Python 2.7.16

---

提前感谢您的帮助

您必须将

/usr/local/opt/python/libexec/bin

添加到

路径中

签出尝试
python3
或
python3.9
！非常感谢！