mac命令行切换python版本

brew安装anaconda3

brew cask install anaconda3

安装之后打开路径查看：/usr/local/anaconda3/bin

anaconda3环境变量设置

vim ~/.zshrc

export path=/usr/local/anaconda3/bin:$path

source ~/.zshrc

验证

conda --version
# 看到版本好就成功了

安装双版本

conda create --name python2 python=2.7

conda create --name python3 python=3.7

查看目录 /usr/local/anaconda3/envs/

命令后切换python环境

# 查看本地的py环境
➜  ~ conda info -e
# conda environments:
#
base                  *  /usr/local/anaconda3
python2                  /usr/local/anaconda3/envs/python2
python27                 /usr/local/anaconda3/envs/python27
python3                  /usr/local/anaconda3/envs/python3

# 进入py版本
➜  ~ source activate python27
(python27) ➜  ~

# 退出py版本
conda deactivate

pip

进入py版本之后，有时候不知道pip把安装包安装到哪里了，用这个方法很好使：

(python27) ➜  ~ python
python 2.7.18 |anaconda, inc.| (default, apr 23 2020, 17:44:47)
[gcc 4.2.1 compatible clang 4.0.1 (tags/release_401/final)] on darwin
type "help", "copyright", "credits" or "license" for more information.

>>> import requests
>>> requests
<module 'requests' from '/usr/local/anaconda3/envs/python27/lib/python2.7/site-packages/requests/__init__.pyc'>

/usr/local/anaconda3/envs/python27/lib/python2.7/site-packages/requests/ 就是了。

ide vscode set

参考