Python 虛擬環境架設

參考連結

1. 通過 venv 來創造一個虛擬環境:

python -m venv <YOUR-PATH>

venv 參數介紹:

usage: venv [-h] [--system-site-packages] [--symlinks | --copies] [--clear] [--upgrade] 
            [--without-pip] [--prompt PROMPT] ENV_DIR [ENV_DIR ...]

Creates virtual Python environments in one or more target directories.

positional arguments:
  ENV_DIR               A directory to create the environment in.

optional arguments:
  -h, --help            show this help message and exit
  --system-site-packages
                        Give the virtual environment access to the system site-packages dir.
  --symlinks            Try to use symlinks rather than copies, when symlinks are 
                        not the default for the platform.
  --copies              Try to use copies rather than symlinks, even when symlinks are 
                        the default for the platform.
  --clear               Delete the contents of the environment directory if it already exists, 
                        before environment creation.
  --upgrade             Upgrade the environment directory to use this version of Python, 
                        assuming Python has been upgraded in-place.
  --without-pip         Skips installing or upgrading pip in the virtual environment (pip is bootstrapped by default)
  --prompt PROMPT       Provides an alternative prompt prefix for this environment.

Once an environment has been created, you may wish to activate it, e.g. by sourcing an activate script in its bin directory.

2. 進入/離開虛擬環境

進入虛擬環境:

source <YOUR-PATH>/bin/activate

離開虛擬環境:

deactivate

3. 安裝所需 packages

可先寫好 requirements.txt，直接打:

pip install -r requirements.txt

requirements.txt 寫法:

--find-links https://download.pytorch.org/whl/torch_stable.html
matplotlib
numpy
torch==1.10.0+cu113 
torchvision==0.11.1+cu113 
torchaudio===0.10.0+cu113
torchsummary

4. 刪除虛擬環境

直接刪除資料夾即可:

rm <YOUR-VENV> -rf

P.S. 輸出當前的 pip packages 到 requirements.txt

pip freeze > requirements.txt