python——venv虚拟环境

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Python的venv模块提供了一种方便的方式来创建隔离的Python环境，避免包版本冲突。通过`python3 -m venv env_name`创建虚拟环境，激活环境后，可以使用`pip freeze > requirements.txt`记录依赖，并用`pip install -r requirements.txt`安装。关闭终端或运行`deactivate`会退出虚拟环境。此外，`activate`脚本用于环境切换，`VIRTUAL_ENV`变量指示当前环境路径。

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python——venv虚拟环境

当进行复杂工程的时候，不同版本的包管理总成为基础又让人头疼的事情
“在 Linux 下使用 Python，我对各种版本的 python 解释器、pip 以及 N 多 python 包都产生了恐惧”

故可通过虚拟环境来解决问题

python 自带虚拟环境创建工具
or apt-get install python3-venv
```
python -m venv 虚拟环境名
```

cd 11_env\Scripts 
activate
#activate.bat
#激活虚拟环境 (deactice停止)
#如果关闭运行虚拟环境的终端，虚拟环境也将不再处于活动状态

不同平台

每一个虚拟环境都有其自己的 Python 二进制（允许有不同的 Python 版本创作环境），并且可以拥有自己独立的一套 Python 包。

到处当前所有依赖

pip freeze > requirements.txt
pip install -r requirements.txt

if [ -f requirements.txt ]; then pip install -r requirements.txt; fi #不太懂

附：

#active.bat

# This file must be used with "source bin/activate" *from bash*
# you cannot run it directly

deactivate () {
    # reset old environment variables
    if [ -n "${_OLD_VIRTUAL_PATH:-}" ] ; then
        PATH="${_OLD_VIRTUAL_PATH:-}"
        export PATH
        unset _OLD_VIRTUAL_PATH
    fi
    if [ -n "${_OLD_VIRTUAL_PYTHONHOME:-}" ] ; then
        PYTHONHOME="${_OLD_VIRTUAL_PYTHONHOME:-}"
        export PYTHONHOME
        unset _OLD_VIRTUAL_PYTHONHOME
    fi

    # This should detect bash and zsh, which have a hash command that must
    # be called to get it to forget past commands.  Without forgetting
    # past commands the $PATH changes we made may not be respected
    if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then
        hash -r
    fi

    if [ -n "${_OLD_VIRTUAL_PS1:-}" ] ; then
        PS1="${_OLD_VIRTUAL_PS1:-}"
        export PS1
        unset _OLD_VIRTUAL_PS1
    fi

    unset VIRTUAL_ENV
    if [ ! "${1:-}" = "nondestructive" ] ; then
    # Self destruct!
        unset -f deactivate
    fi
}

# unset irrelevant variables
deactivate nondestructive

VIRTUAL_ENV="C:\Users\K\Desktop\randomFoder\bashGivUpRemote\re"
export VIRTUAL_ENV

_OLD_VIRTUAL_PATH="$PATH"
PATH="$VIRTUAL_ENV/Scripts:$PATH"
export PATH

# unset PYTHONHOME if set
# this will fail if PYTHONHOME is set to the empty string (which is bad anyway)
# could use `if (set -u; : $PYTHONHOME) ;` in bash
if [ -n "${PYTHONHOME:-}" ] ; then
    _OLD_VIRTUAL_PYTHONHOME="${PYTHONHOME:-}"
    unset PYTHONHOME
fi

if [ -z "${VIRTUAL_ENV_DISABLE_PROMPT:-}" ] ; then
    _OLD_VIRTUAL_PS1="${PS1:-}"
    if [ "x(re) " != x ] ; then
	PS1="(re) ${PS1:-}"
    else
    if [ "`basename \"$VIRTUAL_ENV\"`" = "__" ] ; then
        # special case for Aspen magic directories
        # see http://www.zetadev.com/software/aspen/
        PS1="[`basename \`dirname \"$VIRTUAL_ENV\"\``] $PS1"
    else
        PS1="(`basename \"$VIRTUAL_ENV\"`)$PS1"
    fi
    fi
    export PS1
fi

# This should detect bash and zsh, which have a hash command that must
# be called to get it to forget past commands.  Without forgetting
# past commands the $PATH changes we made may not be respected
if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then
    hash -r
fi

#tree v-env
├─Include
├─Lib
└─Scripts