Debian装Python模块？pip一招搞定，别让依赖卡死你

系统安装模块的常用方法

1. 准备工作：更新系统并安装基础工具

在进行模块安装以前, 建议先对系统包列表予以更新, 以此保证后续所安装的依赖项属于最新版本。与此同时, 需要安装3跟与之对应的包管理工具pip（也就是3的模块管理工具）。执行如下命令:

sudo apt update # 更新系统包列表
sudo apt install python3 python3-pip # 安装Python 3及pip

安装完成后，通过以下命令验证版本（确认安装成功）：

python3 –version # 查看Python 3版本
pip3 –version # 查看pip3版本

2. 使用pip安装模块（推荐方式）

pip乃是官方所推荐的包管理工具, 它能够自动去解决模块依赖关系, 此种工具的安装过程十分简便；比如说在安装（HTTP请求库）的时候, 需要执行以下这般命令:

pip3 install requests # 全局安装requests模块

假设需要做安装特定版本的模块这件事, 比如说numpy等于1.21.0这个版本, 那么能够借助==来把版本号给指定出来:

pip3 install numpy==1.21.0

验证进行安装操作, 把解释器予以打开, 试着去导入模块, 且去查看版本, 就是以numpy作为例子。

python3 -c "import numpy; print(numpy.__version__)" # 输出模块版本

3. 使用APT安装系统级模块

其软件仓库以内预先编译好了好多常用模块（像、之类）, 借由APT来展开安装能够躲开手动去编译依赖情况, 适用于系统级别的应用。在安装之前要借助apt-cache去查找模块所对应的包名（拿mysql相关模块当作例子）:

apt-cache search mysql | grep python # 查找MySQL相关Python模块

找到目标模块后（如-），执行以下命令安装：

sudo apt install python3-mysqldb # 安装Python 3的MySQL模块

安装完成后，可直接在中导入使用：

python3 -c "import MySQLdb; print(MySQLdb.__version__)" # 验证MySQL模块

4. 使用虚拟环境隔离项目依赖（最佳实践）

要防止因进行全局安装致使模块版本出现冲突, 像是项目A所需要的是3.x版本, 而项目B所需要的是4.x版本这种情况, 提议运用venv模块去创建虚拟环境。其操作步骤如下: 其操作步骤如下:

python3 -m venv myenv # 创建名为myenv的虚拟环境
source myenv/bin/activate # 激活虚拟环境（激活后命令行前会显示(myenv)）
pip install flask # 在虚拟环境中安装flask模块
deactivate # 退出虚拟环境（输入deactivate即可）

在虚拟环境里的模块, 仅仅于当下这个环境当中才具备有效性, 它是不会对系统造成影响的, 也不会波及其他项目。

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