pip install -r

引用\[2\]:pip install -r requirements.txt # 安装1.9版本的django pip install django==1.9 # 安装版本号大于1.9的django，注意有引号 pip install "django>1.9" pip install "django>=1.9" pip install "django<1.9" pip install "django<=1.9" pip install "django><1.9"。

问题: pip install -r requirements.txt 是什么意思？
回答: pip install -r requirements.txt 是用来安装一个项目所需的所有依赖包的命令。通过在命令行中运行这个命令，pip会根据 requirements.txt 文件中列出的包名和版本号来自动安装这些依赖包。\[2\]
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