步骤1：导出依赖

首先在当前环境下安装：pip install pipreqs，这个库可以帮助你筛选出项目需要的python包，而不是当前环境的全部依赖。安装完成后使用命令：

cd 项目根目录/
pipreqs ./ --encoding=utf-8

在根目录下会生成requirements.txt文件，我的内容如下：

itemadapter==0.1.0
selenium==3.141.0
Scrapy==2.3.0
python_dateutil==2.8.2
........

步骤2：离线下载依赖包

然后根据requirements.txt导出需要的安装包

pip download -d PIPDIR -r requirements.txt -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com

-d指定导出的文件夹
-r指定根据哪一个文件导出
-i表示使用阿里源(当然可以使用其他国内源啊)
--trusted-host表示信任主机
更多配置请参考：https://pip.pypa.io/en/stable/cli/pip_download/#options

有几个常用配置：

–platform：指定需要安装的平台，比如：linux_x86_64，如果在windows/mac上默认会下载windows/mac的安装包，在linux上是肯定安装不了的
–python-version：python的版本，默认与当前环境相同，如果值为3，则python版本为3.0.0, 若值为3.7，则python版本为3.7.0或3.7.3，最好根据python --version指定完整的版本号

注意：这里一定要添加--trusted-host，否则会报错：

WARNING: The repository located at mirrors.aliyun.com is not a trusted or secure host and is being ignored. If this repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence this warning and allow it anyway with '--trusted-host mirrors.aliyun.com'.
ERROR: Could not find a version that satisfies the requirement xxx==xxx (from versions: none)
ERROR: No matching distribution found for xxx==xxx

步骤3：进入新环境使用python安装依赖

根据自己的实际情况，把这个文件夹和requirements.txt移动到新的环境中，然后使用：

pip install --no-index --find-links=PIPDIR -r requirements.txt

--find-links就是存放安装文件的目录
-r是指按照requirements.txt这个文件去安装文件目录中找需要的安装包

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python pip下载本地依赖包，并在离线环境中安装，并解决报错ERROR: Could not find a version that satisfies the requirement报错

文章目录

步骤1：导出依赖

步骤2：离线下载依赖包

步骤3：进入新环境使用python安装依赖

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