Migrate all python2 packages to python3 with pip

Question

I have been using Python2 and pip for a long time and recently installed Python3 and pip3. I want to migrate all pip packages to pip3. How to install all the package at one go?

Since my pip list shows a long list of packages installed using pip, it is very hectic to install them one by one using pip3.

Answer 1

假设您要为python3安装所有python2软件包，请使用

$ pip3 install --user `pip freeze`  

Answer 2

首先，使用pip freeze > requirements.txt pip3 install -r requirements.txt pip freeze > requirements.txt保存所有软件包，然后运行pip3 install -r requirements.txt