How to install python packages from older version to newer version?

问题

i was working with python 3.7 and i installed recently python 3.8 in linux.

Is there any bash command or script that take a list of all packages of 3.7 and install it one by one in 3.8 version.

i want to avoid to do it by hand every package.

Note: i install them in my system not using venv.

Thanks!

回答1:

/path_to_3.7_bin/python -m pip freeze > /home/packages_list.txt

then

/path_to_3.8_bin/python -m pip install -r /home/packages_list.txt

回答2:

try https://pip.pypa.io/en/stable/reference/pip_freeze/

pip freeze > requirements.pip in the old version

pip install -r requirements.pip in the new version

来源：https://stackoverflow.com/questions/58473864/how-to-install-python-packages-from-older-version-to-newer-version