I used pyenv, pyenv-virtualenv for managing python virtual environment.
I have a project working in Python 3.4 virtual environment.
So all installed packages(pandas, numpy etc) are not newest version.
What I want to do is to upgrade Python version from 3.4 to 3.6 as well as upgrade other package version to higher one.
How can I do this easily?
Use pip freeze > requirements.txt to save a list of installed packages.
Create a new venv with python 3.6.
Install saved packages with pip install -r requirements.txt. When pip finds a universal wheel in its cache it installs the package from the cache. Other packages will be downloaded, cached, built and installed.