![]() ![]() You will always need to re-install packages for a new installation. One thing to remember is that Python installations are entirely separate on Windows, regardless of whether you install Python 2.7 and Python 3.7 "normally", or clone them with virtual environments (as detailed in the other answers to this question). Similarly, numpy can be re-installed in Python 2.7 as in 3.7. Pip should come with the Windows Python 2.7 installer (above), but you can always use pip-get.py. When I originally installed pip and numpy, it was through Python 3.7. Other than that, there should be no issues with running 2.7 and 3.7 side-by-side. You likely won't want to add 2.7 to your System Path during installation unless you want python (2.7) to replace python (3.7) at the command line. ![]() On Windows, you can manually install the latest version of Python 2.7 (which is currently Python 2.7.16) from. I need to know how I can switch the installation to Python 2.7.
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