The time I almost broke my Python setup with pip install—what I want to tell my past self who spent six months without knowing about virtual environments

Last week, I had a minor but quietly painful accident. I ran pip install for a new library for Assignment A, and suddenly, the code for Assignment B, which I had finished weeks ago, stopped working.
Ars Technica

installing Python Numpy Package

I was hoping to use Numpy to run some Fortran functions using Python. The unix system admin installed numpy on a different directory than the Python libraries. #!/usr ...