> I should be able to have one of my project's dependencies depend on "numpy==1.15" and another dependency depend on "numpy==1.16" and they should be able to co

> I should be able to have one of my project's dependencies depend on "numpy==1.15" and another dependency depend on "numpy==1.16" and they should be able to coexist in the SAME environment Now I see what people at one respectable, big project were thinking when they allowed 7 different versions of OpenSSL to be statically linked to the same executable… Seriously, this idea may save you from some not very interesting work, but it will create the need of much bigger amount of work which while potentially interesting is not very productive. You are toying with exponential growth here, like a chain reaction - like a bomb.