Programming

Python 10s of multiples more CPU cycles than git. It is an interpreted language: every instruction is read by another process, checked, and then run. Hit on the other hand is executed straight by the CPU. It has at least one layer of indirection less than python (the python interpreter may have multiple). That means it can be slower but it definitely uses more energy.

Since git is so popular, if it were instead mercurial, the energy requirements would be much higher for version control. Whether that will be noticeable on a bill is debatable. I haven't run the numbers.

Regarding the different python versions. As mentioned before, there is a python interpreter. That interpreter is versioned and so is the python language. Many things are backwards compatible meaning something written in a higher version of the python language can be interpreted by a lower version of the python interpreter. The reverse is also true, so python interpreter with a higher version can interpret a python file using a lower version of the language.

Notice that I put "can" in bold. That's because newer versions can deprecate certain features or parts of the language. So, if you're writing a project in a different version of python, mercurial may or may not run depending on your version. Resolving that may not be as intuitive as one thinks.

I think those were he points you were referring to when you asked your question?

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