One argument that keeps coming up is transferability of knowledge: knowing git and/or GitHub, as many seem to, it
therefore becomes easier to commit to the Python ecosystem.
What about the transferability of Python knowledge? Because I know Python, I can customize hg; because I know Python I
can customize Roundup.
I do not choose tools simply because they are written in Python -- I choose them because, being written in Python, I can
work on them if I need to: I can enhance them, I can fix them, I can learn from them.