[mamcx]

In the same world is easier to understand for advanced developers.

You know n is a number and the result is a number. You don't need to "type check in your head".

Remember Pascal? Being explicit is good for education and for regular sanity.

P.D: I like python very much, but all the time I'm wondering "ok, what is the meaning of this code, let's find elsewhere so I can remember what is supposed this return"

This also happens to me with F# (type inference is weird: The compiler know, but it hide to me what it know!).

[AstralStorm]

Use IDE which runs type inference like the compiler when that's a problem. Can't do it in Python though.

[skrishnamurthi]

Programmers use a variety of editors these days. They often don't want to be locked down to one single IDE. So "let the IDE do it" is not a universally satisfying answer either.