new syntax for looping n times without needing a variable

[BaddRadish]

suppose you want to do something n times, but dont need to track how many times you've done it.
currently the syntax is for _n in n: or maybe for _n in range(n) not sure.

how about for n:?

[dalexeev]

See #1282.

[Calinou]

This is being tracked in #1282.