Use `is` for `len()` conditionals
Use `is` for `len()` conditionals

Since numbers are constants and `len()` always returns a number, it’s safe to use `is` over `==`.

Supposedly it’s a teeny-tiny bit more efficient, too.

I will leave the final judgement to you, O master of asynchronous alacrity…

marcelometal/pyvows,heynemann/pyvows