Refactor code, make it more python and squeeze out small performance gains.

[Uzaaft]

Original issue was #25. Scope of this PR:

• Migration to comprehensions
• Move to literals instead of list() and dict()
• Use if-expressions
• Use yield from instead of yield

[Uzaaft]

Reason for eb4cbac:

Simple microbenchmark, but:

[Uzaaft]

Microbenchmark for e287123:

[Uzaaft]

@niemasd Ready for initial review.

I've got additional changes that I want to run by you, for.example the usage of if-expressions:

Instead of

There is also a few variable assignments that should be changes. For.example the usage of all and next, as these are built in variables/functions into python.

[Uzaaft]

@niemasd Ready for initial review.

I've got additional changes that I want to run by you, for.example the usage of if-expressions:

Instead of

There is also a few variable assignments that should be changes. For.example the usage of all and next, as these are built in variables/functions into python.

What about the changes proposed here? @niemasd

[niemasd]

Ah, sorry, I missed that! Yes, both ideas (1: using if-else variable assignment expressions, and 2: renaming variables whose names conflict with built-in Python variables/functions/keywords) sound great!