New Refactorings

Simplify negative list access

This refactoring uses the fact that Python allows negative list indices to be accessed directly.

It converts this:

last_element = a[len(a) - 1]

into this:

last_element = a[-1]

Merge Comparison refactoring extended to the negative case

The merge-comparison proposal will now apply in this case:

if x != a and x != b:
    do_stuff()

This will be converted to:

if x not in [a, b]:
    do_stuff()

Bug fixes

• Ensure statements that write global state can't be hoisted out of loops (e.g. function calls)
• Do not try to remove pass statements at class level
• Do not wrap the targets of annotated assignments in brackets