Reintroduce Else

Sourcery refactoring id: reintroduce-else

Description:

Lift code into else after break in control flow

Before:

summer_hats = []
for hat in hats:
    if hat in WINTER_HATS:
        continue
    summer_hats.append(hat)

After:

summer_hats = []
for hat in hats:
    if hat in WINTER_HATS:
        continue
    else:
        summer_hats.append(hat)

Explanation:

Where the body of an if statement ends with a break in the control flow, such as a continue, return or raise, the subsequent statements can be lifted into the else clause. On its own this change does not improve the code, so Sourcery will only suggest it where it unlocks furher improvements. In the example above once the code has been lifted into the else the conditional can be inverted and the continue removed, which then lets the for loop be converted into a list comprehension.