Feature: labeled break and continue statements

[JacobFV]

Are there plans to add support for labeled for, while, break, and continue statements?

Reasons

This feature is primarily intended for correctness' sake, but also convenience.

Correctness: Say I'm refactoring:

while ...:
    # big code block 1
    for ...:
        # big code block 2
        # big code block 3
        break
        # big code block 4

into something like

while ...:
    # big code block 1
    # big code block 3
    break
    # big code block 4

The break statement was intended to only apply to the inner loop, but amidst the KLOC's I accidently left the break statement inside the outer loop. This is not correct. Labeled break's would prevent this issue.

Convenience: I often write small loops to check any possible valid condition and apply this check to an entire sequence. Usually, simplicity requires lifting the entire nested loops into their own function. For example,

"""Checks if a board state ever had a 1 adjacent to the player"""

def readable_check(trajectory):
    for pos, board in trajectory:
        for dir in [N, S, E, W]:
            if board[pos + dir] == 1:
                return True
    return False

trajectory = ...
# check if player was ever touching a 1
check = readable_check(trajectory) # readable, not concise, not inline
check = any(board[pos+dir] == 1 for board in trajectory for pos in [N, S, E, W]) # concise, not super readable, inline

# readable, not concise, inline
check: bool
for pos, board in trajectory:
    for dir in [N, S, E, W]:
        if board[pos + dir] == 1:
            check = True
            break
    if check:
        break
else:
    check = False

Maybe it's just my opinion, but I think labeled breaks and continues would be a more pleasant way to express myself here:

# readable, reasonably-concise, inline
check: bool
trajectory_loop: 
for pos, board in trajectory:
    positions_loop:
    for dir in [N, S, E, W]:
        if board[pos + dir] == 1:
            check = True
            break trajectory_loop
else:
    check = False