puritanical functional code to avoid deep nesting

# for https://chat.stackoverflow.com/transcript/message/51671357#51671357

def looper():
    def lst1_func():
        nonlocal i1, a, b, c, d
        # do stuff

    def lst2_func():
        nonlocal i2, a, b, c, d
        # do stuff

    # def lst3_func, lst4_func here

    triplets = [(lst1, lst1_func, lambda x: x.upper() in bar),
                (lst2, lst2_func, lambda x: x in foo),
                (lst3, lst3_func, lambda x: x),
                (lst4, lst4_func, lambda x: x not in lst1),
    ]

    for lst, func, condition in triplets:
        for item in lst:
            if condition(item):
                return
            func()

    print('Never broke')


looper()