gistfile1.py

list_a = [1, 2, 3]
list_b = ['hello', 'world']

conditionA = True
conditionB = True

def inner_loop(func):
    for j in list_b:
        func(j)
        #do sth in list_b


if (conditionA):
    for i in list_a:
        # do sth in list_a
        print('i: {}'.format(i))
        inner_loop(lambda s: print('A: {}'.format(s)))

print('\n')
        
if (conditionB):
    inner_loop(lambda s: print('B: {}'.format(s)))