def f1(lst):
    while lst:
        if lst.pop(0) > 0:
            return map(lambda x: x-0.5, lst)
            
def f2(num):
    out = []
    for i in range(1, num):
        if not num % i**2 and num % i**3:
            out.append(i)
    return out
print f1(range(-7, 30))
print f2(100)