nums = set(range(2,20))
comps = {j for i in nums for j in range(i*i, 20, i)}
print(comps)
primes = nums - comps
print(primes)
def f(val, lst=[]):
lst.append(val)
return lst
print(f(1))
print(f(2, []))
print(f(3)){4, 6, 8, 9, 10, 12, 14, 15, 16, 18}
{2, 3, 5, 7, 11, 13, 17, 19}
[1]
[2]
[1, 3]
def f(val, lst=[]):
lst.append(val)
return lst
print(f(1))
print(f(2, []))
print(f(3))[1]
[2]
[1, 3]