Eratosthenes sieve

eratosthenes.py

def Era(number):
    pres_num = int(number ** 0.5)
    for i in range(1, pres_num):
        if Divide(number, i+1):
            return True
    return False


def Divide(number, factor):
    if number % factor == 0:
        return True
    else:
        return False


for i in range(1, 20):
    print(i, str(Era(i)))