prime numbers generator

prime.py

#A python script to generate prime numbers


def getfactors(n):
    factors = []
    for num in range(1,n+1):
        if n%num == 0:
            factors.append(num)
    return factors

def isitprime(n):
    return len(getfactors(n)) == 2

def getprimes(r):
    primes=[]
    for n in range(1,r):
        if isitprime(n) == True:
            primes.append(n)
    return primes

print(getprimes(100))