CODEWITHSUNDEEP
pythonloopsfor-loopprimes
Mohammad Areeb Siddiqui
Mohammad Areeb Siddiqui

Reputation: 10179

Run a loop again

I am trying to rerun a loop in python when it's on the last iteration but it's not working. Here's my code:

primes = [i for i in range(2, 1001)]
p = 2
for i in range(p, len(primes), p):
    primes[i] = 0
    if i == len(primes)-1 and (p+1) <= max(primes):
        p += 1
        print(p)
print(primes)

The code only runs once as the print(primes) shows that every 2nd value is made 0. I want it to rerun until p is not equal to the maximum value in the list.

Upvotes: 0

Views: 117

Answers (1)

Hugh Bothwell
Hugh Bothwell

Reputation: 56654

primes = [2, 3]
upto = 1000
for num in range(4, upto+1):
    if all(num % p for p in primes):
        primes.append(num)

print(primes)

Note that this could still be improved by not testing for division by primes > sqrt(num)

Upvotes: 2

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