How do I find the sum of prime numbers in a given range in Python 3.5?

Question

I managed to create a list of prime numbers in a given range using this:

import numpy as np  

num = int(input(\"Enter a number: \"))  

for a in range(2,num         


        

Answer 1

In your case, a is an integer variable being used in your loop, not an iterable.

import numpy as np

num = int(input("Enter a number: "))

primes = []

for a in range(2,num+1):

  maxInt= int(np.sqrt(a)) + 1

  for i in range(2,maxInt):

    if (a%i==0):
      break

  else:
    primes.append(a)

print(sum(primes))

So if we just append them to a list as we go instead of printing them, we get the following output when taking the sum of the list primes.

Enter a number: 43
281