# how to print sum of primes in a list in python?

67
February 11, 2019, at 7:20 PM

How do I print sum of primes in a list in Python?

``````def prime(n):
i = 2
c = 0
for i in range(1,n+1):
if(n%i == 0):
c = c+1
if(c == 2):
return True
else:
return False

def sumprimes(l1):
l1 = []
l = len(l1)
i = 0
sum = 0
for i in range(0,l):
if(prime(l1[i]) is True):
sum = sum +l1[i]
print(sum)
l1 = [3,4,5,6]
print(sumprimes(l1))
``````

Output should be equal to 8.

``````def prime(n):
i = 2
c = 0
for i in range(1,n+1):
if(n%i == 0):
c = c+1
if(c == 2):
return True
else:
return False

def sumprimes(l1):
sum=0
for x in l1:
if prime(x):
sum += x
return sum
l1 = [3,4,5,6]
print(sumprimes(l1))
``````

Use the above code. You need to use the return statement to print the result of a function. And there is no need for your range() loop, there is a more elegant way to do this in python, use a for loop over all elements of the list.

You can do it using below code too.

``````lst = [1,2,5,7,9,10,12]
def isPrime(x):
if x == 1:
return False
for i in range(2,x-1):
if x%i == 0:
return False
return True

def getPrimeSum(l):
l = [i for i in l if isPrime(i)]
return sum(l)
print(getPrimeSum(lst))
``````
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