mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
39 lines
621 B
Python
39 lines
621 B
Python
|
from __future__ import print_function
|
||
|
|
from math import sqrt
|
||
|
|
|
||
|
|
try:
|
||
|
|
xrange #Python 2
|
||
|
|
except NameError:
|
||
|
|
xrange = range #Python 3
|
||
|
|
|
||
|
|
def is_prime(n):
|
||
|
|
for i in xrange(2, int(sqrt(n))+1):
|
||
|
|
if n%i == 0:
|
||
|
|
return False
|
||
|
|
|
||
|
|
return True
|
||
|
|
|
||
|
|
def sum_of_primes(n):
|
||
|
|
if n > 2:
|
||
|
|
sumOfPrimes = 2
|
||
|
|
else:
|
||
|
|
return 0
|
||
|
|
|
||
|
|
for i in xrange(3, n, 2):
|
||
|
|
if is_prime(i):
|
||
|
|
sumOfPrimes += i
|
||
|
|
|
||
|
|
return sumOfPrimes
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
import sys
|
||
|
|
|
||
|
|
if len(sys.argv) == 1:
|
||
|
|
print(sum_of_primes(2000000))
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
n = int(sys.argv[1])
|
||
|
|
print(sum_of_primes(n))
|
||
|
|
except ValueError:
|
||
|
|
print('Invalid entry - please enter a number.')
|