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euler-010.py

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+#The sum of the primes below 10 is 2+3+5+7=17
+#Find the sum of all the primes below two million
+
+pmax = 2000000
+
+#checks if integer is prime
+def isprime(x):
+	"Check if integer x is prime, return True or False"
+	if x == 2:
+		return True
+	elif x < 2 or not x & 1:
+		return False
+	for i in range(3, int(x**0.5)+1, 2):
+		if x%i == 0:
+			return False
+	return True
+
+#store all the primes below pmax as a list
+primelist = filter(isprime, range(1,pmax))
+
+#sum all the primes in the list
+psum = 0
+for i in primelist:
+	psum += int(i)
+
+print('The sum of all the primes below two million is', psum)
+
+#Answer: 142913828922