Added Even Fibonacci Number Program

even_fibonacci.py

@@ -0,0 +1,38 @@
+# Find the sum of all the even-valued  
+# terms in the Fibonacci sequence which  
+# do not exceed given limit. 
+
+# Returns sum of even Fibonacci numbers which 
+# are less than or equal to given limit. 
+def evenFibSum(limit) : 
+    if (limit < 2) : 
+        return 0
+
+    # Initialize first two even prime numbers 
+    # and their sum 
+    ef1 = 0
+    ef2 = 2
+    sm= ef1 + ef2 
+
+    # calculating sum of even Fibonacci value 
+    while (ef2 <= limit) : 
+
+        # get next even value of Fibonacci  
+        # sequence 
+        ef3 = 4 * ef2 + ef1 
+
+        # If we go beyond limit, we break loop 
+        if (ef3 > limit) : 
+            break
+
+        # Move to next even number and update 
+        # sum 
+        ef1 = ef2 
+        ef2 = ef3 
+        sm = sm + ef2 
+
+    return sm 
+
+# Driver code 
+limit = 400
+print(evenFibSum(limit))