Moved 1 to 5 to Python and learned a ton.

python/e002.py

@@ -0,0 +1,24 @@
+from lib_fibonacci import fibonacci_generator_smaller
+
+
+def euler_002():
+    fs = [f for f in fibonacci_generator_smaller(4000000) if f % 2 == 0]
+    return sum(fs)
+
+
+assert(euler_002() == 4613732)
+print("e002.py: {}".format(euler_002()))
+
+
+def euler_002_simple():
+    """ Sometimes it is nice to keep it simple. Instead of using three
+    library functions just implement one straightforward function. """
+    r, a, b = 0, 0, 1
+    while b < 4000000:
+        if b % 2 == 0:
+            r += b
+        a, b = b, a + b
+    return r
+
+
+assert(euler_002() == euler_002_simple())