Moved 6 to 11 from ipython to python.

python/e006.py

@@ -1,5 +1,14 @@
-def euler_006():
-    return 0
 
-assert(euler_006() == 233168)
+def diff_between_sum_of_squares_and_square_sum(n):
+    a = sum([x for x in range(1, n + 1)])**2
+    b = sum([x**2 for x in range(1, n + 1)])
+    return a - b
+
+
+def euler_006():
+    return diff_between_sum_of_squares_and_square_sum(100)
+
+
+assert(diff_between_sum_of_squares_and_square_sum(10) == 2640)
+assert(euler_006() == 25164150)
 print("e006.py: {}".format(euler_006()))