Add Python solution to challenge 059

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diff --git a/challenge-059/paulo-custodio/python/ch-2.py b/challenge-059/paulo-custodio/python/ch-2.py
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+#!/usr/bin/env python3
+
+# Challenge 059
+#
+# TASK #2 > Bit Sum
+# Reviewed by Ryan Thompson
+# Helper Function
+# For this task, you will most likely need a function f(a,b) which returns the
+# count of different bits of binary representation of a and b.
+#
+# For example, f(1,3) = 1, since:
+#
+# Binary representation of 1 = 01
+#
+# Binary representation of 3 = 11
+#
+# There is only 1 different bit. Therefore the subroutine should return 1. Note
+# that if one number is longer than the other in binary, the most significant
+# bits of the smaller number are padded (i.e., they are assumed to be zeroes).
+#
+# Script Output
+# You script should accept n positive numbers. Your script should sum the result
+# of f(a,b) for every pair of numbers given:
+#
+# For example, given 2, 3, 4, the output would be 6,
+# since f(2,3) + f(2,4) + f(3,4) = 1 + 2 + 3 = 6
+
+import sys
+from itertools import combinations
+
+def f(a, b):
+    r = int(a) ^ int(b)
+    rt = bin(r)
+    return rt.count('1')
+
+n = list(map(int, sys.argv[1:]))
+sum_ = 0
+
+for combin in combinations(n, 2):
+    sum_ += f(combin[0], combin[1])
+
+print(sum_)