--- a/tdd/gcd.py	Fri Sep 03 11:49:18 2010 +0530
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,18 +0,0 @@
-def gcd(a, b):
-    while b != 0:
-        a, b = b, a % b
-    return a
-
-if __name__ == '__main__':
-    for line in open('gcd_testcases.dat'):
-        values = line.split(', ')
-        a = int(values[0])
-        b = int(values[1])
-        g = int(values[2])
-
-        tc = gcd(a, b)
-        if tc != g:
-            print "Test failed for the case a=%d and b=%d. Expected %d. Obtained %d instead." % (a, b, g, tc)
-            exit(1)
-
-    print "All tests passed!"

--- a/tdd/gcd_testcases.dat	Fri Sep 03 11:49:18 2010 +0530
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,50 +0,0 @@
-6, 22, 2
-6, 48744, 6
-14, 143295, 1
-22, 751, 1
-35, 79, 1
-35, 96, 1
-52, 12, 4
-73, 79, 1
-73, 184790, 1
-86, 11, 1
-93, 8, 1
-93, 798, 3
-113, 42785, 1
-209, 2135, 1
-395, 8989, 1
-587, 331, 1
-643, 751, 1
-721, 242525, 1
-733, 5622, 1
-854, 42785, 1
-1695, 57, 3
-1695, 798, 3
-3429, 177203, 1
-4603, 12, 1
-4603, 48744, 1
-6139, 57, 1
-6139, 204, 1
-6660, 96, 12
-6660, 410400, 180
-6703, 410400, 1
-8964, 22, 2
-9673, 751, 1
-9673, 7909, 1
-9673, 3335, 1
-16028, 891, 1
-44231, 378, 1
-49020, 751, 1
-57908, 184790, 2
-65482, 548045, 1
-79715, 8, 1
-79715, 891, 1
-79715, 66371, 1
-321807, 891, 3
-366607, 97, 1
-402212, 5595, 1
-448426, 66371, 1
-575271, 4617, 9
-575271, 402152, 1
-680256, 48744, 72
-779565, 184790, 5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tdd/math_utils/gcd.py	Fri Sep 03 11:51:18 2010 +0530
@@ -0,0 +1,22 @@
+def gcd(a, b):
+    """Returns the Greatest Common Divisor of the two integers
+    passed as arguments.
+
+    Args:
+      a: an integer
+      b: another integer
+
+    Returns: Greatest Common Divisor of a and b
+
+    >>> gcd(48, 64)
+    16
+    >>> gcd(44, 19)
+    1
+    """
+    if b == 0:
+        return b
+    return gcd(b, a%b)
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tdd/math_utils/gcd_testcases.dat	Fri Sep 03 11:51:18 2010 +0530
@@ -0,0 +1,50 @@
+6, 22, 2
+6, 48744, 6
+14, 143295, 1
+22, 751, 1
+35, 79, 1
+35, 96, 1
+52, 12, 4
+73, 79, 1
+73, 184790, 1
+86, 11, 1
+93, 8, 1
+93, 798, 3
+113, 42785, 1
+209, 2135, 1
+395, 8989, 1
+587, 331, 1
+643, 751, 1
+721, 242525, 1
+733, 5622, 1
+854, 42785, 1
+1695, 57, 3
+1695, 798, 3
+3429, 177203, 1
+4603, 12, 1
+4603, 48744, 1
+6139, 57, 1
+6139, 204, 1
+6660, 96, 12
+6660, 410400, 180
+6703, 410400, 1
+8964, 22, 2
+9673, 751, 1
+9673, 7909, 1
+9673, 3335, 1
+16028, 891, 1
+44231, 378, 1
+49020, 751, 1
+57908, 184790, 2
+65482, 548045, 1
+79715, 8, 1
+79715, 891, 1
+79715, 66371, 1
+321807, 891, 3
+366607, 97, 1
+402212, 5595, 1
+448426, 66371, 1
+575271, 4617, 9
+575271, 402152, 1
+680256, 48744, 72
+779565, 184790, 5