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Task/Bulls-and-cows/Python/bulls-and-cows.py

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+'''
+ Bulls and cows. A game pre-dating, and similar to, Mastermind.
+'''
+
+import random
+
+digits = '123456789'
+size = 4
+chosen = ''.join(random.sample(digits,size))
+#print chosen # Debug
+print '''I have chosen a number from %s unique digits from 1 to 9 arranged in a random order.
+You need to input a %i digit, unique digit number as a guess at what I have chosen''' % (size, size)
+guesses = 0
+while True:
+    guesses += 1
+    while True:
+        # get a good guess
+        guess = raw_input('\nNext guess [%i]: ' % guesses).strip()
+        if len(guess) == size and \
+           all(char in digits for char in guess) \
+           and len(set(guess)) == size:
+            break
+        print "Problem, try again. You need to enter %i unique digits from 1 to 9" % size
+    if guess == chosen:
+        print '\nCongratulations you guessed correctly in',guesses,'attempts'
+        break
+    bulls = cows = 0
+    for i in range(size):
+        if guess[i] == chosen[i]:
+            bulls += 1
+        elif guess[i] in chosen:
+            cows += 1
+    print '  %i Bulls\n  %i Cows' % (bulls, cows)