tasks a-s

Task/Roman-numerals-Decode/Python/roman-numerals-decode-1.py

@@ -0,0 +1,12 @@
+_rdecode = dict(zip('MDCLXVI', (1000, 500, 100, 50, 10, 5, 1)))
+
+def decode( roman ):
+    result = 0
+    for r, r1 in zip(roman, roman[1:]):
+        rd, rd1 = _rdecode[r], _rdecode[r1]
+        result += -rd if rd < rd1 else rd
+    return result + _rdecode[roman[-1]]
+
+if __name__ == '__main__':
+    for r in 'MCMXC MMVIII MDCLXVI'.split():
+        print( r, decode(r) )

Task/Roman-numerals-Decode/Python/roman-numerals-decode-2.py

@@ -0,0 +1,20 @@
+roman_values = (('I',1), ('IV',4), ('V',5), ('IX',9),('X',10),('XL',40),('L',50),('XC',90),('C',100),
+                    ('CD', 400), ('D', 500), ('CM', 900), ('M',1000))
+
+def roman_value(roman):
+    total=0
+    for symbol,value in reversed(roman_values):
+        while roman.startswith(symbol):
+            total += value
+            roman = roman[len(symbol):]
+    return total
+
+if __name__=='__main__':
+    for value in "MCMXC", "MMVIII", "MDCLXVI":
+        print('%s = %i' % (value, roman_value(value)))
+
+""" Output:
+MCMXC = 1990
+MMVIII = 2008
+MDCLXVI = 1666
+"""