Yusef's implementation

roman.py

@@ -0,0 +1,24 @@
+import sys
+
+A=list('MDCLXVI')
+D=(2,5)
+
+for l in open(sys.argv[1]):
+    n=int(l)
+    s=''
+    t=[]
+    i=0
+    v=1000
+    while n > 0:
+        f, n = (n//v, n%v)
+
+        if f < 4:
+            s += A[i] * f
+        else:
+            y = t[i-1]
+            s = s[:len(s)-y] + A[i] + A[i-1-y]
+
+        v //= D[i%2]
+        t += [f]
+        i+=1
+    print(s)