python: Add the Python implementation of the phoentic generator

Add the Python implementation of the phoentic table generator.

python/phogen_map/roman.py

@@ -0,0 +1,45 @@
+roman_symbol = [
+        [ "IV", 4   ],
+        [ "IX", 9   ],
+        [ "XL", 40  ],
+        [ "XC", 90  ],
+        [ "CD", 400 ],
+        [ "CM", 900 ],
+        [ "I",  1   ],
+        [ "V",  5   ],
+        [ "X",  10  ],
+        [ "L",  50  ],
+        [ "C",  100 ],
+        [ "D",  500 ],
+        [ "M",  1000]
+]
+
+# Convert an integer to its roman representation as string
+def int_to_roman(i):
+    s = ""
+    for rs in sorted(roman_symbol, key=lambda x: x[1], reverse=True):
+        count = i // rs[1]
+        s += rs[0] * count
+        if count > 0:
+            i %= rs[1] * count
+
+    return s
+
+# Convert a roman number to its integer value; return 0 on error
+def roman_to_int(s):
+    i = 0
+    su = s.upper()
+    while len(su) > 0:
+        for rs in roman_symbol:
+            if su.startswith(rs[0]):
+                break
+        else:
+            return 0
+
+        i += rs[1]
+        su = su.removeprefix(rs[0])
+
+    if s.upper() != int_to_roman(i):
+        return 0
+
+    return i