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+#!/usr/bin/env python3
+#
+# Morse.py - A morse code interpreter.
+#
+# A friend of mine likes to send me messages in Morse code
+# sometimes. He's a little weird. He thinks I'm really good at Morse
+# code. Actually, I can just do some Python.
+#
+# Author: Ben Sima <bensima@gmail.com>
+# Date: 2015-07-06
+# License: MIT
+#
+
+
+import re
+import argparse
+from typing import Dict
+
+
+eng = {
+    "a" : ".-",
+    "b" : "-...",
+    "c" : "-.-.",
+    "d" : "-..",
+    "e" : ".",
+    "f" : "..-.",
+    "g" : "--.",
+    "h" : "....",
+    "i" : "..",
+    "j" : ".---",
+    "k" : "-.-",
+    "l" : ".-..",
+    "m" : "--",
+    "n" : "-.",
+    "o" : "---",
+    "p" : ".--.",
+    "q" : "--.-",
+    "r" : ".-.",
+    "s" : "...",
+    "t" : "-",
+    "u" : "..-",
+    "v" : "...-",
+    "w" : ".--",
+    "x" : "-..-",
+    "y" : "-.--",
+    "z" : "--..",
+    " " : "/",
+    "0" : "-----",
+    "1" : ".----",
+    "2" : "..---",
+    "3" : "...--",
+    "4" : "....-",
+    "5" : ".....",
+    "6" : "-....",
+    "7" : "--...",
+    "8" : "---..",
+    "9" : "----.",
+    "," : ",",
+    "!" : "!",
+    "?" : "?",
+} # type: Dict[str, str]
+
+
+morse = {v: k for k, v in eng.items()} # type: Dict[str, str]
+
+
+class InvalidMorseLetter(Exception):
+    "Handle errors when processing Morse Code."
+    pass
+
+
+class InvalidEnglishLetter(Exception):
+    "Handle errors when processing English."
+    pass
+
+
+def morsep(msg: str) -> bool:
+    "Predicate for detecting Morse Code."
+    return msg[0][0] in ['.', '-', '/']
+
+
+def morse_to_eng(msg: str) -> str:
+    """Translate Morse code to English.
+
+    Will raise an InvalidMorseLetter if an error during
+    the translation occurs."""
+    split_msg = re.split(" ", msg) # type: list
+    filtered_msg = [e for e in split_msg if e] # type: list
+    try:
+        return ''.join("{}".format(morse[char]) for char in filtered_msg)
+    except KeyError:
+        raise InvalidMorseLetter
+
+def eng_to_morse(msg: str) -> str:
+    """Translate English into Morse Code.
+
+    Will rais an InvalidEnglishLetter if an error during
+    the translation occurs."""
+    try:
+        return ''.join("{} ".format(eng[char]) for char in msg)
+    except KeyError:
+        raise InvalidEnglishLetter
+
+
+def decode(msg: str) -> str:
+    "Main control flow."
+    lower_msg = msg.lower()
+    if morsep(lower_msg) == True:
+        return morse_to_eng(lower_msg)
+    else:
+        return eng_to_morse(lower_msg)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Translate English to Morse code, and vice versa.')
+    parser.add_argument('-v', '--version', help='Show the version.', action='version',
+            version='Morse 0.1')
+    parser.add_argument('msg', type=str, nargs=1,
+                        help="""The message to be decoded.
+                        Input type will be automatically detected and converted.
+                        Must be wrapped in quotes.""")
+
+    args = parser.parse_args()
+    out = decode(args.msg[0]) # type: str
+    print("{}".format(out))
+