Morse code for english python3

Question

I want to convert morse code to english using python 3+ i managed to convert english to morse code using this http://code.activestate.com/recipes/578407-simple-morse-code-translator-in-python/

But I want to convert Morse code to English

I tried to do this one charecter at a time, but the problem is that the Morse code letters are not 1 charecter long, like English letters, so E is "." . and S is "...", the problem is that in the loop of the word there is "." . and match it with E, so instead of getting S, I get "EEE", I tried to fix it by finding spaces and making that word at a time, but instead of looking for letters in the word, it searches for the whole word against the dictionary I'm new to Python and dictionaries, and I don’t know how to distinguish between E "." and S "..." when searching in my dictionary

Here is my code

# defines the dictionary to convert morse to english CODE_reversed = {'..-.': 'F', '-..-': 'X', '.--.': 'P', '-': 'T', '..---': '2', '....-': '4', '-----': '0', '--...': '7', '...-': 'V', '-.-.': 'C', '.': 'E', '.---': 'J', '---': 'O', '-.-': 'K', '----.': '9', '..': 'I', '.-..': 'L', '.....': '5', '...--': '3', '-.--': 'Y', '-....': '6', '.--': 'W', '....': 'H', '-.': 'N', '.-.': 'R', '-...': 'B', '---..': '8', '--..': 'Z', '-..': 'D', '--.-': 'Q', '--.': 'G', '--': 'M', '..-': 'U', '.-': 'A', '...': 'S', '.----': '1'} def main(): #takes user message and makes it upper case msg = input('MESSAGE: ') msg = msg.upper() addtolist = "" # creates blank string message = [] # creates blank list for i in msg: addtolist = addtolist + i # adds every letter in MSG into a string until it finds a space addtolist.upper() # makes every letter uppercase if i == " ": # if it detects a space message.extend(addtolist) # adds the previously created addtolist to a list, this makes one word addtolist = "" # clears previous variable for i in message: # for every word in the list str(i) # make it into a string print(CODE_reversed[i()]) # search the dictionary for that word if __name__ == "__main__": main() 

This code takes the word and tries to find it against the dictionary, but it doesn’t work. I also tried to find every letter of the Morse codes against the dictionary, but the problem is that you cannot say when the letter starts and ends, so “...” appears like "EEE" instead of "S" and I don’t know how to fix it.

I also tried to find solutions, but found them only in Java, and I don't know Java

Answer 1

Once you define a mapping in one direction, you can use the dict comprehension to map it in another way.

 CODE = {'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': '----.' } CODE_REVERSED = {value:key for key,value in CODE.items()} 

You can then use join with a generator expression to perform translations.

 def to_morse(s): return ' '.join(CODE.get(i.upper()) for i in s) def from_morse(s): return ''.join(CODE_REVERSED.get(i) for i in s.split()) >>> to_morse('hello') '.... . .-.. .-.. ---' >>> from_morse('.... . .-.. .-.. ---') 'HELLO'