Syntax error Morse Code Translator in Python

Morse Code Translator in Python

Morse Code Translator is used in Cryptography. It is named by Samuel F. B. Morse. By this technique we convert a message to a series of dots, commas,"-","/".

This technique is very simple. Every alphabet in English signifies a series of ".",",","/","-". We just encrypt the message from message to symbols and decrypt from symbols to English.

The dictionary is given below

'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':'--..',
'1':'.----', '2':'..---', '3':'...--',
'4':'....-', '5':'.....', '6':'-....',
'7':'--...', '8':'---..', '9':'----.',
'0':'-----', ', ':'--..--', '.':'.-.-.-',
'?':'..--..', '/':'-..-.', '-':'-....-',
'(':'-.--.', ')':'-.--.-'}

Example

Message is PYTHON-PROGRAM
Output is .--. -.-- - .... --- -.  -....- .--. .-. --- --. .-. .- --

Algorithm

Encryption

Step1: Given a string, atfirst we extract each letter from the word and match with the Morse Code dictionary, then we consider the code corresponding the letter.
Step2: Next step is to store the code into a variable. And we have to follow that one space should be maintained between every Morse code.
Step3: Two spaces should be maintained in between every word.

Decryption

Step1: First we add a space at the end of the string.
Step2: Now we traverse each letter of the message until space is not encountered.
Step3: When we get space then check with Morse Code Dictionary and store in a variable.
Step4: When get 2 consecutive spaces we will add another space to our variable containing the decoded string.
Step5: When get last space of the message that means this is the last letter of Morse Code Generator.

Example code

# -*- coding: utf-8 -*-
"""
Created on Tue Oct  2 11:21:31 2018
@author: Satyajit
"""
# Dictionary representing the morse code chart
MORSE_CODE_DICT = { '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':'--..',
   '1':'.----', '2':'..---', '3':'...--',
   '4':'....-', '5':'.....', '6':'-....',
   '7':'--...', '8':'---..', '9':'----.',
   '0':'-----', ', ':'--..--', '.':'.-.-.-',
   '?':'..--..', '/':'-..-.', '-':'-....-',
   '(':'-.--.', ')':'-.--.-'
}
def encryption(message):
   my_cipher = ''
   for myletter in message:
      if myletter != ' ':
         my_cipher += MORSE_CODE_DICT[myletter] + ' '
      else:
         my_cipher += ' '
      return my_cipher
# This function is used to decrypt
# Morse code to English
def decryption(message):
   message += ' '
   decipher = ''
   mycitext = ''
   for myletter in message:
      # checks for space
      if (myletter != ' '):
         i = 0
         mycitext += myletter
      else:
         i += 1
         if i == 2 :
            decipher += ' '
         else:
            decipher += list(MORSE_CODE_DICT.keys())[list(MORSE_CODE_DICT
            .values()).index(mycitext)]
            mycitext = ''
   return decipher
def main():
   my_message = "PYTHON-PROGRAM"
   output = encryption(my_message.upper())
   print (output)
   my_message = ".--. -.-- - .... --- -.  -....- .--. .-. --- --. .-. .- -- "
   output = decryption(my_message)
   print (output)
# Executes the main function
if __name__ == '__main__':
   main()

Output

.--. -.-- - .... --- -.  -....- .--. .-. --- --. .-. .- --
PYTHON-PROGRAM
Updated on: 2019-07-30T22:30:23+05:30

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