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POHow to read a string one letter at a time in python
 

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  1. POHow to read a string one letter at a time in python
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    <p>I need to convert a string inputed by a user into morse code. The way our professor wants us to do this is to read from a morseCode.txt file, seperate the letters from the morseCode into two lists, then convert each letter to morse code (inserting a new line when there is a space).</p> <p>I have the beginning. What it does is reads the morseCode.txt file and seperates the letters into a list [A, B, ... Z] and the codes into a list ['– – . . – –\n', '. – . – . –\n'...].</p> <p>We haven't learned "sets" yet, so I can't use that. How would I then take the string that they inputed, go through letter by letter, and convert it to morse code? I'm a bit caught up. Here's what I have right now (not much at all...)</p> <p>EDIT: completed the program!</p> <pre><code># open morseCode.txt file to read morseCodeFile = open('morseCode.txt', 'r') # format is &lt;letter&gt;:&lt;morse code translation&gt;&lt;\n&gt; # create an empty list for letters letterList = [] # create an empty list for morse codes codeList = [] # read the first line of the morseCode.txt line = morseCodeFile.readline() # while the line is not empty while line != '': # strip the \n from the end of each line line = line.rstrip() # append the first character of the line to the letterList letterList.append(line[0]) # append the 3rd to last character of the line to the codeList codeList.append(line[2:]) # read the next line line = morseCodeFile.readline() # close the file morseCodeFile.close() try: # get user input print("Enter a string to convert to morse code or press &lt;enter&gt; to quit") userInput = input("") # while the user inputs something, continue while userInput: # strip the spaces from their input userInput = userInput.replace(' ', '') # convert to uppercase userInput = userInput.upper() # set string accumulator accumulateLetters = '' # go through each letter of the word for x in userInput: # get the index of the letterList using x index = letterList.index(x) # get the morse code value from the codeList using the index found above value = codeList[index] # accumulate the letter found above accumulateLetters += value # print the letters print(accumulateLetters) # input to try again or &lt;enter&gt; to quit print("Try again or press &lt;enter&gt; to quit") userInput = input("") except ValueError: print("Error in input. Only alphanumeric characters, a comma, and period allowed") main() </code></pre>
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    1. COI know your teachers would be encouraging you to comment the code, but you should learn too to use them only if they add something useful ;-) (e.g. document API's, reference where your formulae or data tables were taken from, explain why doing something in some way when there seems to be another simpler, etc.)
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    2. COconsider putting the try/except stuff inside the `for x in inputLetters` loop. That way you can "accept" out-of-range characters but then carry on converting all of the rest. Also, you wouldn't need to remove all of the spaces up front.
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      1. USdash-tom-bang
    3. COthanks for the comments guys. dash-tom-bang, i edited the program to allow spaces by appending the list to allow it. and thanks fortran, but unfortunately the way the teacher makes us write our programs, she wants us to write it in all pseudo-code first, then go back and fill it in with the actual code. so if something isn't commented, she'll know we didn't do the pseudo-code first. i appreciate all your guys help though!
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