sAnswer = ##( a word imported from a dictionary text file)
sLetterGuessed = " "
sLetterUsed = " "

sReveal = len(sAnswer) * "_ "

while True:
    sLetterGuessed = raw_input("Enter a letter or guess the word: ").lower()

    while True:
        if sLetterGuessed in sLettersUsed:
            sLettersUsed += sLetterGuessed
            print "can't use that"
            break
        elif sLetterGuessed in sAnswer:
            sReveal = " ".join([x if x== sLetterGuessed else "_" for x in sAnswer ])
            sLettersUsed += sLetterGuessed
            print (sReveal)
            print HangingMan[iErrors]
            break
        elif sLetterGuessed not in sAnswer:
            sReveal = " ".join([x if x== sLetterGuessed else "_" for x in sAnswer ])
            sLettersUsed += sLetterGuessed

            break

## Hangman game
## A random word for example "pizza" will become "_ _ _ _ _ " Player will guess "z" output will be "_ _ z z _ " The current code does show this, but as it's in a loop it will always reset back to blank underscores. If I guess again, "a" it should be "_ _ z z a " but that's not what's happening it becomes "_ _ _ _ a " instead. Please help me with this ordeal !

sAnswer = ##( a word imported from a dictionary text file)
sLetterGuessed = " "
# string containing all of the letters guessed
sLetterUsed = " "
# string containing all of the letters guessed correctly

sReveal = len(sAnswer) * "_ "
# ln(sAnswer) will return a number, multiply that number by "_ "
# ex. 5 * "_ " -> "_ _ _ _ _ "

while True:
    sLetterGuessed = raw_input("Enter a letter or guess the word: ").lower()
    # initialize the letter the user is guessing and convert it to lower case
    # raw input will get the user's input

    while True:
        if sLetterGuessed in sLettersUsed:
           # is the letter guessed a letter they have already guessed?
           # the code checks to see if sLetterGuessed is in the string sLettersUsed
            sLettersUsed += sLetterGuessed
           # add that later to the letters they have guessed
           # i.e. if the user guessed "s" and the letters they have guessed were "abc" the
           # new sLettersUsed will be "abcs"
            print "can't use that"

        elif sLetterGuessed in sAnswer:
           # is the letter the user guessed in the answer word
           # i.e. is "o" in "word"
            sReveal = " ".join([x if x== sLetterGuessed else "_" for x in sAnswer ])
           # join (from the docs) returns a string that is a concatenation of the strings
           # in the iterable.
           # Essentially what this line is doing is replacing the "_" with the correct
           # letter where the correct letter is position. I'm assuming you have played
           # hangman before.
            sLettersUsed += sLetterGuessed
            print (sReveal)
            print HangingMan[iErrors]
           # not sure where HangingMan comes from. the purpose is to print the number of errors."

        elif sLetterGuessed not in sAnswer:
           # if the user makes an incorrect guess.
            sReveal = " ".join([x if x== sLetterGuessed else "_" for x in sAnswer ])
          # same reveal function as above.
            sLettersUsed += sLetterGuessed