def displayHand(hand):

def displayHand(hand):
    """
    Displays the letters currently in the hand.

    For example:
    >>> displayHand({'a':1, 'x':2, 'l':3, 'e':1})
    Should print out something like:
       a x x l l l e
    The order of the letters is unimportant.

    hand: dictionary (string -> int)
    """

    for letter in hand.keys():
        for j in range(hand[letter]):
             print letter,              # print all on the same line
    print                               # print an empty line
    return ""

def playHand(hand, wordList, n):

def playHand(hand, wordList, n):
    """
    Allows the user to play the given hand, as follows:

    * The hand is displayed.
    * The user may input a word or a single period (the string ".") 
      to indicate they're done playing
    * Invalid words are rejected, and a message is displayed asking
      the user to choose another word until they enter a valid word or "."
    * When a valid word is entered, it uses up letters from the hand.
    * After every valid word: the score for that word is displayed,
      the remaining letters in the hand are displayed, and the user
      is asked to input another word.
    * The sum of the word scores is displayed when the hand finishes.
    * The hand finishes when there are no more unused letters or the user
      inputs a "."

      hand: dictionary (string -> int)
      wordList: list of lowercase strings
      n: integer (HAND_SIZE; i.e., hand size required for additional points)
      
    """
    # BEGIN PSEUDOCODE (download ps4a.py to see)

    number_letters_left_in_hand = n
    total_score = 0
    # As long as there are still letters left in the hand:
    while(number_letters_left_in_hand > 0):
        # Display the hand
        print "Current Hand:", displayHand(hand)
        # Ask user for input
        word = raw_input('Enter word, or a "." to indicate that you are finished: ')
        # If the input is a single period:
        if(word == "."):
            # End the game (break out of the loop)
            print("Goodbye! Total score: " + str(total_score) + " points.")
            return
        # Otherwise (the input is not a single period):
        else:
            # If the word is not valid:
            if(not isValidWord(word, hand, wordList)):
                # Reject invalid word (print a message followed by a blank line)
                print("Invalid word, please try again.")
                print("")
            # Otherwise (the word is valid):
            else:
                # Tell the user how many points the word earned, and the updated total score, in one line followed by a blank line
                total_score = total_score + getWordScore(word, n)
                print("\"" + word + "\"" + " earned " + str(total_score) + " points. Total: " + str(total_score) + " points")
                print("")
                # Update the hand 
                hand = updateHand(hand, word)
                number_letters_left_in_hand = calculateHandlen(hand)
    # Game is over (user entered a '.' or ran out of letters), so tell user the total score
    print("Run out of letters. Total score: " + str(total_score) + " points.")

Test 5: Full hand transcript - using all letters

Function call: playHand({'a': 2, 'p': 1, 'r': 1, 'e': 2, 't': 1}, '<edX internal wordList>', 7)
Test 5: Full hand transcript - using all letters
Your output:
Current Hand: a a p r e e t
None
Enter word, or a "." to indicate that you are finished: pear
"pear" earned 24 points. Total: 24 points

Current Hand: a e t
None
Enter word, or a "." to indicate that you are finished: tea
"tea" earned 33 points. Total: 33 points

Run out of letters. Total score: 33 points.
None
Correct output:
Current Hand: a a p r e e t
Enter word, or a "." to indicate that you are finished: pear
"pear" earned 24 points. Total: 24 points

Current Hand: a e t
Enter word, or a "." to indicate that you are finished: tea
"tea" earned 9 points. Total: 33 points

Run out of letters. Total score: 33 points.
None

Test 6: Full hand transcript - can't use every letter

Function call: playHand({'a': 2, 'p': 2, 'r': 1, 'z': 1, 'e': 1}, '<edX internal wordList>', 7)
Test 6: Full hand transcript - can't use every letter
Your output:
Current Hand: a a p p r z e
None
Enter word, or a "." to indicate that you are finished: pear
"pear" earned 24 points. Total: 24 points

Current Hand: a p z
None
Enter word, or a "." to indicate that you are finished: za
"za" earned 46 points. Total: 46 points

Current Hand: p
None
Enter word, or a "." to indicate that you are finished: p
Invalid word, please try again.

Current Hand: p
None
Enter word, or a "." to indicate that you are finished: .
Goodbye! Total score: 46 points.
None
Correct output:
Current Hand: a a p p r z e
Enter word, or a "." to indicate that you are finished: pear
"pear" earned 24 points. Total: 24 points

Current Hand: a p z
Enter word, or a "." to indicate that you are finished: za
"za" earned 22 points. Total: 46 points

Current Hand: p
Enter word, or a "." to indicate that you are finished: p
Invalid word, please try again.

Current Hand: p
Enter word, or a "." to indicate that you are finished: .
Goodbye! Total score: 46 points.
None