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edX MIT 6.00.1x 2020 Introduction to Computer Science and Programming Using Python

Week 4: Good Programming Practices: Problem Set 4 Problem 1 Solution

Word Game - Wordgame.py

Problem 1 - Word Scores / Scoring a word

The first step is to implement some code that allows us to calculate the score for a single word. The function getWordScore should accept as input a string of lowercase letters (a word) and return the integer score for that word, using the game's scoring rules.

Scoring - A Reminder of the Scoring Rules

The score for the hand is the sum of the scores for each word formed.

The score for a word is the sum of the points for letters in the word, multiplied by the length of the word, plus 50 points if all n letters are used on the first word created.

Letters are scored as in Scrabble; A is worth 1, B is worth 3, C is worth 3, D is worth 2, E is worth 1, and so on. We have defined the dictionary SCRABBLE_LETTER_VALUES that maps each lowercase letter to its Scrabble letter value.

For example, 'weed' would be worth 32 points ((4+1+1+2) for the four letters, then multiply by len('weed') to get (4+1+1+2)*4 = 32). Be sure to check that the hand actually has 1 'w', 2 'e's, and 1 'd' before scoring the word!

As another example, if n=7 and you make the word 'waybill' on the first try, it would be worth 155 points (the base score for 'waybill' is (4+1+4+3+1+1+1)*7=105, plus an additional 50 point bonus for using all n letters).

Hints

You may assume that the input word is always either a string of lowercase letters, or the empty string "".
You will want to use the SCRABBLE_LETTER_VALUES dictionary defined at the top of ps4a.py. You should not change its value.

Do not assume that there are always 7 letters in a hand! The parameter n is the number of letters required for a bonus score (the maximum number of letters in the hand). Our goal is to keep the code modular - if you want to try playing your word game with n=10 or n=4, you will be able to do it by simply changing the value of HAND_SIZE!

Testing: If this function is implemented properly, and you run test_ps4a.py, you should see that the test_getWordScore() tests pass. Also test your implementation of getWordScore, using some reasonable English words.

Fill in the code for getWordScore in ps4a.py and be sure you've passed the appropriate tests in test_ps4a.py before pasting your function definition.

Step by step process. Practice by writing the code yourself.

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