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Computer Science
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write an expression that evaluates to true if the str associated with s starts with "p".

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Jean Keeling
Jean KeelingLv2
11 Mar 2020
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Question 5. [7 MARKS] Part (a) (6 MARKS) Write the body of the following function according to its docstring description. def numeric-phone (alphanumeric_phone, mapping): (str, list of str) -> int Preconditions: - len(mapping) <= 10 - alphanumeric-phone contains only digits and uppercase letters - each letter in alphanumeric_phone is guaranteed to appear in mapping once - mapping may contain letters not in alphanumeric-phone Return a numeric phone number that corresponds to alphanumeric_phone. Each letter from alphanumeric-phone is replaced with the index of the item from mapping that contains the letter. Digits are not replaced. >>> numeric-phone ('416310BELL', ['ABC', 'DEF', 'GHI', 'JKL', 'NO', 'PQRS', 'TUV', 'WXYZ']) 4163100133

Question 4. [4 MARKS] You decide to save all your passwords in files, one password per file. You then decide you want to update your 6-character UTORid password, but you don't remember which of your password files you saved it in. Luckily, this is the only 6-character password you have so you decide to write a function to find the password and change it. Your code runs, but the function's body contains four bugs which will result in the function execution not matching its docstring description. In the space provided, rewrite the buggy lines with the bugs fixed. Do not add or remove any lines. def change password(files_list, new-password): " (list of str, str) -> str Preconditions: (1) files list is not empty. (2) Each file in files_list contains one single-line password. (3) All files in files_list contain passwords of different lengths. (4) Your 6-character password is guaranteed to be in one of these files. In the appropriate file from files_list, replace your 6-character password with new-password, and return your old password. #Code If you think a given line contains a bug, rewrite it. Otherwise leave it blank. found = True for filename in files list[:-1]: passwd_file = open(filename, 'r') first line = passwd_file.read() password = first line.strip("2") if password == 6: passwd_file.close() passwd_file = open(filename, 'w') passwd_file.write(new_password) found = True passwd_file.close() if found: # This is correct. Do not modify. return password

Question 8. [6 MARKS] Consider this code: def sort_guesses (guess_list, answer): (list of float, float) -> dict of (str: list of float) Return a new dictionary where each item in guess_list appears as an item in one of the dictionary's values lists: - each item less than answer is in a list associated with key 'low', - each item equal to answer is in a list associated with key 'correct', and - each item greater than answer is in a list associated with key 'high'. If there are no items associated with one of 'low', 'correct', or 'high', then that string should not appear as a key in the new dictionary. In the table below, we have outlined two test cases for sort_guesses. Add six more test cases chosen to test the function thoroughly. R eturn Value Test Case Description no guesses one low guess guess_list answer [ 5.5 [4.7] 6.0 {'low': [4.7]}

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