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1 Apr 2018

Part (b) [1 MARK] Instead of representing the mapping as a list of str, representing it as which of the following types would make implementing this function easier? (circle one) (a) list of list of str (b) dict of {int: str} (c) dict of str: int}

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Irving Heathcote
Irving HeathcoteLv2
3 Apr 2018
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Question 7. [11 MARKS] This question has you write the bodies of two functions. Complete each function according to its docstring. Part (a) [6 MARKS] Note: you will most likely not need all of the space on this page. def count_letter_case (L): "" (list of list of str) -> list of tuple of int Precondition: each str in L is non-empty and contains only alphabetic characters Count the number of words in each sublist of L that start with lowercase and uppercase letters. Return a new list where each element is a two-item tuple in which the first item is the number of words in the list at the corresponding index of L that start with a lowercase letter and the second item is the number of words in the list at the corresponding index of L that start with an uppercase letter. >>> count_letter_case([['apple', 'Banana'], ['PEAR'], [], ['PEACH', 'apRICot', 'plum']]) [(1, 1), (0, 1), (0, 0), (2, 1)]

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

6. Which answers apply to this program? Mark ALL that apply. int counter = 0; void draw() { background (255); int xpos = width - (2* counter) fwidth; fill (255,0,0); ellipse (xpos, 25, 5, 5); fill(0,255, 0); ellipse (counterswidth, 75, 5, 5); counter = counter + 1; A. The red circle is moving faster than the green circle. B. Most of the time the red one is moving right to left and the green one left to right. C. Most of the time both are moving from left to right. D. Most of the time both are moving from right to left. E. None of the above apply.

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