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1 CSC 108H5 F 2018 Midterm Test Duration 90 minutes Aids allowed: none Student Number: utorid: Last Name: First Name: Do not turn this page until you have received the signal to start. (Please fill out the identification section above and read the instructions below.) Good Luck! This midterm consists of 5 questions on 9 pages (including this one). When you receive the signal to start, please make sure that your copy is complete. Comments are not required except where indicated, although they may help us mark your answers. You may assume all relevant import statements have been performed. No error checking is required: assume all user input and all argument values are valid. If you use any space for rough work, indicate clearly what you want marked. You may use a pencil; however, work written in pencil may not be considered for remarking. # 1: /13 # 2: / 7 # 3: / 4 # 4: / 6 # 5: /10 TOTAL: /40 Total Pages = 9
2 Question 1. [13 marks] Assume each of the pieces of code below is being entered into the Python console. In each space, write what would be displayed on the console, if anything. If an error would be displayed to the console, write ERROR. Each subquestion is independent of the others. Part (a) [1 mark] >>> x = 5 >>> y = x >>> x = 2 >>> y Part (b) [2 marks] >>> x = 4 >>> y = 2 >>> z = x/y >>> y = x+y * z >>> x = 5 * z // 3 >>> y >>> x Page 2 of 9
3 Part (c) [3 marks] Assume the following two functions have been declared. def f1(x, y): x = y + 2 z = y * x return 2 * f2(x, z) def f2(y, x): x = x - y z = x - y return x - (y + z) >>> z = 1 >>> x = 2 >>> f1(z, x) Part (d) [2 marks] >>> s = "EZ Marks." >>> t = s[1:4] >>> t >>> t[2] Page 3 of 9
4 Part (e) [2 marks] >>> L = [5, 8, 3, 0, 1, 2, 6, 24] >>> for z in L: if z%3!= 0 and z%2 == 0: print(z) Part (f) [3 marks] >>> L = [[5, 9, 1, 1, 2], [7, 7], [], [1]] >>> for i in range(len(l[0])): s = 0 for n in L[i]: s += n print(s) Page 4 of 9
5 Question 2. [7 marks] Recall the is a number function from Assignment 1. The function takes in a string and returns True if and only if that string represents a positive number or positive decimal number (see some examples in the docstring below). Implement is a number without the use of loops, or try/exceptions. If your code uses either of these constructs, you will receive 0. Focus on passing the examples in the docstring. Do NOT worry about cases like 1.0, 4.0e7, etc. def is_a_number(s:str)-> bool: """ Returns True if and only if s is a string representing a positive number. Examples: >>> is_a_number("1") True >>> is_a_number("one") False >>> is_a_number("-3") False >>> is_a_number("3.") True >>> is_a_number("14.61") True >>> is_a_number("3.1.2") False """ Page 5 of 9
6 Question 3. [4 marks] Consider the function below. Reimplement (rewrite) it using only a single if statement. To get full grades there should not be any else or elif clauses, only a single if clause. The behaviour of your new function should be equivalent to the original function in the sense that given the same input, the two functions (original and new) will produce the same output. def my_fun(n: int, m: int)-> int: if n > 5 and m > 0: if n > 0: return 1 else: return 2 elif m <= 0 or n < 6: return 3 else: return 4 Page 6 of 9
7 Question 4. [6 marks] Consider the function below. Reimplement (rewrite) it using a while loop instead of a for loop. The behaviour of your new function should be equivalent to the original function in the sense that given the same input, the two functions (original and new) will produce the same output. def my_fun(s: str)-> int: n = 0 for char in s: if not char in "aeiouaeiou": n += 1 return n Page 7 of 9
8 Question 5. [10 marks] Implement the function below. def positive_average(l: List[List[int]])-> float: """ Takes in a nested list of integers L, and returns the average value of all positive numbers. If there are no positive numbers, it returns 0.0. The function does not consider 0 to be a positive number. Examples: >>> L = [[1, -2, 0], [9, -2], []] >>> positive_average(l) 5.0 >>> L = [[5, 9, 0, 1, 4, -9]] >>> positive_average(l) 4.75 >>> L = [[-6, -10, 0], [-65], [-10102, -4], [-8]] 0.0 """ Page 8 of 9
9 Short Python function/method descriptions: builtins : int(x) -> int Convert x to an integer, if possible. A floating point argument will be truncated towards zero. len(x) -> int Return the length of list, tuple, or string x. print(value) -> NoneType Prints the values. range([start], stop, [step]) -> list-like-object of int Return the integers starting with start and ending with stop - 1 with step specifying the amount to increment (or decrement). If start is not specified, the sequence starts at 0. If step is not specified, the values are incremented by 1. str(x) -> str Return an object converted to its string representation, if possible. str: x in s -> bool Return True if and only if x is in s. S.count(sub[, start[, end]]) -> int Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation. S.find(sub[,i]) -> int Return the lowest index in S (starting at S[i], if i is given) where the string sub is found or -1 if sub does not occur in S. S.isalpha() -> bool Return True if and only if all characters in S are alphabetic and there is at least one character in S. S.isdigit() -> bool Return True if and only if all characters in S are digits and there is at least one character in S. S.isnumeric() -> bool Returns True if all characters in a string are numeric characters. If not, it returns False. S.lower() -> str Return a copy of S converted to lowercase. S.replace(old, new) -> str Return a copy of S with all occurrences of the string old replaced with the string new. S.split([sep]) -> list of str Return a list of the words in S; use string sep as the separator and any whitespace string if sep is not specified. S.upper() -> str Return a copy of S converted to uppercase. S.startswith(sub) -> bool Return True if and only if S starts with the substring sub. list: x in L --> bool Return True if and only if x is in L L.append(object) -> NoneType Append object to end of L. L.pop(int) -> item Remove and return item at index (default last). Raises IndexError if list is empty or index is out of range. Total Pages = 9 End of Test
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