CSC108H1 Lecture 6: CSC108-Winter-2016-Lecture-6

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pearcattle325

10 Apr 2016

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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)]

Part (b) [3 MARKS] Complete the function body according to its docstring description. You will be marked only on the parts that need to be different from (a). def count_letter_case_mutate (L): " (list of list of str) -> None Type Precondition: each str in L is non-empty and contains only alphabetic characters Replace each item in L with 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 >>> data = [['apple', 'Banana'], ['PeAr'], [], ['PEACH', 'aprICot', 'plum']] >>> count_letter_case_mutate (data) >>> data [(1, 1), (0, 1), (0, 0), (2, 1)]

1.Create a list that contains 10 successive integers starting with the value in the variable start. For example, if start is 7, the resulting list should be [7, 8, 9, 10, 11, 12, 13, 14, 15, 16]. Store the list in a variable named my_list. Assume that the value of start has already been set.

2.Create a list that is made up of the first half of the elements of a list called original_list. Store the new list in a variable called half_list. Assume that the original list has already been initialized and contains an even number of elements.

3. Write a predicate function called same_ends that accepts a list of integers and an integer (n) as arguments. Return True if the first n numbers in the list are the same as the last n numbers in the list, and False otherwise. For example, if the list was [1, 2, 3, 4, 99, 1, 2, 3, 4], the function would return True if n is 4 and False if n is 3. Assume that n is between 1 and the length of the list, inclusive.

4.Write a function called highest_values that accepts as arguments a list of numeric values and a single integer (n). The function should return a list made up of the largest n values from the argument list in order from lowest to highest. For example, if the argument list is [46, 82, 25, 61, 70, 33, 54] and n is 3, the return value should be [61, 70, 82]. Assume that the argument list contains at least n elements.

5.Assume that a list of integers stored in a variable named original contains exactly two elements that are zero. Write code that creates a separate list that contains the elements from original that are between the two zeros. Do not include the zeros in the new list. Store the list in a variable named between_zeros.

6. Write a function called price_range that accepts a list of floating-point numbers representing prices as an argument and returns the the difference between the highest price and the lowest price. Do NOT use the built-in functions max or min in your solution. Assume that all prices are positive values and that none of them exceed 10,000.00.

7. Write a function called count_vowels that accepts a string argument that represents a word and returns the number of vowels that are in the word. The vowels are A, E, I, O, and U (ignore the 'sometimes Y' rule). Count both uppercase and lowercase vowels.

Assume that the variable table holds a two-dimensional list of integers. Write code that computes the sum of all elements in the table, assigning the result to the variable table_sum.