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CSCA08H3 Lecture Notes - Lecture 13: Keystream, Racter

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8 Apr 2018

School

Department

Computer Science

Course

Professor

Brian Harrington

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Document Summary

Import unittest import a2 as my_func class test_clean_message(unittest. testcase): def test_all_lowecase(self): result = my_func. clean_message("hello") expected_result = "hello" self. assertequal(result, expected_result, "convert upper to lowercase") def test_number_in_message(self): result = my_func. clean_message("12wor45ld") expected_result = "world" self. assertequal(result, expected_result, "remove numbers from the message") def test_all_number(self): result = my_func. clean_message("123456") expected_result = "" self. assertequal(result, expected_result, "blank string because only numbers") class test_encrypt_letter(unittest. testcase): def test_high_keystream_value(self): result = my_func. encrypt_letter("e", 29) expected_result = "h" self. assertequal(result, expected_result, + "racter") def test_negative_keystream_value(self): result = my_func. encrypt_letter("e", -4) expected_result = "a" self. assertequal(result, expected_result, "should work with negative keystream values") class test_decrypt_letter(unittest. testcase): def test_high_keystream_value(self): result = my_func. decrypt_letter("l", 35) expected_result = "c" self. assertequal(result, expected_result, "keystream value higher than number of alphabetic cha" + "racter") def test_negative_keystream_value(self): result = my_func. decrypt_letter("g", -4) expected_result = "k" self. assertequal(result, expected_result,

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Related Questions

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.

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