Quiz - 10

Develop the function how_many_donuts that takes n, a positive integer, as a parameter, and returns a string in the form of "Number of donuts: n", where n is the value passed to the function as an argument. However, if n >= 10, how_many_donuts will return "many" instead of n.

Examples:
how_many_donuts(5) -> "Number of donuts: 5"
how_many_donuts(23) -> "Number of donuts: many"

def how_many_donuts(n): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(how_many_donuts(4), "Number of donuts: 4", "Expected output: Number of donuts: 4") self.assertEqual(how_many_donuts(9), "Number of donuts: 9", "Expected output: Number of donuts: 9") self.assertEqual( how_many_donuts(10), "Number of donuts: many", "Expected output: Number of donuts: many", ) self.assertEqual( how_many_donuts(99), "Number of donuts: many", "Expected output: Number of donuts: many", ) myTests().main()

Develop the function chain_of_extremes that, given a string s, returns a string with the first two and last two letters of s. However, if the string has less than 2 letters, it returns an empty string.

Examples:
chain_of_extremes("palms") -> "pams"
chain_of_extremes("a") -> ""

def chain_of_extremes(s): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(chain_of_extremes("palms"), "pams", "Expected output: pams") self.assertEqual(chain_of_extremes("algorithms"), "alms", "Expected output: alms") self.assertEqual(chain_of_extremes("co"), "coco", "Expected output: coco") self.assertEqual(chain_of_extremes("a"), "", "Expected output: ''") self.assertEqual(chain_of_extremes("xyz"), "xyyz", "Expected output: xyyz") self.assertEqual(chain_of_extremes(""), "", "Expected output: ''") myTests().main()

Develop the function replace_first_character that, given a string s, returns a string in which all occurrences of the first character in s are replaced by “*”, except for the first one. Note: use the method .replace(value_to_replace, new_value) to solve the exercise.

Examples:
replace_first_character("google") -> "goo*le"
replace_first_character("donut") -> "donut"

def replace_first_character(s): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(replace_first_character("babble"), "ba**le", "Expected output: ba**le") self.assertEqual(replace_first_character("aardvark"), "a*rdv*rk", "Expected output: a*rdv*rk") self.assertEqual(replace_first_character("google"), "goo*le", "Expected output: goo*le") self.assertEqual(replace_first_character("donut"), "donut", "Expected output: donut") myTests().main()

Develop the function combine_two_chains that takes two strings as arguments, a and b, and returns a new string in the following way:

• The new string has to be a combination of a and b.

• The new string will have the form "<a> <b>", note the space between both.

• The new string will interchange the first two letters of a and b.

Suppose that a and b have more than 2 characters. For better clarification, see the following examples.

Examples:
combine_two_chains("mix", "pod") -> "pox mid"
combine_two_chains("pezzy", "firm") -> "fizzy perm"

def combine_two_chains(a, b): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(combine_two_chains("mix", "pod"), "pox mid", "Expected output: pox mid") self.assertEqual(combine_two_chains("dog", "dinner"), "dig donner", "Expected output: dig donner") self.assertEqual( combine_two_chains("gnash", "sport"), "spash gnort", "Expected output: spash gnort", ) self.assertEqual(combine_two_chains("pezzy", "firm"), "fizzy perm", "Expected output: fizzy perm") myTests().main()

Develop the function is_palindrome that takes a string s as parameter and checks if s is a palindrome or not, returning True or False accordingly.

Examples:
is_palindrome("ivi") -> True
is_palindrome("civil") -> False

def is_palindrome(s): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(is_palindrome("ivi"), True, "Expected output: True") self.assertEqual(is_palindrome("civil"), False, "Expected output: False") self.assertEqual(is_palindrome("level"), True, "Expected output: True") self.assertEqual(is_palindrome("word"), False, "Expected output: False") self.assertEqual(is_palindrome("radar"), True, "Expected output: True") self.assertEqual(is_palindrome("kayak"), True, "Expected output: True") myTests().main()

Develop the function count_occurrences that takes two parameters: phrase and word, both of type string. The function should return the number of times that word occurs in phrase.

Examples:
count_occurrences("ana and mariana like amanatsu", "ana") -> 3

def count_occurrences(frase, palabra): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual( count_occurrences("ana and Mariana like amanatsu", "ana"), 3, "Expected output: 3", ) self.assertEqual(count_occurrences("Cats, rats, bats, and hats.", "ats"), 4, "Expected output: 4") myTests().main()

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