5.36. Functions and Loops Write Code Questions

1. Write a function called list_starts_with_a that takes in lst as a parameter and returns a new list with the words from lst that start with “a”. For example, list_starts_with_a(["alphabet", "apple", "banana", "coding", "amazing"]) would return ["alphabet", "apple", "amazing"].

   def list_starts_with_a(lst): # write code here print(list_starts_with_a(["alphabet", "apple", "banana", "coding", "amazing"])) ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(list_starts_with_a(['alphabet', 'apple', 'banana', 'coding', 'amazing']),['alphabet', 'apple', 'amazing'],"list_starts_with_a(['alphabet', 'apple', 'banana', 'coding', 'amazing'])") self.assertEqual(list_starts_with_a(['alphabet', 'apple', 'amazing']),['alphabet', 'apple', 'amazing'],"list_starts_with_a(['alphabet', 'apple', 'amazing'])") self.assertEqual(list_starts_with_a(['banana', 'coding']),[],"list_starts_with_a(['banana', 'coding'])") self.assertEqual(list_starts_with_a([]),[],"list_starts_with_a([])") myTests().main()

   Write a function called list_starts_with_a that takes in lst as a parameter and returns a new list with the words from lst that start with “a”. For example, list_starts_with_a(["alphabet", "apple", "banana", "coding", "amazing"]) would return ["alphabet", "apple", "amazing"].

   def list_starts_with_a(lst): list_a = [] for word in lst: if word.startswith('a'): list_a.append(word) return list_a print(list_starts_with_a(["alphabet", "apple", "banana", "coding", "amazing"]))

2. Write a function called sentence_without_vowels that takes in string as a parameter and returns a new string that consists of only characters that are not vowels. For example, sentence_without_vowels('apple') would return "ppl".

   def sentence_without_vowels(string): # write code here ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(sentence_without_vowels('apple'),"ppl","sentence_without_vowels('apple')") self.assertEqual(sentence_without_vowels('soup'),"sp","sentence_without_vowels('soup')") self.assertEqual(sentence_without_vowels('coding'),"cdng","sentence_without_vowels('coding')") self.assertEqual(sentence_without_vowels('Hi!'),"H!","sentence_without_vowels('Hi!')") self.assertEqual(sentence_without_vowels(' ')," ","sentence_without_vowels(' ')") myTests().main()

3. Write a function called draw_square that takes in num as a parameter and returns a string that consists of a square made of “*” with the dimensions num times num. Note: ignore values that are less than or equal to zero. For example, draw_square(4) would return "****\n****\n****\n****".

   def draw_square(num): # write code here ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(draw_square(4),"****\n****\n****\n****","draw_square(4)") self.assertEqual(draw_square(1),"*","draw_square(1)") myTests().main()

   Write a function called draw_square that takes in num as a parameter and returns a string that consists of a square made of “*” with the dimensions num times num. Note: ignore values that are less than or equal to zero. For example, draw_square(4) would return "****\n****\n****\n****".

   def draw_square(num): string1 = "" for i in range(num): if i < (num - 1): string1 += "*" * num + "\n" else: string1 += "*" * num return string1 print(draw_square(4))

4. Write a function called check_prime_num that takes in num as a parameter and returns True if num is a prime number and False otherwise. For the purposes of this question, there is no need to test for values of num that are less than two. For example, check_prime_num(5) should return True.

   def check_prime_num(num): # write code here ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(check_prime_num(4),False,"check_prime_num(4)") self.assertEqual(check_prime_num(5),True,"check_prime_num(5)") self.assertEqual(check_prime_num(100),False,"check_prime_num(100)") self.assertEqual(check_prime_num(89),True,"check_prime_num(89)") myTests().main()

5. Write a function called factorial that takes in num as a parameter and returns the factorial value. Ignore checking numbers that are less than 1. For example, factorial(5) would return 120.

   def factorial(num): # write code here ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(factorial(5), 120, "factorial(5)") self.assertEqual(factorial(1), 1, "factorial(1)") self.assertEqual(factorial(4), 24, "factorial(4)") self.assertEqual(factorial(12), 479001600, "factorial(12)") myTests().main()

   Write a function called factorial that takes in num as a parameter and returns the factorial value. Ignore checking numbers that are less than 1. For example, factorial(5) would return 120.

   def factorial(num): total = num while num > 1: num -= 1 total *= num return total

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