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5.24. Functions and Strings Write Code Questions

1. Write a function called start_a that takes in string as a parameter and returns True if the string starts with a lowercase a and False otherwise. For example, start_a('apple') should return True.

   ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(start_a('apple'),True,"start_a('apple')") self.assertEqual(start_a('cba'),False,"start_a('cba')") self.assertEqual(start_a('Apple'),False,"start_a('Apple')") self.assertEqual(start_a('basketball'),False,"start_a('basketball')") self.assertEqual(start_a('1abc'),False,"start_a('1abc')") myTests().main()

   Write a function called start_a that takes in string as a parameter and returns True if the string starts with a lowercase a and False otherwise. For example, start_a('apple') should return True.

   def start_a(string): return string.startswith('a')

2. Write a function called square_length that takes in area as a parameter and returns "A square with an area of (area) square feet has a side length of (side length) feet.". The side length is the square root of the area. Use math.sqrt(area) to get the square root of area. For example, square_length(36) should return "A square with an area of 36 square feet has a side length of 6.0 feet.".

   import math ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(square_length(36),"A square with an area of 36 square feet has a side length of 6.0 feet.","square_length(36)") self.assertEqual(square_length(101),"A square with an area of 101 square feet has a side length of 10.04987562112089 feet.","square_length(101)") self.assertEqual(square_length(0),"A square with an area of 0 square feet has a side length of 0.0 feet.","square_length(0)") myTests().main()

3. Write a function called use_semicolon that takes in sentence1 and sentence2 as parameters and returns both sentences joined by a semicolon with the correct grammar. This means that sentence1 shouldn’t have a terminal punctuation mark, there should be a space after the semicolon, and sentence2 should start with a lowercase letter. For example, use_semicolon('The sun is bright.', "Let's go outside.") should return "The sun is bright; let's go outside.". (Note: Assume both sentence1 and sentence2 are simple and complete sentences with proper grammar.)

   ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(use_semicolon('The sun is bright.', "Let's go outside."),"The sun is bright; let's go outside.","use_semicolon('The sun is bright.', 'Let's go outside.')") self.assertEqual(use_semicolon('Mary runs fast!', "It's amazing!"),"Mary runs fast; it's amazing!","use_semicolon('Mary runs fast!', 'It's amazing!')") self.assertEqual(use_semicolon('Dinner was great.', "How was yours?"),"Dinner was great; how was yours?","use_semicolon('Dinner was great.', 'How was yours?')") myTests().main()

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   Write a function called use_semicolon that takes in sentence1 and sentence2 as parameters and returns both sentences joined by a semicolon with the correct grammar. This means that sentence1 shouldn’t have a terminal punctuation mark, there should be a space after the semicolon, and sentence2 should start with a lowercase letter. For example, use_semicolon('The sun is bright.', "Let's go outside.") should return "The sun is bright; let's go outside.". (Note: Assume both sentence1 and sentence2 are simple and complete sentences with proper grammar.)

   def use_semicolon(sentence1, sentence2): return sentence1[:-1] + '; ' + sentence2[0].lower() + sentence2[1:]

4. Write a function called change that takes in string as a parameter and returns a new string with the first two characters uppercased, the last two characters lowercased, and the remaining characters in the middle moved to the front of the string with the first letter capitalized. For example, change('hello') should return "LHElo", and change('pumpkin') should return "MpkPUin". (Note: Don’t worry about accounting for strings that are 4 characters or less.)

   ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(change('hello'),"LHElo","change('hello')") self.assertEqual(change('pumpkin'),"MpkPUin","change('pumpkin')") self.assertEqual(change('october_november'),"Tober_novembOCer","change('october_november')") self.assertEqual(change('hellos'),"LlHEos","change('hellos')") self.assertEqual(change('OCTOBER!'),"TobeOCr!","change('OCTOBER!')") myTests().main()

5. Write a function called first_a_gone that takes in string as a parameter and returns a new string without the first lowercase ‘a’. For example, first_a_gone('australia') should return "ustralia". (Note: Don’t worry about accounting for strings that don’t have a lowercase ‘a’.)

   ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(first_a_gone('australia'),"ustralia","first_a_gone('australia')") self.assertEqual(first_a_gone('Australia'),"Austrlia","first_a_gone('Australia')") self.assertEqual(first_a_gone('praying'),"prying","first_a_gone('praying')") self.assertEqual(first_a_gone('apple'),"pple","first_a_gone('apple')") self.assertEqual(first_a_gone('passing'),"pssing","first_a_gone('passing')") self.assertEqual(first_a_gone('passing'),"pssing","first_a_gone('passing')") self.assertEqual(first_a_gone('bazaar'),"bzaar","first_a_gone('bazaar')") myTests().main()

   Write a function called first_a_gone that takes in string as a parameter and returns a new string without the first lowercase ‘a’. For example, first_a_gone('australia') should return "ustralia". (Note: Don’t worry about accounting for strings that don’t have a lowercase ‘a’.)

   def first_a_gone(string): capture_a = string.find('a') return string[:capture_a] + string[capture_a + 1:]

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