Quiz - 10

Develop the function cuantas_donas 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, cuantas_donas will return "many" instead of n.

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

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

Develop the function cadena_de_extremos 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:
cadena_de_extremos("palmeras") -> "paas"
cadena_de_extremos("a") -> ""

def cadena_de_extremos(s): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(cadena_de_extremos("palmeras"), "paas", "Expected output: paas") self.assertEqual(cadena_de_extremos("algoritmos"), "alos", "Expected output: alos") self.assertEqual(cadena_de_extremos("co"), "coco", "Expected output: coco") self.assertEqual(cadena_de_extremos("a"), "", "Expected output: ''") self.assertEqual(cadena_de_extremos("xyz"), "xyyz", "Expected output: xyyz") self.assertEqual(cadena_de_extremos(""), "", "Expected output: ''") myTests().main()

Develop the function remplazar_primer_caracter 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:
remplazar_primer_caracter("google") -> "goo*le"
remplazar_primer_caracter("dona") -> "dona"

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

Develop the function combinar_dos_cadenas 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:
combinar_dos_cadenas("mix", "pod") -> "pox mid"
combinar_dos_cadenas("pezzy", "firm") -> "fizzy perm"

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

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

Examples:
es_palindromo("asa") -> True
es_palindromo("casa") -> False

def es_palindromo(s): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(es_palindromo("asa"), True, "Expected output: True") self.assertEqual(es_palindromo("casa"), False, "Expected output: False") self.assertEqual(es_palindromo("reconocer"), True, "Expected output: True") self.assertEqual(es_palindromo("palabra"), False, "Expected output: False") self.assertEqual(es_palindromo("radar"), True, "Expected output: True") self.assertEqual(es_palindromo("seres"), True, "Expected output: True") myTests().main()

Develop the function contar_ocurrencias that takes two parameters: frase and palabra, both of type string. The function should return the number of times that palabra occurs in frase.

Examples:
contar_ocurrencias("a ana y a mariana les gustan las manzanas", "ana") -> 3

def contar_ocurrencias(frase, palabra): ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual( contar_ocurrencias("a ana y a mariana les gustan las manzanas", "ana"), 3, "Expected output: 3", ) self.assertEqual(contar_ocurrencias("Cats, rats, bats, and hats.", "ats"), 4, "Expected output: 4") myTests().main()

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