3. Concatenation

3.1. A string cannot be modified

texto = " Hello world!" texto[0] = "@"

3.2. I can create new strings

• Using concatenation solves this problem

texto = "Hello world" texto = "@" + texto[1:] print(texto)

• Example of a program that reads a word and replaces the vowels with "*". The lower function transforms the letters to lowercase.

palabra = input("Word: ") k = 0 intercambio = "" while k < len(palabra): if palabra[k].lower() in "aeiou": intercambio = intercambio + "*" else: intercambio = intercambio + palabra[k] k += 1 print("New word %s" % intercambio)

3.3. Exercise

# Now create a program that reads a word, saves it in the variable “palabra”, # and replaces the consonants with “*”. Save the result in the variable “intercambio”. # You can use the previous program as a reference.

# Use the input function to read the word from the user. ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual( intercambio, "".join(["*" if c.lower() not in "aeiou" else c for c in palabra]), "Testing that intercambio is correctly assigned", ) myTests().main()

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