3. Concatenation

3.1. A string cannot be modified

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texto = " Hello world!"

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texto[0] = "@"

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Activity: 3.1.1 ActiveCode (ac_l18_3a_en)

3.2. I can create new strings

• Using concatenation solves this problem

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texto = "Hello world"

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texto = "@" + texto[1:]

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print(texto)

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Activity: 3.2.1 ActiveCode (ac_l18_3b_en)

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

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palabra = input("Word: ")

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k = 0

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intercambio = ""

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while k < len(palabra):

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    if palabra[k].lower() in "aeiou":

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        intercambio = intercambio + "*"

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    else:

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        intercambio = intercambio + palabra[k]

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    k += 1

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print("New word %s" % intercambio)

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Activity: 3.2.2 ActiveCode (ac_l18_3c_en)

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.

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# Use the input function to read the word from the user.

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Activity: 3.3.1 ActiveCode (ac_l18_3d_en)

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