How do I use the if and else functions?

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How do I use the if and else functions?

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#1 by (4 votes)

2

I have problems with the if and else functions, I started my programming studies very soon and I did not quite understand how to use them.

Is it something like this?

número = 2
If número == 2:
Print("esse número é 2")
Else:
Print("esse número é diferente de 2")

python

asked by anonymous 02.02.2016 / 22:51

1 answer

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score 4 · Answer 1

To begin with, it's good to know that if and else are not functions. They are what we call conditional selection structures . The example you showed is correct (except for the indentation and the capitals in the if and the else).

If you just want to do something if a condition is true, use if

# código que vem antes
if 3 < 5:
    print("Três é menor que 5")
#código que vem depois

If you want to do something if a condition is true and something different if it is false, use if ... else :

umaVerdade = True

if umaVerdade:
    print("É verdade")
else:
    print("Não é verdade")

If you have multiple cases to consider, also use elif

entrada = input("Digite uma letra")

if entrada == "A" or entrada == "a":
    print("Você digitou a primeira letra do alfabeto português")
elif entrada == "Z" or entrada == "z":
    print("Você digitou a última letra do alfabeto português")
else:
    print("Você digitou uma coisa meio desinteressante")

Notice that you have else at the end. Before it can come how many elif are needed to cover all cases with specific treatments.