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Lijsten


Lijsten lijken erg op arrays. Ze kunnen elke soort variabele bevatten en zoveel variabelen als je wenst. Lijsten kunnen ook op een zeer eenvoudige manier worden geïterateerd. Hier is een voorbeeld van hoe je een lijst kunt opbouwen.

```python mylist = [] mylist.append(1) mylist.append(2) mylist.append(3) print(mylist[0]) # prints 1 print(mylist[1]) # prints 2 print(mylist[2]) # prints 3

prints out 1,2,3

for x in mylist: print(x) ```

Toegang tot een index die niet bestaat genereert een uitzondering (een fout).

python mylist = [1,2,3] print(mylist[10])

Exercise

In deze oefening moet je getallen en strings toevoegen aan de juiste lijsten met behulp van de "append"-lijstmethode. Je moet de getallen 1, 2 en 3 toevoegen aan de "numbers" lijst, en de woorden 'hello' en 'world' aan de strings-variabele.

Je moet ook de variabele second_name vullen met de tweede naam in de names lijst, met behulp van de haakjesoperator []. Merk op dat de index nul-gebaseerd is, dus als je toegang wilt tot het tweede item in de lijst, is de index 1.

numbers = [] strings = [] names = ["John", "Eric", "Jessica"] # write your code here second_name = None # this code should write out the filled arrays and the second name in the names list (Eric). print(numbers) print(strings) print("The second name on the names list is %s" % second_name) numbers = [] strings = [] names = ["John", "Eric", "Jessica"] # write your code here numbers.append(1) numbers.append(2) numbers.append(3) strings.append("hello") strings.append("world") second_name = names[1] # this code should write out the filled arrays and the second name in the names list (Eric). print(numbers) print(strings) print("The second name on the names list is %s" % second_name) test_output_contains("[1,2,3]", no_output_msg= "Make sure that you have printed the `numbers` list.") test_output_contains("['hello', 'world']", no_output_msg= "Make sure that you have printed the `strings` list.") test_output_contains("The second name on the names list is Eric", no_output_msg= "Did you fill in the variable `second_name` with the second name in the names list?") success_msg("Great Job!")

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