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Listy
Listy są bardzo podobne do tablic. Mogą zawierać dowolny typ zmiennych i mogą zawierać tyle zmiennych, ile tylko zechcesz. Listy można również iterować w bardzo prosty sposób. Oto przykład, jak stworzyć listę.
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)
Dostęp do indeksu, który nie istnieje, generuje wyjątek (błąd).
mylist = [1,2,3]
print(mylist[10])
Ćwiczenie
W tym ćwiczeniu musisz dodać liczby i ciągi do odpowiednich list, używając metody listy "append". Musisz dodać liczby 1,2 i 3 do listy "numbers", a słowa 'hello' i 'world' do zmiennej strings.
Musisz również uzupełnić zmienną second_name drugim imieniem z listy names, używając operatora nawiasów []. Zauważ, że indeks jest numerowany od zera, więc jeśli chcesz uzyskać dostęp do drugiego elementu na liście, jego indeks to 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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