Php
Lists
p163 Unlinke strings, lists are mutable.
>>> numbers = [1, 2]
>>> numbers[1] = 3
>>> numbers
[1, 3]
>>> a = [1, 2, 3]
>>> b = [4, 5, 6]
>>> c = a + b
>>> c
[1, 2, 3, 4, 5, 6]
... 5 lines˄˄˄
>>> [2]*4
[2, 2, 2, 2]
... 2 lines˄˄˄
>>> list = ['a', 'b', 'c', 'd']
>>> list[1:3]
['b', 'c']
>>> list[2:]
['c', 'd']
>>> list[:2]
['a', 'b']
... 7 lines˄˄˄
RunCode
A = ['a', 'b', 'c']
A.append('d')
print(A) # ['a', 'b', 'c', 'd']
B = ['d', 'e']
A.extend(B)
print(A) # ['a', 'b', 'c', 'd', 'd', 'e']
A.reverse()
print(A) # ['e', 'd', 'd', 'c', 'b', 'a']
CodeCopy
def nested_sum(t):
total = 0
for el in t:
total += sum(el)
return total
t = [[1, 2], [3], [4, 5, 6]]
sum = nested_sum(t)
print(sum) # 21
... 8 lines˄˄˄ CodeCopy
def middle(t):
res = t[1:-1]
return res
res = middle([1, 2, 3, 4])
print(res) # [2, 3]
... 5 lines˄˄˄➥ Questions
CARD
16
32
