Python リスト内包表記：追加、ソート、長さ

list of integers =  [1, 2, 3, 8, 33]
list of animals = ['dog', 'cat', 'goat']
list of names = ['John', 'Travis', 'Sheila']
list of floating numbers = [2.2, 4.5, 9.8, 10.4]

[2, 'cat', 34.33, 'Travis']
[2.22, 33, 'pen']

list = [3, 22, 30, 5.3, 20]

list[0] to access 3
list[1] to access 22
list[2] to access 30
list[3] to access 5.3
list[4] to access 20

list[-1] = 20

list[:] = [3, 22, 30, 5.3, 20] (all the members of the list];
list[1:3] = [22, 30] (members of the list from index 1 to index 3, without the member at index 3);
list[:4] = [3, 22, 30, 5.3] (members of the list from index 0 to index 4, without the member at index 4)
list[2:-1] = [30, 5.3] (members of the list from index 2, which is the third element, to the second to the last element in the list, which is 5.3).

list[2:-1] = [30, 5.3]

list = [physics, chemistry, mathematics]
    list[0] = biology
    print(list)

integers = [2, 5, 9, 20, 27]
           integers[1] = 10
           print(integers)

>>> [2, 10, 9, 20, 27]

integers = [2, 5, 9, 20, 27]
           integers[-1] = 30.5
           print(integers)

>>> [2, 5, 9, 20, 30.5]

list_1 = [3, 5, 7, 8, 9, 20]
    list_1.append(3.33)
    print(list_1)

    >>> list_1 = [3, 5, 7, 8, 9, 20, 3.33]

    list_1.append("cats")
    print(list_1)
    >>> list_1 = [3, 5, 7, 8, 9, 20, 3.33, "cats"]

numbers = [2, 5, 7, 9]
print(len(numbers))
>>> 4

numbers = [2, 5, 7, 9]
print(max(numbers))
>>> 9

numbers = [2, 5, 7, 9]
print(min(numbers))
>>> 2

animals = (cat, dog, fish, cow)
print(list(animals))
>>> [cat, dog, fish, cow]

numbers = [2, 5, 7, 9]
numbers.append(15)
print(numbers)
>>> [2, 5, 7, 9, 15]

numbers = [2, 5, 7, 9, 15]
numbers.pop(2)
print(numbers)
>>> [2, 5, 9, 15]

values = [2, 5, 7, 9]
values.remove(2)
print(values)
>>> [5, 7, 9]

values = [2, 5, 7, 10]
values.reverse()
print(values)
>>> [10, 7, 5, 2]

animals = ['cat', 'dog', 'fish', 'cow', 'goat']
fish_index = animals.index('fish')
print(fish_index)
>>> 2

values = [2, 5, 10]
sum_of_values = sum(values)
print(sum_of_values)

>>> 17

values = [1, 7, 9, 3, 5]
# To sort the values in ascending order:
values.sort()
print(values)

>>> [1, 3, 5, 7, 9]

values = [2, 10, 7, 14, 50]
# To sort the values in descending order:
values.sort(reverse = True)
print(values)

>>> [50, 14, 10, 7, 2]

# to sort the list by length of the elements
strings = ['cat', 'mammal', 'goat', 'is']
sort_by_alphabet = strings.sort()
sort_by_length = strings.sort(key = len)
print(sort_by_alphabet)
print(sort_by_length)

>>> ['cat', 'goat', 'is', 'mammal']
        ['is', 'cat', 'goat', 'mammal']

for elem in list:
        elem = elem + 5
        print(elem)
    
    >>>>15
        25
        35
        45
        55
        65
        75

for elem in list[:3]:
    list.remove(elem)

    >>>list = [40, 50, 60, 70]

new_list = []	
    for elem in list[2:]:
        new_list.append(elem)
        print(“New List: {}”.format(new_list))
    
   Output:
	New List: [30, 40, 50, 60, 70]

list_of squares = []
    for int in range(1, 10):
        square = int ** 2
        list_of_squares.append(square)

    print(list_of_squares)

List_of_squares using for loop:

    [1, 4, 9, 16, 25, 36, 49, 64, 81]

list_of_squares_2 = [int**2 for int in range(1, 10)]

    print('List of squares using list comprehension: {}'.format(list_of_squares_2))

Output using list comprehension:

    [1, 4, 9, 16, 25, 36, 49, 64, 81]