【ときどきpython】リスト内包表記 - not75743のscrapbox　～メモを書き殴るぜ～

【ときどきpython】リスト内包表記

内包表記を使わずにリストを生成

code:main.py

numbers = []

for i in range(1,11):

numbers.append(i)

print(numbers)

==> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

内包表記を使ってリストを生成

①

code:main.py

numbers = i for i in range(1,11)

print(numbers)

==> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

②

code:main.py

numbers = i ** 2 for i in range(1,11)

print(numbers)

==> 1, 4, 9, 16, 25, 36, 49, 64, 81, 100

ネストしたリストの内包表記

code:main.py

list1 = 1, 2, 3, 4 ,5

list2 = 6, 7, 8, 9, 10

kakezan = a * b for a in list1 for b in list2

print(kakezan)

==> 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 18, 21, 24, 27, 30, 24, 28, 32, 36, 40, 30, 35, 40, 45, 50

リスト内包表記でif文を使う

2で割り切れる数

code:main.py

numbers = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

even_numbers = i for i in numbers if i % 2 == 0

print(even_numbers)

==> 0, 2, 4, 6, 8, 10

ときどきpython