Qiita Teams that are logged in
You are not logged in to any team

Log in to Qiita Team
Community
OrganizationAdvent CalendarQiitadon (β)
Service
Qiita JobsQiita ZineQiita Blog
3
Help us understand the problem. What is going on with this article?
@hikurochan

内包表記

More than 1 year has passed since last update.

リスト内包表記

l = []
for i in range(10):
    if i % 2 == 0:
        l.append(i)
print(l)

同じことがリスト内包表記では下記のようになる

l = [i for i in range(10) if i % 2 ==0]
print(l)
出力
[0, 2, 4, 6, 8]

辞書内包表記

w = ['Monday', 'Tuesday','Friday']
f = ['banana', 'apple', 'orange']
d= {}
for x, y in zip(w,f):
    d[x]=y
print(d)

同じことが辞書内包表記では下記のようになる

w = ['Monday', 'Tuesday','Friday']
f = ['banana', 'apple', 'orange']
d = {x:y for x,y in zip(w,f)}
print(d)
出力
{'Monday': 'banana', 'Tuesday': 'apple', 'Friday': 'orange'}

集合内包表記

s = set()
for i in range(10):
    if i % 2 == 0:
        s.add(i)
print(s)

同じことが集合内包表記では下記のようになる

s = {i for i in range(10) if i % 2 == 0}
print(s)
出力
{0, 2, 4, 6, 8}

ジェネレータ式

def g():
    for i in range(10):
        if i % 2 == 0:
            yield i
g = g()
print(next(g))
print(next(g))
print(next(g))
print(next(g))

同じことがジェネレータ式では下記のようになる。

g = (i for i in range(10) if i % 2 == 0)
print(next(g))
print(next(g))
print(next(g))
print(next(g))
出力
0
2
4
6

なお、公式ドキュメントに「ジェネレータ表記法」と書いてあり「ジェネレータ内包表記」ではない。
https://docs.python.org/ja/3/reference/expressions.html#generator-expressions

ジェネレータ式 (generator expression) とは、丸括弧を使ったコンパクトなジェネレータ表記法です:
ジェネレータ式は新たなジェネレータオブジェクトを与えます。この構文は内包表記とほぼ同じですが、角括弧や波括弧ではなく、丸括弧で囲まれます。

3
Help us understand the problem. What is going on with this article?
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away

Comments

No comments
Sign up for free and join this conversation.
Sign Up
If you already have a Qiita account Login
3
Help us understand the problem. What is going on with this article?