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【Udemy Python3入門+応用】 63. ジェネレーター内包表記

Posted at

※この記事はUdemyの
現役シリコンバレーエンジニアが教えるPython3入門+応用+アメリカのシリコンバレー流コードスタイル
の講座を受講した上での、自分用の授業ノートです。
講師の酒井潤さんから許可をいただいた上で公開しています。

##■ジェネレーター内包表記
#####◆普通に記述した場合

def g():
    for i in range(10):
        yield i

g = g()

print(type(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))

result
<class 'generator'>
0
1
2
3
4

#####◆ジェネレーター内包表記で記述した場合

g = (i for i in range(10))

print(type(g))

print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))
result
<class 'generator'>
0
1
2
3
4

一見tupleになりそうな見た目だが、ただ()を使うだけだとジェネレーターとなる。

g = tuple(i for i in range(10))

print(type(g))
print(g)
result
<class 'tuple'>
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

()の頭にtupleをつけることで、tupleを生成できる。

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