September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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265
7.4 ジェネレータ
ret = yield from
イテレータ
yield from
式にはイテレータを指定し、イテレータが終了するまで要素を呼び出し元に返しま
す。また、イテレータがジェネレータ関数なら、ジェネレータ関数が
return
文で返す値が、
yield
from
式の値となります。
yield from
式でイテレータとしてジェネレータが指定される場合、この
ジェネレータをサブジェネレータと呼びます。
yield from
を使うと、前述の処理をルーチンをサブルーチンに分割するように、ジェネレータ
をサブジェネレータに分割できます。
def _spam1():
ret = yield 1
ret = yield ret
return ret
def _spam2(ret):
ret = yield ret*2
yield ret*3
def spam():
ret = yield from _spam1()
yield from _spam2(ret)
7.4.3
ジェネレータ式
手軽にジェネレータを作成する手段として、リスト内包などとよく似た形式で記述できるジェネ
レータ式も用意されています。
(
式
for
変数名
in
イテラブルオブジェクト
)
ジェネレータ式は、イテラブルオブジェクトから要素を一つづつ取得し、変数名に代入します。
要素を取得するたびに式を評価し、結果を
yield
します。
次のジェネレータ式
gen = (x**2 for x in range(10))
は、次の関数定義のようなジェネレータを作成します。 ...
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