September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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210
第 6 章 関数とクラス
# ham
モジュールは、
spam.func_spam
をグローバル変数とする
import spam
func_ham = spam.func_spam
さらにもう一つのモジュール、
egg
で
ham
をインポートして、次のように
func_spam
を呼び出し
ます。
# egg
モジュールは、
ham
モジュールをインポートして、
func_spam
を呼び出す
import ham
ham.func_ham()
egg
モジュールでは、
ham
モジュールを経由して、
spam.func_spam()
関数を呼び出していま
す。このような呼び出し方をした場合でも、
func_spam()
が参照するグローバル名前空間は、常に
func_spam()
を定義した
spam
モジュールです。このように、呼び出し方にかかわらず、関数を作
成したモジュールが、常にその関数のグローバル名前空間として検索されます。
6.3.2
ローカル名前空間
現在の
CPython3
の実装では、関数実行中にローカル変数を参照するとき、辞書を使った名前空
間の検索は行われなくなりました。古いバージョンの
Python
では、ローカル名前空間の辞書を利
用した検索が行われていましたが、現在の
Python
では、ソースコードをコンパイルする際に使用
しているローカル変数を静的に検出し、検索よりも効率のよい方式で値を取得します。
この変更に伴って、
Python3
以降では、関数内では
from module import *
形式のインポートが
禁止されました。これは ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.