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Библиотека Python разработчика | Книги по питону | United States America (US)
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Некоторые модули могут содержать такие запутанные конструкции:


try:
    cache
except NameError:
    cache = {}


На первый взгляд, в этом нет смысла: cache однозначно вызовет NameError в начале модуля, так как переменной ранее не присваивалось значение.

Однако это не так, если модуль перезагружается. В этом случае словарь, содержащий все атрибуты модуля, повторно используется, что даёт модулю возможность повторно использовать атрибуты своего предыдущего экземпляра. Если модуль спроектирован с учётом возможности перезагрузки, он может опираться на эту особенность. Например, приведённый выше код сохранить кэш при перезагрузке модуля.

👉@BookPython

Библиотека Python разработчика | Книги по питону
Некоторые модули могут содержать такие запутанные конструкции:


try:
    cache
except NameError:
    cache = {}


На первый взгляд, в этом нет смысла: cache однозначно вызовет NameError в начале модуля, так как переменной ранее не присваивалось значение.

Однако это не так, если модуль перезагружается. В этом случае словарь, содержащий все атрибуты модуля, повторно используется, что даёт модулю возможность повторно использовать атрибуты своего предыдущего экземпляра. Если модуль спроектирован с учётом возможности перезагрузки, он может опираться на эту особенность. Например, приведённый выше код сохранить кэш при перезагрузке модуля.

👉@BookPython
hottg.com/BookPython/3658
2.5K views


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Библиотека Python разработчика | Книги по питону



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Некоторые модули могут содержать такие запутанные конструкции:

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