Module functional

Classes

• class LazyObject
  A wrapper for another class that can be used to delay instantiation of the wrapped class.
• class Promise
  Base class for the proxy class created in the closure of the lazy function. It's used to recognize promises in code.
• class SimpleLazyObject
  A lazy object initialized from any function.
• class cached_property
  Decorator that converts a method with a single self argument into a property cached on the instance.
• class classproperty
  Decorator that converts a method with a single cls argument into a property that can be accessed directly from the class.

Functions

• ▶ def keep_lazy(*resultclasses)

  A decorator that allows a function to be called with one or more lazy

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  arguments. If none of the args are lazy, the function is evaluated
  immediately, otherwise a __proxy__ is returned that will evaluate the
  function when needed.

  Reexports

  • Imported in django.utils.html.
• ▶ def keep_lazy_text(func)

  A decorator for functions that accept lazy arguments and return text.

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  Reexports

  • Imported in django.utils.html.
  • Imported in django.utils.http.
  • Imported in django.utils.text.
• ▶ def lazy(func, *resultclasses)

  Turn any callable into a lazy evaluated callable. result classes or types

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  is required -- at least one is needed so that the automatic forcing of
  the lazy evaluation code is triggered. Results are not memoized; the
  function is evaluated on every access.

  Reexports

  • Imported in django.contrib.auth.password_validation.
  • Imported in django.template.backends.utils.
  • Imported in django.template.context_processors.
  • Imported in django.urls.base.
  • Imported in django.utils.formats.
  • Imported in django.utils.text.
  • Imported in django.utils.translation.
• ▷ def lazystr(text)

  Shortcut for the common case of a lazy callable that returns str.

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• ▷ def new_method_proxy(func)

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• ▶ def partition(predicate, values)

  Split the values into two sets, based on the return value of the function (True/False). e.g.:

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  >>> partition(lambda x: x > 3, range(5))
      [0, 1, 2, 3], [4]

  Reexports

  • Imported in django.db.models.query.
• ▷ def unpickle_lazyobject(wrapped)

  Used to unpickle lazy objects. Just return its argument, which will be the wrapped object.

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