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pep-562.rst

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-PEP: 562
-Title: Module __getattr__
-Author: Ivan Levkivskyi <levkivskyi@gmail.com>
-Status: Draft
-Type: Standards Track
-Content-Type: text/x-rst
-Created: 09-Sep-2017
-Python-Version: 3.7
-Post-History: 09-Sep-2017
-
-
-Abstract
-========
-
-It is proposed to support ``__getattr__`` function defined on modules to
-provide basic customization of module attribute access.
-
-
-Rationale
-=========
-
-It is sometimes convenient to customize or otherwise have control over
-access to module attributes. A typical example is managing deprecation
-warnings. Typical workarounds are assigning ``__class__`` of a module object
-to a custom subclass of ``types.ModuleType`` or substituting ``sys.modules``
-item with a custom wrapper instance. It would be convenient to simplify this
-procedure by recognizing ``__getattr__`` defined directly in a module that
-would act like a normal ``__getattr__`` method, except that it will be defined
-on module *instances*. For example::
-
-  # lib.py
-
-  from warnings import warn
-
-  deprecated_names = ["old_function", ...]
-
-  def _deprecated_old_function(arg, other):
-      ...
-
-  def __getattr__(name):
-      if name in deprecated_names:
-          warn(f"{name} is deprecated", DeprecationWarning)
-          return globals()[f"_deprecated_{name}"]
-      raise AttributeError(f"module {__name__} has no attribute {name}")
-
-  # main.py
-
-  from lib import old_function  # Works, but emits the warning
-
-There is a related proposal PEP 549 that proposes to support instance
-properties for a similar functionality. The difference is this PEP proposes
-a faster and simpler mechanism, but provides more basic customization.
-An additional motivation for this proposal is that PEP 484 already defines
-the use of module ``__getattr__`` for this purpose in Python stub files,
-see [1]_.
-
-
-Specification
-=============
-
-The ``__getattr__`` function at the module level should accept one argument
-which is a name of an attribute and return the computed value or raise
-an ``AttributeError``::
-
-  def __getattr__(name: str) -> Any: ...
-
-This function will be called only if ``name`` is not found in the module
-through the normal attribute lookup.
-
-The reference implementation for this PEP can be found in [2]_.
-
-
-Backwards compatibility and impact on performance
-=================================================
-
-This PEP may break code that uses module level (global) name ``__getattr__``.
-The performance implications of this PEP are minimal, since ``__getattr__``
-is called only for missing attributes.
-
-
-References
-==========
-
-.. [1] PEP 484 section about ``__getattr__`` in stub files
-   (https://www.python.org/dev/peps/pep-0484/#stub-files)
-
-.. [2] The reference implementation
-   (https://github.com/ilevkivskyi/cpython/pull/3/files)
-
-
-Copyright
-=========
-
-This document has been placed in the public domain.
-
-
-
-..
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