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Add some internal links.
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@@ -27,7 +27,7 @@ Glossary
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:ref:`2to3-reference`.
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abstract base class
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Abstract Base Classes (abbreviated ABCs) complement :term:`duck-typing` by
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:ref:`abstract-base-classes` complement :term:`duck-typing` by
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providing a way to define interfaces when other techniques like
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:func:`hasattr` would be clumsy. Python comes with many built-in ABCs for
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data structures (in the :mod:`collections` module), numbers (in the
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@@ -27,10 +27,9 @@ Python's general purpose built-in containers, :class:`dict`, :class:`list`,
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:class:`defaultdict` dict subclass that calls a factory function to supply missing values .. versionadded:: 2.5
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===================== ==================================================================== ===========================
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In addition to containers, the collections module provides some ABCs
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(abstract base classes) that can be used to test whether a class
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provides a particular interface, for example, whether it is hashable or
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a mapping.
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In addition to the concrete container classes, the collections module provides
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:ref:`abstract-base-classes` that can be used to test whether a class provides a
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particular interface, for example, whether it is hashable or a mapping.
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.. seealso::
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