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Diffstat (limited to 'Doc/library/functools.rst')
| -rw-r--r-- | Doc/library/functools.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst index cedc3ad..bb7aac4 100644 --- a/Doc/library/functools.rst +++ b/Doc/library/functools.rst @@ -423,6 +423,20 @@ The :mod:`functools` module defines the following functions: for the base ``object`` type, which means it is used if no better implementation is found. + If an implementation registered to :term:`abstract base class`, virtual + subclasses will be dispatched to that implementation:: + + >>> from collections.abc import Mapping + >>> @fun.register + ... def _(arg: Mapping, verbose=False): + ... if verbose: + ... print("Keys & Values") + ... for key, value in arg.items(): + ... print(key, "=>", value) + ... + >>> fun({"a": "b"}) + a => b + To check which implementation will the generic function choose for a given type, use the ``dispatch()`` attribute:: |