object: dictionary
builtin: hash
- Called for the key object for dictionary operations, and by the built-in
- function :func:`hash`. Should return an integer usable as a hash value
- for dictionary operations. The only required property is that objects which
- compare equal have the same hash value; it is advised to somehow mix together
- (e.g., using exclusive or) the hash values for the components of the object that
- also play a part in comparison of objects.
+ Called by built-in function :func:`hash` and for operations on members of
+ hashed collections including :class:`set`, :class:`frozenset`, and
+ :class:`dict`. :meth:`__hash__` should return an integer. The only required
+ property is that objects which compare equal have the same hash value; it is
+ advised to somehow mix together (e.g. using exclusive or) the hash values for
+ the components of the object that also play a part in comparison of objects.
If a class does not define an :meth:`__eq__` method it should not define a
:meth:`__hash__` operation either; if it defines :meth:`__eq__` but not
- :meth:`__hash__`, its instances will not be usable as dictionary keys. If a
- class defines mutable objects and implements an :meth:`__eq__` method, it
- should not implement :meth:`__hash__`, since the dictionary implementation
- requires that a key's hash value is immutable (if the object's hash value
- changes, it will be in the wrong hash bucket).
+ :meth:`__hash__`, its instances will not be usable as items in hashable
+ collections. If a class defines mutable objects and implements an
+ :meth:`__eq__` method, it should not implement :meth:`__hash__`, since the
+ implementation of hashable collections requires that a key's hash value is
+ immutable (if the object's hash value changes, it will be in the wrong hash
+ bucket).
+
User-defined classes have :meth:`__eq__` and :meth:`__hash__` methods
by default; with them, all objects compare unequal (except with themselves)
<p>To download an archive containing all the documents for this version of
Python in one of various formats, follow one of links in this table. The numbers
-in the table are the size of the download files in Kilobytes.</p>
+in the table are the size of the download files in megabytes.</p>
<table class="docutils">
<tr><th>Format</th><th>Packed as .zip</th><th>Packed as .tar.bz2</th></tr>
<h2>Problems</h2>
<p>If you have comments or suggestions for the Python documentation, please send
-email to <a href="docs@python.org">docs@python.org</a>.</p>
+email to <a href="mailto:docs@python.org">docs@python.org</a>.</p>
{% endif %}
{% endblock %}
"""
if module is None:
return True
+ elif inspect.getmodule(object) is not None:
+ return module is inspect.getmodule(object)
elif inspect.isfunction(object):
return module.__dict__ is object.__globals__
elif inspect.isclass(object):
return module.__name__ == object.__module__
- elif inspect.getmodule(object) is not None:
- return module is inspect.getmodule(object)
elif hasattr(object, '__module__'):
return module.__name__ == object.__module__
elif isinstance(object, property):