mirror of https://github.com/python/cpython
In stdtypes.rst, move methods under class directives where applicable
This commit is contained in:
Benjamin Peterson
parent
f466c2a247
commit
54718dd691
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@ -1502,161 +1502,162 @@ The constructors for both classes work the same:
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sets, the inner sets must be :class:`frozenset` objects. If *iterable* is
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not specified, a new empty set is returned.
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Instances of :class:`set` and :class:`frozenset` provide the following
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operations:
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Instances of :class:`set` and :class:`frozenset` provide the following
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operations:
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.. describe:: len(s)
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.. describe:: len(s)
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Return the cardinality of set *s*.
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Return the cardinality of set *s*.
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.. describe:: x in s
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.. describe:: x in s
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Test *x* for membership in *s*.
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Test *x* for membership in *s*.
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.. describe:: x not in s
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.. describe:: x not in s
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Test *x* for non-membership in *s*.
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Test *x* for non-membership in *s*.
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.. method:: set.isdisjoint(other)
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.. method:: isdisjoint(other)
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Return True if the set has no elements in common with *other*.
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Sets are disjoint if and only if their interesection is the empty set.
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Return True if the set has no elements in common with *other*. Sets are
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disjoint if and only if their interesection is the empty set.
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.. versionadded:: 2.6
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.. versionadded:: 2.6
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.. method:: set.issubset(other)
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set <= other
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.. method:: issubset(other)
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set <= other
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Test whether every element in the set is in *other*.
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Test whether every element in the set is in *other*.
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.. method:: set < other
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.. method:: set < other
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Test whether the set is a true subset of *other*, that is,
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``set <= other and set != other``.
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Test whether the set is a true subset of *other*, that is,
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``set <= other and set != other``.
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.. method:: set.issuperset(other)
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set >= other
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.. method:: issuperset(other)
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set >= other
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Test whether every element in *other* is in the set.
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Test whether every element in *other* is in the set.
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.. method:: set > other
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.. method:: set > other
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Test whether the set is a true superset of *other*, that is,
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``set >= other and set != other``.
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Test whether the set is a true superset of *other*, that is, ``set >=
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other and set != other``.
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.. method:: set.union(other)
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set | other
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.. method:: union(other)
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set | other
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Return a new set with elements from both sets.
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Return a new set with elements from both sets.
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.. method:: set.intersection(other)
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set & other
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.. method:: intersection(other)
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set & other
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Return a new set with elements common to both sets.
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Return a new set with elements common to both sets.
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.. method:: set.difference(other)
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set - other
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.. method:: difference(other)
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set - other
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Return a new set with elements in the set that are not in *other*.
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Return a new set with elements in the set that are not in *other*.
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.. method:: set.symmetric_difference(other)
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set ^ other
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.. method:: symmetric_difference(other)
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set ^ other
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Return a new set with elements in either the set or *other* but not both.
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Return a new set with elements in either the set or *other* but not both.
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.. method:: set.copy()
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.. method:: copy()
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Return a new set with a shallow copy of *s*.
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Return a new set with a shallow copy of *s*.
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Note, the non-operator versions of :meth:`union`, :meth:`intersection`,
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:meth:`difference`, and :meth:`symmetric_difference`, :meth:`issubset`, and
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:meth:`issuperset` methods will accept any iterable as an argument. In
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contrast, their operator based counterparts require their arguments to be sets.
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This precludes error-prone constructions like ``set('abc') & 'cbs'`` in favor of
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the more readable ``set('abc').intersection('cbs')``.
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Note, the non-operator versions of :meth:`union`, :meth:`intersection`,
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:meth:`difference`, and :meth:`symmetric_difference`, :meth:`issubset`, and
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:meth:`issuperset` methods will accept any iterable as an argument. In
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contrast, their operator based counterparts require their arguments to be
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sets. This precludes error-prone constructions like ``set('abc') & 'cbs'``
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in favor of the more readable ``set('abc').intersection('cbs')``.
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Both :class:`set` and :class:`frozenset` support set to set comparisons. Two
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sets are equal if and only if every element of each set is contained in the
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other (each is a subset of the other). A set is less than another set if and
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only if the first set is a proper subset of the second set (is a subset, but is
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not equal). A set is greater than another set if and only if the first set is a
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proper superset of the second set (is a superset, but is not equal).
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Both :class:`set` and :class:`frozenset` support set to set comparisons. Two
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sets are equal if and only if every element of each set is contained in the
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other (each is a subset of the other). A set is less than another set if and
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only if the first set is a proper subset of the second set (is a subset, but
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is not equal). A set is greater than another set if and only if the first set
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is a proper superset of the second set (is a superset, but is not equal).
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Instances of :class:`set` are compared to instances of :class:`frozenset` based
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on their members. For example, ``set('abc') == frozenset('abc')`` returns
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``True`` and so does ``set('abc') in set([frozenset('abc')])``.
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Instances of :class:`set` are compared to instances of :class:`frozenset`
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based on their members. For example, ``set('abc') == frozenset('abc')``
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returns ``True`` and so does ``set('abc') in set([frozenset('abc')])``.
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The subset and equality comparisons do not generalize to a complete ordering
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function. For example, any two disjoint sets are not equal and are not subsets
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of each other, so *all* of the following return ``False``: ``a<b``, ``a==b``,
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or ``a>b``. Accordingly, sets do not implement the :meth:`__cmp__` method.
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The subset and equality comparisons do not generalize to a complete ordering
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function. For example, any two disjoint sets are not equal and are not
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subsets of each other, so *all* of the following return ``False``: ``a<b``,
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``a==b``, or ``a>b``. Accordingly, sets do not implement the :meth:`__cmp__`
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method.
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Since sets only define partial ordering (subset relationships), the output of
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the :meth:`list.sort` method is undefined for lists of sets.
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Since sets only define partial ordering (subset relationships), the output of
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the :meth:`list.sort` method is undefined for lists of sets.
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Set elements, like dictionary keys, must be :term:`hashable`.
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Set elements, like dictionary keys, must be :term:`hashable`.
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Binary operations that mix :class:`set` instances with :class:`frozenset` return
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the type of the first operand. For example: ``frozenset('ab') | set('bc')``
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returns an instance of :class:`frozenset`.
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Binary operations that mix :class:`set` instances with :class:`frozenset`
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return the type of the first operand. For example: ``frozenset('ab') |
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set('bc')`` returns an instance of :class:`frozenset`.
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The following table lists operations available for :class:`set` that do not
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apply to immutable instances of :class:`frozenset`:
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The following table lists operations available for :class:`set` that do not
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apply to immutable instances of :class:`frozenset`:
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.. method:: set.update(other)
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set |= other
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.. method:: update(other)
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set |= other
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Update the set, adding elements from *other*.
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Update the set, adding elements from *other*.
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.. method:: set.intersection_update(other)
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set &= other
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.. method:: intersection_update(other)
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set &= other
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Update the set, keeping only elements found in it and *other*.
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Update the set, keeping only elements found in it and *other*.
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.. method:: set.difference_update(other)
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set -= other
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.. method:: difference_update(other)
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set -= other
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Update the set, removing elements found in *other*.
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Update the set, removing elements found in *other*.
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.. method:: set.symmetric_difference_update(other)
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set ^= other
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.. method:: symmetric_difference_update(other)
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set ^= other
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Update the set, keeping only elements found in either set, but not in both.
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Update the set, keeping only elements found in either set, but not in both.
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.. method:: set.add(elem)
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.. method:: add(elem)
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Add element *elem* to the set.
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Add element *elem* to the set.
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.. method:: set.remove(elem)
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.. method:: remove(elem)
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Remove element *elem* from the set. Raises :exc:`KeyError` if *elem* is not
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contained in the set.
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Remove element *elem* from the set. Raises :exc:`KeyError` if *elem* is
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not contained in the set.
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.. method:: set.discard(elem)
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.. method:: discard(elem)
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Remove element *elem* from the set if it is present.
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Remove element *elem* from the set if it is present.
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.. method:: set.pop()
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.. method:: pop()
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Remove and return an arbitrary element from the set. Raises :exc:`KeyError`
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if the set is empty.
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Remove and return an arbitrary element from the set. Raises
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:exc:`KeyError` if the set is empty.
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.. method:: set.clear()
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.. method:: clear()
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Remove all elements from the set.
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Remove all elements from the set.
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Note, the non-operator versions of the :meth:`update`,
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:meth:`intersection_update`, :meth:`difference_update`, and
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:meth:`symmetric_difference_update` methods will accept any iterable as an
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argument.
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Note, the non-operator versions of the :meth:`update`,
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:meth:`intersection_update`, :meth:`difference_update`, and
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:meth:`symmetric_difference_update` methods will accept any iterable as an
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argument.
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Note, the *elem* argument to the :meth:`__contains__`, :meth:`remove`, and
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:meth:`discard` methods may be a set. To support searching for an equivalent
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frozenset, the *elem* set is temporarily mutated during the search and then
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restored. During the search, the *elem* set should not be read or mutated
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since it does not have a meaningful value.
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Note, the *elem* argument to the :meth:`__contains__`, :meth:`remove`, and
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:meth:`discard` methods may be a set. To support searching for an equivalent
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frozenset, the *elem* set is temporarily mutated during the search and then
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restored. During the search, the *elem* set should not be read or mutated
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since it does not have a meaningful value.
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.. seealso::
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@ -1733,159 +1734,162 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
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Support for building a dictionary from keyword arguments added.
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These are the operations that dictionaries support (and therefore, custom mapping
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types should support too):
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These are the operations that dictionaries support (and therefore, custom
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mapping types should support too):
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.. describe:: len(d)
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.. describe:: len(d)
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Return the number of items in the dictionary *d*.
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Return the number of items in the dictionary *d*.
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.. describe:: d[key]
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.. describe:: d[key]
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Return the item of *d* with key *key*. Raises a :exc:`KeyError` if *key* is
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not in the map.
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.. versionadded:: 2.5
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If a subclass of dict defines a method :meth:`__missing__`, if the key
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*key* is not present, the ``d[key]`` operation calls that method with the
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key *key* as argument. The ``d[key]`` operation then returns or raises
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whatever is returned or raised by the ``__missing__(key)`` call if the key
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is not present. No other operations or methods invoke
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:meth:`__missing__`. If :meth:`__missing__` is not defined,
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:exc:`KeyError` is raised. :meth:`__missing__` must be a method; it
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cannot be an instance variable. For an example, see
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:class:`collections.defaultdict`.
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Return the item of *d* with key *key*. Raises a :exc:`KeyError` if *key*
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is not in the map.
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.. describe:: d[key] = value
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.. versionadded:: 2.5
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If a subclass of dict defines a method :meth:`__missing__`, if the key
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*key* is not present, the ``d[key]`` operation calls that method with
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the key *key* as argument. The ``d[key]`` operation then returns or
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raises whatever is returned or raised by the ``__missing__(key)`` call
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if the key is not present. No other operations or methods invoke
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:meth:`__missing__`. If :meth:`__missing__` is not defined,
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:exc:`KeyError` is raised. :meth:`__missing__` must be a method; it
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cannot be an instance variable. For an example, see
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:class:`collections.defaultdict`.
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Set ``d[key]`` to *value*.
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.. describe:: d[key] = value
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.. describe:: del d[key]
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Set ``d[key]`` to *value*.
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Remove ``d[key]`` from *d*. Raises a :exc:`KeyError` if *key* is not in the
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map.
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.. describe:: del d[key]
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.. describe:: key in d
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Remove ``d[key]`` from *d*. Raises a :exc:`KeyError` if *key* is not in the
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map.
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Return ``True`` if *d* has a key *key*, else ``False``.
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.. describe:: key in d
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.. versionadded:: 2.2
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Return ``True`` if *d* has a key *key*, else ``False``.
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.. describe:: key not in d
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.. versionadded:: 2.2
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Equivalent to ``not key in d``.
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.. describe:: key not in d
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.. versionadded:: 2.2
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Equivalent to ``not key in d``.
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.. method:: dict.clear()
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.. versionadded:: 2.2
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Remove all items from the dictionary.
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.. method:: clear()
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.. method:: dict.copy()
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Remove all items from the dictionary.
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Return a shallow copy of the dictionary.
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.. method:: copy()
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.. method:: dict.fromkeys(seq[, value])
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Return a shallow copy of the dictionary.
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Create a new dictionary with keys from *seq* and values set to *value*.
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.. method:: fromkeys(seq[, value])
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:func:`fromkeys` is a class method that returns a new dictionary. *value*
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defaults to ``None``.
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Create a new dictionary with keys from *seq* and values set to *value*.
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.. versionadded:: 2.3
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:func:`fromkeys` is a class method that returns a new dictionary. *value*
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defaults to ``None``.
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.. method:: dict.get(key[, default])
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.. versionadded:: 2.3
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Return the value for *key* if *key* is in the dictionary, else *default*. If
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*default* is not given, it defaults to ``None``, so that this method never
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raises a :exc:`KeyError`.
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.. method:: get(key[, default])
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.. method:: dict.has_key(key)
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Return the value for *key* if *key* is in the dictionary, else *default*.
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If *default* is not given, it defaults to ``None``, so that this method
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never raises a :exc:`KeyError`.
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``d.has_key(key)`` is equivalent to ``key in d``, but deprecated.
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.. method:: has_key(key)
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.. method:: dict.items()
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``dict.has_key(key)`` is equivalent to ``key in d``, but deprecated.
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Return a copy of the dictionary's list of ``(key, value)`` pairs.
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.. method:: items()
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.. note::
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Return a copy of the dictionary's list of ``(key, value)`` pairs.
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Keys and values are listed in an arbitrary order which is non-random, varies
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across Python implementations, and depends on the dictionary's history of
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insertions and deletions. If :meth:`items`, :meth:`keys`, :meth:`values`,
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:meth:`iteritems`, :meth:`iterkeys`, and :meth:`itervalues` are called with no
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intervening modifications to the dictionary, the lists will directly correspond.
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This allows the creation of ``(value, key)`` pairs using :func:`zip`: ``pairs =
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zip(d.values(), d.keys())``. The same relationship holds for the
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:meth:`iterkeys` and :meth:`itervalues` methods: ``pairs = zip(d.itervalues(),
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d.iterkeys())`` provides the same value for ``pairs``. Another way to create the
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same list is ``pairs = [(v, k) for (k, v) in d.iteritems()]``.
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.. note::
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.. method:: dict.iteritems()
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Keys and values are listed in an arbitrary order which is non-random,
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varies across Python implementations, and depends on the dictionary's
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history of insertions and deletions. If :meth:`items`, :meth:`keys`,
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:meth:`values`, :meth:`iteritems`, :meth:`iterkeys`, and
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:meth:`itervalues` are called with no intervening modifications to the
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dictionary, the lists will directly correspond. This allows the
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creation of ``(value, key)`` pairs using :func:`zip`: ``pairs =
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zip(d.values(), d.keys())``. The same relationship holds for the
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:meth:`iterkeys` and :meth:`itervalues` methods: ``pairs =
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zip(d.itervalues(), d.iterkeys())`` provides the same value for
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``pairs``. Another way to create the same list is ``pairs = [(v, k) for
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(k, v) in d.iteritems()]``.
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Return an iterator over the dictionary's ``(key, value)`` pairs.
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See the note for :meth:`dict.items`.
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.. method:: iteritems()
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.. versionadded:: 2.2
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Return an iterator over the dictionary's ``(key, value)`` pairs. See the
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note for :meth:`dict.items`.
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.. method:: dict.iterkeys()
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.. versionadded:: 2.2
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Return an iterator over the dictionary's keys. See the note for
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:meth:`dict.items`.
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.. method:: iterkeys()
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.. versionadded:: 2.2
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Return an iterator over the dictionary's keys. See the note for
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:meth:`dict.items`.
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.. method:: dict.itervalues()
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.. versionadded:: 2.2
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Return an iterator over the dictionary's values. See the note for
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:meth:`dict.items`.
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.. method:: itervalues()
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.. versionadded:: 2.2
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Return an iterator over the dictionary's values. See the note for
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:meth:`dict.items`.
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.. method:: dict.keys()
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.. versionadded:: 2.2
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Return a copy of the dictionary's list of keys. See the note for
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:meth:`dict.items`.
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.. method:: keys()
|
||||
|
||||
.. method:: dict.pop(key[, default])
|
||||
Return a copy of the dictionary's list of keys. See the note for
|
||||
:meth:`dict.items`.
|
||||
|
||||
If *key* is in the dictionary, remove it and return its value, else return
|
||||
*default*. If *default* is not given and *key* is not in the dictionary, a
|
||||
:exc:`KeyError` is raised.
|
||||
.. method:: pop(key[, default])
|
||||
|
||||
.. versionadded:: 2.3
|
||||
If *key* is in the dictionary, remove it and return its value, else return
|
||||
*default*. If *default* is not given and *key* is not in the dictionary,
|
||||
a :exc:`KeyError` is raised.
|
||||
|
||||
.. method:: dict.popitem()
|
||||
.. versionadded:: 2.3
|
||||
|
||||
Remove and return an arbitrary ``(key, value)`` pair from the dictionary.
|
||||
.. method:: popitem()
|
||||
|
||||
:func:`popitem` is useful to destructively iterate over a dictionary, as
|
||||
often used in set algorithms. If the dictionary is empty, calling
|
||||
:func:`popitem` raises a :exc:`KeyError`.
|
||||
Remove and return an arbitrary ``(key, value)`` pair from the dictionary.
|
||||
|
||||
.. method:: dict.setdefault(key[, default])
|
||||
:func:`popitem` is useful to destructively iterate over a dictionary, as
|
||||
often used in set algorithms. If the dictionary is empty, calling
|
||||
:func:`popitem` raises a :exc:`KeyError`.
|
||||
|
||||
If *key* is in the dictionary, return its value. If not, insert *key* with a
|
||||
value of *default* and return *default*. *default* defaults to ``None``.
|
||||
.. method:: setdefault(key[, default])
|
||||
|
||||
.. method:: dict.update([other])
|
||||
If *key* is in the dictionary, return its value. If not, insert *key*
|
||||
with a value of *default* and return *default*. *default* defaults to
|
||||
``None``.
|
||||
|
||||
Update the dictionary with the key/value pairs from *other*, overwriting existing
|
||||
keys. Return ``None``.
|
||||
.. method:: update([other])
|
||||
|
||||
:func:`update` accepts either another dictionary object or an iterable of
|
||||
key/value pairs (as a tuple or other iterable of length two). If keyword
|
||||
arguments are specified, the dictionary is then is updated with those
|
||||
key/value pairs: ``d.update(red=1, blue=2)``.
|
||||
Update the dictionary with the key/value pairs from *other*, overwriting
|
||||
existing keys. Return ``None``.
|
||||
|
||||
.. versionchanged:: 2.4
|
||||
Allowed the argument to be an iterable of key/value pairs and allowed
|
||||
keyword arguments.
|
||||
:func:`update` accepts either another dictionary object or an iterable of
|
||||
key/value pairs (as a tuple or other iterable of length two). If keyword
|
||||
arguments are specified, the dictionary is then is updated with those
|
||||
key/value pairs: ``d.update(red=1, blue=2)``.
|
||||
|
||||
.. method:: dict.values()
|
||||
.. versionchanged:: 2.4
|
||||
Allowed the argument to be an iterable of key/value pairs and allowed
|
||||
keyword arguments.
|
||||
|
||||
Return a copy of the dictionary's list of values. See the note for
|
||||
:meth:`dict.items`.
|
||||
.. method:: values()
|
||||
|
||||
Return a copy of the dictionary's list of values. See the note for
|
||||
:meth:`dict.items`.
|
||||
|
||||
|
||||
.. _bltin-file-objects:
|
||||
|
|
|
|||
Loading…
Reference in New Issue