remove/update many of the references to dict.iter*()
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@ -291,10 +291,10 @@ dictionary's keys::
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Note that the order is essentially random, because it's based on the hash
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ordering of the objects in the dictionary.
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Applying ``iter()`` to a dictionary always loops over the keys, but dictionaries
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have methods that return other iterators. If you want to iterate over keys,
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values, or key/value pairs, you can explicitly call the ``iterkeys()``,
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``itervalues()``, or ``iteritems()`` methods to get an appropriate iterator.
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Applying :func:`iter` to a dictionary always loops over the keys, but
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dictionaries have methods that return other iterators. If you want to iterate
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over values or key/value pairs, you can explicitly call the
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:meth:`values` or :meth:`items` methods to get an appropriate iterator.
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The :func:`dict` constructor can accept an iterator that returns a finite stream
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of ``(key, value)`` tuples::
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@ -414,7 +414,7 @@ can be combined. ::
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# Show a dictionary sorted and grouped by value
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>>> from operator import itemgetter
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>>> d = dict(a=1, b=2, c=1, d=2, e=1, f=2, g=3)
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>>> di = sorted(d.iteritems(), key=itemgetter(1))
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>>> di = sorted(d.items(), key=itemgetter(1))
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>>> for k, g in groupby(di, key=itemgetter(1)):
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... print(k, map(itemgetter(0), g))
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...
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@ -464,9 +464,6 @@ incur interpreter overhead. ::
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"Return function(0), function(1), ..."
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return imap(function, count())
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def iteritems(mapping):
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return izip(mapping.iterkeys(), mapping.itervalues())
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def nth(iterable, n):
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"Returns the nth item or raise StopIteration"
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return islice(iterable, n, None).next()
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@ -1804,39 +1804,24 @@ types should support too):
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.. method:: dict.items()
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Return a copy of the dictionary's list of ``(key, value)`` pairs.
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Return an iterator over the dictionary's ``(key, value)`` pairs.
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.. note::
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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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insertions and deletions. If :meth:`items`, :meth:`keys`, and
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:meth:`values` 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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.. method:: dict.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:: dict.iterkeys()
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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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Return an iterator over the dictionary's values. See the note for
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:meth:`dict.items`.
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same list is ``pairs = [(v, k) for (k, v) in d.items()]``.
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.. method:: dict.keys()
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Return a copy of the dictionary's list of keys. See the note for
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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.pop(key[, default])
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@ -1855,13 +1840,13 @@ types should support too):
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.. method:: dict.setdefault(key[, default])
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If *key* is in the dictionary, return its value. If not, insert *key* with a
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value of *default* and return *default*. *default* defaults to ``None``.
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If *key* is in the dictionary, return its value. If not, insert *key* with
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a value of *default* and return *default*. *default* defaults to ``None``.
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.. method:: dict.update([other])
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Update the dictionary with the key/value pairs from *other*, overwriting existing
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keys. Return ``None``.
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Update the dictionary with the key/value pairs from *other*, overwriting
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existing keys. Return ``None``.
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:func:`update` accepts either another dictionary object or an iterable of
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key/value pairs (as a tuple or other iterable of length two). If keyword
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@ -1870,8 +1855,8 @@ types should support too):
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.. method:: dict.values()
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Return a copy of the dictionary's list of values. See the note for
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:meth:`mapping.items`.
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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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.. _bltin-file-objects:
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@ -33,7 +33,8 @@ The :mod:`UserDict` module defines the :class:`UserDict` class and
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.. note::
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For backward compatibility, instances of :class:`UserDict` are not iterable.
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For backward compatibility, instances of :class:`UserDict` are not
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iterable.
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.. class:: IterableUserDict([initialdata])
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@ -62,8 +63,8 @@ provide the following attribute:
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:meth:`__delitem__` will preclude only :meth:`pop` and :meth:`popitem` from the
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full interface.
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In addition to the four base methods, progressively more efficiency comes with
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defining :meth:`__contains__`, :meth:`__iter__`, and :meth:`iteritems`.
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In addition to the four base methods, progressively more efficiency comes
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with defining :meth:`__contains__` and :meth:`__iter__`.
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Since the mixin has no knowledge of the subclass constructor, it does not define
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:meth:`__init__` or :meth:`copy`.
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@ -93,10 +94,11 @@ The :mod:`UserList` module defines the :class:`UserList` class:
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.. class:: UserList([list])
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Class that simulates a list. The instance's contents are kept in a regular
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list, which is accessible via the :attr:`data` attribute of :class:`UserList`
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list, which is accessible via the :attr:`data` attribute of
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:class:`UserList`
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instances. The instance's contents are initially set to a copy of *list*,
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defaulting to the empty list ``[]``. *list* can be any iterable, e.g. a
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real Python list or a :class:`UserList` object.
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defaulting to the empty list ``[]``. *list* can be any iterable, for
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example a real Python list or a :class:`UserList` object.
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In addition to supporting the methods and operations of mutable sequences (see
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section :ref:`typesseq`), :class:`UserList` instances provide the following
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@ -1589,8 +1589,8 @@ a sequence, the allowable keys should be the integers *k* for which ``0 <= k <
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N`` where *N* is the length of the sequence, or slice objects, which define a
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range of items. It is also recommended that mappings provide the methods
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:meth:`keys`, :meth:`values`, :meth:`items`, :meth:`has_key`, :meth:`get`,
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:meth:`clear`, :meth:`setdefault`, :meth:`iterkeys`, :meth:`itervalues`,
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:meth:`iteritems`, :meth:`pop`, :meth:`popitem`, :meth:`copy`, and
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:meth:`clear`, :meth:`setdefault`,
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:meth:`pop`, :meth:`popitem`, :meth:`copy`, and
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:meth:`update` behaving similar to those for Python's standard dictionary
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objects. The :mod:`UserDict` module provides a :class:`DictMixin` class to help
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create those methods from a base set of :meth:`__getitem__`,
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@ -1608,7 +1608,7 @@ should be equivalent of :meth:`has_key`; for sequences, it should search through
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the values. It is further recommended that both mappings and sequences
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implement the :meth:`__iter__` method to allow efficient iteration through the
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container; for mappings, :meth:`__iter__` should be the same as
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:meth:`iterkeys`; for sequences, it should iterate through the values.
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:meth:`keys`; for sequences, it should iterate through the values.
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.. method:: object.__len__(self)
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@ -1677,7 +1677,7 @@ container; for mappings, :meth:`__iter__` should be the same as
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This method is called when an iterator is required for a container. This method
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should return a new iterator object that can iterate over all the objects in the
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container. For mappings, it should iterate over the keys of the container, and
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should also be made available as the method :meth:`iterkeys`.
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should also be made available as the method :meth:`keys`.
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Iterator objects also need to implement this method; they are required to return
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themselves. For more information on iterator objects, see :ref:`typeiter`.
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