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e f d � � YZ d S( s� Classes to represent arbitrary sets (including sets of sets).
This module implements sets using dictionaries whose values are
ignored. The usual operations (union, intersection, deletion, etc.)
are provided as both methods and operators.
Important: sets are not sequences! While they support 'x in s',
'len(s)', and 'for x in s', none of those operations are unique for
sequences; for example, mappings support all three as well. The
characteristic operation for sequences is subscripting with small
integers: s[i], for i in range(len(s)). Sets don't support
subscripting at all. Also, sequences allow multiple occurrences and
their elements have a definite order; sets on the other hand don't
record multiple occurrences and don't remember the order of element
insertion (which is why they don't support s[i]).
The following classes are provided:
BaseSet -- All the operations common to both mutable and immutable
sets. This is an abstract class, not meant to be directly
instantiated.
Set -- Mutable sets, subclass of BaseSet; not hashable.
ImmutableSet -- Immutable sets, subclass of BaseSet; hashable.
An iterable argument is mandatory to create an ImmutableSet.
_TemporarilyImmutableSet -- A wrapper around a Set, hashable,
giving the same hash value as the immutable set equivalent
would have. Do not use this class directly.
Only hashable objects can be added to a Set. In particular, you cannot
really add a Set as an element to another Set; if you try, what is
actually added is an ImmutableSet built from it (it compares equal to
the one you tried adding).
When you ask if `x in y' where x is a Set and y is a Set or
ImmutableSet, x is wrapped into a _TemporarilyImmutableSet z, and
what's tested is actually `z in y'.
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t | j � S( s' Return the number of elements of a set.( t lenR ( R ( ( s /usr/lib64/python2.7/sets.pyt __len__Q s c C s
| j � S( se Return string representation of a set.
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isinstanceR R t False( R R ( ( s /usr/lib64/python2.7/sets.pyt __eq__� s c C s' t | t � r | j | j k St Sd S( N( R R R t True( R R ( ( s /usr/lib64/python2.7/sets.pyt __ne__� s c C s# | j � } | j j | j � | S( s Return a shallow copy of a set.( R R t update( R t result( ( s /usr/lib64/python2.7/sets.pyt copy� s c C sc d d l m } | j � } | | t | � <| j } t } x! | D] } | | | | | � <qB W| S( s1 Return a deep copy of a set; used by copy module.i����( t deepcopy( R R R t idR R ( R t memoR R t datat valuet elt( ( s /usr/lib64/python2.7/sets.pyt __deepcopy__� s
c C s t | t � s t S| j | � S( sh Return the union of two sets as a new set.
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( R R t NotImplementedt union( R R ( ( s /usr/lib64/python2.7/sets.pyt __or__� s c C s | j | � } | j | � | S( sh Return the union of two sets as a new set.
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c C s t | t � s t S| j | � S( sn Return the intersection of two sets as a new set.
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c C s | j | � d S( s9 Add all values from an iterable (such as a list or file).N( R* ( R RJ ( ( s /usr/lib64/python2.7/sets.pyR � s c C s | j j � d S( s" Remove all elements from this set.N( R R^ ( R ( ( s /usr/lib64/python2.7/sets.pyR^ � s c C s] y t | j | <WnE t k
rX t | d d � } | d k rE � n t | j | � <n Xd S( s` Add an element to a set.
This has no effect if the element is already present.
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