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name : _pbag.cpython-39.pyc
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    A persistent bag/multiset type.

    Requires elements to be hashable, and allows duplicates, but has no
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    Do not instantiate directly, instead use the factory functions :py:func:`b`
    or :py:func:`pbag` to create an instance.

    Some examples:

    >>> s = pbag([1, 2, 3, 1])
    >>> s2 = s.add(4)
    >>> s3 = s2.remove(1)
    >>> s
    pbag([1, 1, 2, 3])
    >>> s2
    pbag([1, 1, 2, 3, 4])
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        Add an element to the bag.

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        pbag([1, 1])
        >>> s3
        pbag([1, 2])
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�add&szPBag.addcCs|rttt||j��S|S)z�
        Update bag with all elements in iterable.

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        Remove an element from the bag.

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        Return the number of times an element appears.


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        Return the length including duplicates.

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        Return an iterator of all elements, including duplicates.

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        Check if an element is in the bag.

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        Check if two bags are equivalent, honoring the number of duplicates,
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        Combine elements from two PBags.

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zPBag.__add__cCsjt|t�stS|j��}|j��D]:\}}|�|�|}|dkrJ|||<q"||vr"|�|�q"t|���S)z�
        Remove elements from one PBag that are present in another.

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zPBag.__sub__cCsTt|t�stS|j��}|j��D]$\}}|�|�}t||�}|||<q"t|���S)z�
        Union: Keep elements that are present in either of two PBags.

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�__or__�s




zPBag.__or__cCsXt|t�stSt���}|j��D](\}}t||�|��}|dkr"|||<q"t|�	��S)z�
        Intersection: Only keep elements that are present in both PBags.

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zPBag.__and__cCs
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        Hash based on value of elements.

        >>> m = pmap({pbag([1, 2]): "it's here!"})
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    Construct a persistent bag.

    Takes an arbitrary number of arguments to insert into the new persistent
    bag.

    >>> b(1, 2, 3, 2)
    pbag([1, 2, 2, 3])
    )�pbag��elementsrrr
�b�s
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    Convert an iterable to a persistent bag.

    Takes an iterable with elements to insert.

    >>> pbag([1, 2, 3, 2])
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