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c C s t �dS )zAdd an element.N)�NotImplementedError)r. r: r r r! �add: s zMutableSet.addc C s t �dS )z8Remove an element. Do not raise an exception if absent.N)ry )r. r: r r r! �discard? s zMutableSet.discardc C s || krt |��| j|� dS )z5Remove an element. If not a member, raise a KeyError.N)�KeyErrorr{ )r. r: r r r! �removeD s zMutableSet.removec C s< t | �}y t|�}W n tk
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Supporting start and stop arguments is optional, but
recommended.
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XXX Should add all their methods.
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dd� ZdS )r c C s t �d S )N)r� )r. r� r: r r r! r� � s zMutableSequence.__setitem__c C s t �d S )N)r� )r. r� r r r! r� � s zMutableSequence.__delitem__c C s t �dS )z3S.insert(index, value) -- insert value before indexN)r� )r. r� r: r r r! �insert� s zMutableSequence.insertc C s | j t| �|� dS )z:S.append(value) -- append value to the end of the sequenceN)r� rT )r. r: r r r! �append� s zMutableSequence.appendc C s, yx | j � qW W n tk
r& Y nX dS )z,S.clear() -> None -- remove all items from SN)r� r� )r. r r r! r� � s
zMutableSequence.clearc C sL t | �}x>t|d �D ].}| || d | | | |< | || d < qW dS )z!S.reverse() -- reverse *IN PLACE*ri r N)rT r� )r. rq r� r r r! �reverse� s zMutableSequence.reversec C s x|D ]}| j |� qW dS )zMS.extend(iterable) -- extend sequence by appending elements from the iterableN)r� )r. r� r� r r r! �extend� s
zMutableSequence.extendr c C s | | }| |= |S )z�S.pop([index]) -> item -- remove and return item at index (default last).
Raise IndexError if list is empty or index is out of range.
r )r. r� r� r r r! r� � s zMutableSequence.popc C s | | j |�= dS )zvS.remove(value) -- remove first occurrence of value.
Raise ValueError if the value is not present.
N)r� )r. r: r r r! r} � s zMutableSequence.removec C s | j |� | S )N)r� )r. r� r r r! �__iadd__� s
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