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Read graphs in LEDA format.

LEDA is a C++ class library for efficient data types and algorithms.

Format
------
See http://www.algorithmic-solutions.info/leda_guide/graphs/leda_native_graph_fileformat.html

Ú	read_ledaÚ
parse_ledaé    N)ÚNetworkXError)Ú	open_fileÚrb)ÚmodeúUTF-8c                    s   ‡ fdd„| D ƒ}t |ƒ}|S )a±  Read graph in LEDA format from path.

    Parameters
    ----------
    path : file or string
       File or filename to read.  Filenames ending in .gz or .bz2  will be
       uncompressed.

    Returns
    -------
    G : NetworkX graph

    Examples
    --------
    G=nx.read_leda('file.leda')

    References
    ----------
    .. [1] http://www.algorithmic-solutions.info/leda_guide/graphs/leda_native_graph_fileformat.html
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¡  d¡}|dkrªt|ƒ}|||< q„| d	d„ | ¡ D ƒ¡ tt| ƒƒ}t|ƒD ]~}zt| ƒ ¡ \}}	}
}W n8 tk
�r4 } ztd
|d › �ƒ|‚W 5 d}~X Y nX |j|t|ƒ |t|	ƒ |dd… d� qà|S )a|  Read graph in LEDA format from string or iterable.

    Parameters
    ----------
    lines : string or iterable
       Data in LEDA format.

    Returns
    -------
    G : NetworkX graph

    Examples
    --------
    G=nx.parse_leda(string)

    References
    ----------
    .. [1] http://www.algorithmic-solutions.info/leda_guide/graphs/leda_native_graph_fileformat.html
    Ú
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startswithÚrstripr
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 þzparse_leda.<locals>.<listcomp>é   éÿÿÿÿé   z|{}|  r   c                 S   s   g | ]\}}|‘qS r   r   )r   ÚiÚsr   r   r   r   _   s     z"Too few fields in LEDA.GRAPH edge Né   éþÿÿÿ)Úlabel)Ú
isinstanceÚstrÚiterÚsplitÚrangeÚnextÚintÚnxZDiGraphZGraphr   ÚstripZadd_nodes_fromÚitemsÚBaseExceptionr   Zadd_edge)r   r   Zdur   ÚnÚnodeÚsymbolÚmr   ÚtZreversalr"   Úerrr   r   r   r   0   s:    
þÿ


&*)r   )
Ú__doc__Ú__all__Znetworkxr*   Znetworkx.exceptionr   Znetworkx.utilsr   r   r   r   r   r   r   Ú<module>   s   
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