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c C sR | | j k r t d � � n | j j | � t � | j | <t � | j | <d S( s' Add a new vertex to the graph.
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c C sv | j j | � x. | j j | � D] } | j | j | � q# Wx. | j j | � D] } | j | j | � qT Wd S( sL Remove a vertex from the graph, disconnecting all edges from/to it.
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c C s$ | | j | k o# | | j | k S( N( R R ( R R R ( ( sO /opt/alt/python37/lib/python3.7/site-packages/pip/_vendor/resolvelib/structs.pyt connected. s c C sJ | | j k r t | � � n | j | j | � | j | j | � d S( sg Connect two existing vertices.
Nothing happens if the vertices are already connected.
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