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You can simply call the method .networkx_graph();

sage: import networkx as nx
sage: G = graphs.PetersenGraph()             
sage: ng = G.networkx_graph()                
sage: ng
<networkx.classes.graph.Graph object at 0xd3c2f8c>
sage: nx.double_edge_swap(ng)                
1

Incidentally, I didn't know this five minutes ago, so I should tell you how I found out. Lots of functionality in Sage objects lives inside them, in methods. Typically conversion functions are either called ".targettype" or "._targettype_", so I tried

sage: G.netw[HERE I HIT TAB]
      G.networkx_graph

which looked promising. And then typing

sage: G.networkx_graph?

gives the documentation:

Help on method networkx_graph in module sage.graphs.generic_graph:

networkx_graph(self, copy=True) method of sage.graphs.graph.Graph instance
    Creates a new NetworkX graph from the Sage graph.

    INPUT:


    -  ``copy`` - if False, and the underlying
       implementation is a NetworkX graph, then the actual object itself
       is returned.


    EXAMPLES::

        sage: G = graphs.TetrahedralGraph()
        sage: N = G.networkx_graph()
        sage: type(N)
        <class 'networkx.classes.graph.Graph'>

    [etc.]

PS: Okay, to be perfectly honest, I tried it first and only looked at the documentation when I came to write this. But I would've looked at the documentaion if it hadn't worked, I promise! :^)

You can simply call the method .networkx_graph();.networkx_graph():

sage: import networkx as nx
sage: G = graphs.PetersenGraph()             
sage: ng = G.networkx_graph()                
sage: ng
<networkx.classes.graph.Graph object at 0xd3c2f8c>
sage: nx.double_edge_swap(ng)                
1

Incidentally, I didn't know this five minutes ago, so I should tell you how I found out. Lots of functionality in Sage objects lives inside them, in methods. Typically conversion functions are either called ".targettype" or "._targettype_", so I tried

sage: G.netw[HERE I HIT TAB]
      G.networkx_graph

which looked promising. And then typing

sage: G.networkx_graph?

gives the documentation:

Help on method networkx_graph in module sage.graphs.generic_graph:

networkx_graph(self, copy=True) method of sage.graphs.graph.Graph instance
    Creates a new NetworkX graph from the Sage graph.

    INPUT:


    -  ``copy`` - if False, and the underlying
       implementation is a NetworkX graph, then the actual object itself
       is returned.


    EXAMPLES::

        sage: G = graphs.TetrahedralGraph()
        sage: N = G.networkx_graph()
        sage: type(N)
        <class 'networkx.classes.graph.Graph'>

    [etc.]

PS: Okay, to be perfectly honest, I tried it first and only looked at the documentation when I came to write this. But I would've looked at the documentaion if it hadn't worked, I promise! :^)

You can simply call the method .networkx_graph():

sage: import networkx as nx
sage: G = graphs.PetersenGraph()             
sage: ng = G.networkx_graph()                
sage: ng
<networkx.classes.graph.Graph object at 0xd3c2f8c>
sage: nx.double_edge_swap(ng)                
1

Incidentally, I didn't know this five minutes ago, so I should tell you how I found out. Lots of functionality in for Sage objects lives inside them, in methods. Typically conversion functions are either called ".targettype" or "._targettype_", so I tried

sage: G.netw[HERE I HIT TAB]
      G.networkx_graph

which looked promising. And then typing

sage: G.networkx_graph?

gives the documentation:

Help on method networkx_graph in module sage.graphs.generic_graph:

networkx_graph(self, copy=True) method of sage.graphs.graph.Graph instance
    Creates a new NetworkX graph from the Sage graph.

    INPUT:


    -  ``copy`` - if False, and the underlying
       implementation is a NetworkX graph, then the actual object itself
       is returned.


    EXAMPLES::

        sage: G = graphs.TetrahedralGraph()
        sage: N = G.networkx_graph()
        sage: type(N)
        <class 'networkx.classes.graph.Graph'>

    [etc.]

PS: Okay, to be perfectly honest, I tried it first and only looked at the documentation when I came to write this. But I would've looked at the documentaion documentation if it hadn't worked, I promise! :^)

You can simply call the method .networkx_graph():

sage: import networkx as nx
sage: G = graphs.PetersenGraph()             
sage: ng = G.networkx_graph()                
sage: ng
<networkx.classes.graph.Graph object at 0xd3c2f8c>
sage: nx.double_edge_swap(ng)                
1

Incidentally, I didn't know this five minutes ago, so I should tell you how I found out. Lots of functionality for Sage objects lives inside them, in methods. Typically conversion functions are either called ".targettype" or "._targettype_", so I tried

sage: G.netw[HERE I HIT TAB]
      G.networkx_graph

which looked promising. And then typing

sage: G.networkx_graph?

gives the documentation:

Help on method networkx_graph in module sage.graphs.generic_graph:

networkx_graph(self, copy=True) method of sage.graphs.graph.Graph instance
    Creates a new NetworkX graph from the Sage graph.

    INPUT:


    -  ``copy`` - if False, and the underlying
       implementation is a NetworkX graph, then the actual object itself
       is returned.


    EXAMPLES::

        sage: G = graphs.TetrahedralGraph()
        sage: N = G.networkx_graph()
        sage: type(N)
        <class 'networkx.classes.graph.Graph'>

    [etc.]

PS: Okay, to be perfectly honest, I tried it first and only looked at the documentation when I came to write this. But I would've looked at the documentation if it hadn't worked, I promise! :^)

You can simply call the method .networkx_graph():

sage: import networkx as nx
sage: G = graphs.PetersenGraph()             
sage: ng = G.networkx_graph()                
sage: ng
<networkx.classes.graph.Graph object at 0xd3c2f8c>
sage: nx.double_edge_swap(ng)                
1

Incidentally, I didn't know this five minutes ago, so I should tell you how I found out. Lots of functionality for Sage objects lives inside them, in methods. Typically conversion functions are either called ".targettype" or "._targettype_", so I tried

sage: G.netw[HERE I HIT TAB]
      G.networkx_graph

which looked promising. And then typing

sage: G.networkx_graph?

gives the documentation:

  Creates a new NetworkX graph from the Sage graph.

     INPUT:


    -  ``copy``        * "copy" - if False, and the underlying
       underlying implementation is a a
         NetworkX graph, then the actual object itself
       itself is returned.


    EXAMPLES::

       EXAMPLES:

          sage: G = graphs.TetrahedralGraph()
         sage: N = G.networkx_graph()
         sage: type(N)
         <class 'networkx.classes.graph.Graph'>

    [etc.]
      sage: G = graphs.TetrahedralGraph()
          sage: G = Graph(G, implementation='networkx')
          sage: N = G.networkx_graph()
          sage: G._backend._nxg is N
          False

          sage: G = Graph(graphs.TetrahedralGraph(), implementation='networkx')
          sage: N = G.networkx_graph(copy=False)
          sage: G._backend._nxg is N
          True

PS: Okay, to be perfectly honest, I tried it first and only looked at the documentation when I came to write this. But I would've looked at the documentation if it hadn't worked, I promise! :^)