(self, u, v)
| 1268 | return node in self._node |
| 1269 | |
| 1270 | def has_edge(self, u, v): |
| 1271 | try: |
| 1272 | return v in self._adj[u] |
| 1273 | except KeyError: |
| 1274 | return False |
| 1275 | |
| 1276 | def number_of_nodes(self): |
| 1277 | """Returns the number of nodes. |
no outgoing calls