Draw trees or graph using python from a relationship table

Is there a way to draw a tree structure or graph using python from some relationship(parent/child) table? The child may have more than one parent. For example, |Parent |Child |none |node 1 |none |node 2 |node 1 |node 3 |node 2 |node 3 |node 2 |node 4 This gives node1 node2 / node3 node4