PyUMLGraph

PyUMLGraph: "PyUMLGraph is a Python debugger that produces UML diagrams by inspecting running Python programs. The output is in Graphviz's dot language, and dot can produce pictures in many popular formats, such as PNG, PDF, SVG, and others. The UML diagrams can contain information about class inheritance relationships, references to other classes, class methods and return types, as well as class attributes and types."