generate a dependency tree of the inheritance hierarchy

i am trying to write a recursive algorithm to generate a dependency tree of the inheritance hierarchy of a class. Below is my sample code. The problem i am getting is when we the elements in the bases list are more than one, only the 1st element of the list and its parent classes are printed.

def get_bases(klass):
   bases = getattr(klass, '__bases__')
   if len(bases) == 0:
      return None
   else:
      for开发者_如何学编程 item in bases:
        print item
        return  get_bases(item)

I also would like to generate some kind of graph showing the inheritance hierarchy. Kindly help!

The problem is here:

for item in bases:
    print item
    return get_bases(item)

You recurse into the item, and then immediately return without continuing through the for loop. You can replace with something like:

for item in bases:
    print item
    get_bases(item)

or you could perhaps build up a tree structure instead for printing later (pprint_node shows one possible implementation):

class Node(object):
    def __init__(self, item, children):
        self.item = item
        self.children = children

def get_class_tree(klass):
    bases = getattr(klass, '__bases__')
    return Node(klass, [get_class_tree(item) for item in bases])

def pprint_node(node, level=0):
    print ("  "*level) + str(node.item)
    for child in node.children:
        pprint_node(child, level+1)