def get_installed_pypackages():
    return {p.project_name.lower(): p for p in pkg_resources.working_set}
def get_leafs(self):
		if self.lchild == None and self.rchild == None:
			return [self.leaf]
		else:
			return self.lchild.get_leafs()+self.rchild.get_leafs()