Class inheritance graphs¶

sage.misc.classgraph.
class_graph
(top, depth=5, name_filter=None, classes=None, as_graph=True)¶ Returns the class inheritance graph of a module, class, or object
INPUT:
top
– the module, class, or object to start with (e.g.sage
,Integer
,3
)depth
– maximal recursion depth within submodules (default: 5)name_filter
– e.g. ‘sage.rings’ to only consider classes insage.rings
classes
– optional dictionary to be filled in (it is also returned)as_graph
– a boolean (default: True)
OUTPUT:
 An oriented graph, with class names as vertices, and an edge from each class to each of its bases.
EXAMPLES:
We construct the inheritance graph of the classes within a given module:
sage: from sage.rings.polynomial.padics import polynomial_padic_capped_relative_dense, polynomial_padic_flat sage: G = class_graph(sage.rings.polynomial.padics); G Digraph on 6 vertices sage: G.vertices() ['Polynomial', 'Polynomial_generic_cdv', 'Polynomial_generic_dense', 'Polynomial_padic', 'Polynomial_padic_capped_relative_dense', 'Polynomial_padic_flat'] sage: G.edges(labels=False) [('Polynomial_padic', 'Polynomial'), ('Polynomial_padic_capped_relative_dense', 'Polynomial_generic_cdv'), ('Polynomial_padic_capped_relative_dense', 'Polynomial_padic'), ('Polynomial_padic_flat', 'Polynomial_generic_dense'), ('Polynomial_padic_flat', 'Polynomial_padic')]
We construct the inheritance graph of a given class:
sage: class_graph(Parent).edges(labels=False) [('CategoryObject', 'SageObject'), ('Parent', 'CategoryObject'), ('SageObject', 'object')]
We construct the inheritance graph of the class of an object:
sage: class_graph([1,2,3]).edges(labels=False) [('list', 'object')]
Warning
the output of
class_graph
used to be a dictionary mapping each class name to the list of names of its bases. This can be emulated by setting the optionas_graph
toFalse
:sage: class_graph(sage.rings.polynomial.padics, depth=2, as_graph=False) {'Polynomial_padic': ['Polynomial'], 'Polynomial_padic_capped_relative_dense': ['Polynomial_generic_cdv', 'Polynomial_padic'], 'Polynomial_padic_flat': ['Polynomial_generic_dense', 'Polynomial_padic']}
Note
the
classes
andas_graph
options are mostly intended for internal recursive use.Note
class_graph
does not yet handle nested classes