Enumeration of all defined features

sage.features.all.all_features()

Return an iterable of all features.

EXAMPLES:

sage: from sage.features.all import all_features
sage: sorted(all_features(), key=lambda f: f.name)  # random
[...Feature('sage.combinat')...]

sage.features.all.module_feature(module_name)

Find a top-level Feature that provides the Python module of the given module_name.

Only features known to all_features() are considered.

INPUT:

• module_name – string

OUTPUT: a Feature or None.

EXAMPLES:

sage: from sage.features.all import module_feature
sage: module_feature('sage.combinat.tableau')                                   # needs sage.combinat
Feature('sage.combinat')
sage: module_feature('sage.combinat.posets.poset')                              # needs sage.graphs
Feature('sage.graphs')
sage: module_feature('sage.schemes.toric.variety')                              # needs sage.geometry.polyhedron
Feature('sage.geometry.polyhedron')
sage: module_feature('scipy')                                                   # needs scipy
Feature('scipy')
sage: print(module_feature('sage.structure.element'))
None
sage: print(module_feature('sage.does_not_exist'))
None

sage.features.all.name_feature(name, toplevel=None)

Find a top-level Feature that provides the top-level name.

Only features known to all_features() are considered.

INPUT:

• name – string

• toplevel – a module or other namespace

OUTPUT: a Feature or None.

EXAMPLES:

sage: from sage.features.all import name_feature
sage: name_feature('QuadraticField')                                            # needs sage.rings.number_field
Feature('sage.rings.number_field')
sage: name_feature('line')                                                      # needs sage.plot
Feature('sage.plot')
sage: print(name_feature('ZZ'))
None
sage: print(name_feature('does_not_exist'))
None