Enumeration of all defined features¶
- sage.features.all.all_features()[source]¶
- 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')...] - >>> from sage.all import * >>> from sage.features.all import all_features >>> sorted(all_features(), key=lambda f: f.name) # random [...Feature('sage.combinat')...] 
- sage.features.all.module_feature(module_name)[source]¶
- Find a top-level - Featurethat provides the Python module of the given- module_name.- Only features known to - all_features()are considered.- INPUT: - module_name– string
 - OUTPUT: a - Featureor- 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 - >>> from sage.all import * >>> from sage.features.all import module_feature >>> module_feature('sage.combinat.tableau') # needs sage.combinat Feature('sage.combinat') >>> module_feature('sage.combinat.posets.poset') # needs sage.graphs Feature('sage.graphs') >>> module_feature('sage.schemes.toric.variety') # needs sage.geometry.polyhedron Feature('sage.geometry.polyhedron') >>> module_feature('scipy') # needs scipy Feature('scipy') >>> print(module_feature('sage.structure.element')) None >>> print(module_feature('sage.does_not_exist')) None 
- sage.features.all.name_feature(name, toplevel=None)[source]¶
- Find a top-level - Featurethat provides the top-level- name.- Only features known to - all_features()are considered.- INPUT: - name– string
- toplevel– a module or other namespace
 - OUTPUT: a - Featureor- 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 - >>> from sage.all import * >>> from sage.features.all import name_feature >>> name_feature('QuadraticField') # needs sage.rings.number_field Feature('sage.rings.number_field') >>> name_feature('line') # needs sage.plot Feature('sage.plot') >>> print(name_feature('ZZ')) None >>> print(name_feature('does_not_exist')) None