Opened 16 months ago

Last modified 14 months ago

#31718 closed enhancement

ManifoldSubset, Manifold: Change some methods to generators — at Initial Version

Reported by: mkoeppe Owned by:
Priority: major Milestone: sage-9.4
Component: manifolds Keywords:
Cc: gh-mjungmath, egourgoulhon, tscrim Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: #31680 Stopgaps:

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This ticket proposes to change some methods that currently return lists to generators - like the method open_supersets added in #31677. This is in line with the changes in the Python standard library when we moved from Python 2 to 3.


  • open_covers() currently returns a list of lists
    • change to generator of FiniteManifoldSubsetFamily instances
  • subsets() currently returns a frozenset
    • change to generator of ManifoldSubset instances


  • top_charts() currently returns a list
    • change to generator of charts
  • coord_changes() currently returns a copy
    • change to generator of pairs ((from, to), map) ... so that dict(M.coord_changes()) will create the copy

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