New submission from Pierre Glaser <pierregla...@msn.com>:
cell objects are containers for the free variables of functions defined in a local scope. They are located in a function's __closure__ attribute (when it is not None). A cell is a very simple object, with a single (optional, e.g the cell can be empty) attribute: cell_contents. The C/Python API provides a constructor to create such objects (PyCell_New). However no cell.__new__ method is exposed to the pure python user. Workarounds exist, but are hacky, and involve the creation of intermediate, unused functions. Why would cell-creation be useful? because creating cells happens in pickle extensions modules designed to save user-defined functions and classes (https://github.com/cloudpipe/cloudpickle) (*). These moudules are dependencies of many widely-used data science frameworks (pyspark, ray, dask). Exposing a cell constructor will simplify theses extensions code base, and alleviate their maintenance cost. I propose to add and expose a simple cell constructor, that accepts 0 (empty cells) or 1 arguments. I also propose to expose the cell type in Lib/types.py (as types.CellType) (*): see related issues: https://bugs.python.org/issue35900 ---------- files: cell.patch keywords: patch messages: 334924 nosy: pierreglaser, pitrou, yselivanov priority: normal severity: normal status: open title: add a cell construtor, and expose the cell type in Lib/types.py type: enhancement versions: Python 3.8 Added file: https://bugs.python.org/file48105/cell.patch _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35911> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
