[issue35911] add a cell construtor, and expose the cell type in Lib/types.py

[Pierre Glaser]

Change by Pierre Glaser <pierreglaser at msn.com>:


Added file: https://bugs.python.org/file48106/test_cell.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35911>
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