Greg Landrum 46a0af898d Support context managers for mol Suppliers and Writers (#3704) ...

* Add context managers for writers
Allow calling close() on already closed Writers
Fixes #2217

* add a close method to MolSuppliers

* modernize the way we handle presence/absence of MAEPARSER support

* add context managers to suppliers

* changes in response to review

* some cleanup

* more cleanup

2021-01-11 05:52:57 +01:00

2.6 KiB

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