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Min head with decrease key functionality (#1202)

* Min head with decrease key functionality

* doctest added

* __str__ changed as per Python convention

* edits in doctest

* get_value by key added

* __getitem__ added
R
Raj committed
6ac7b1387f9b2c2fa428bbe2bd26d3e087e41b23
Parent: e40d4a2
Committed by Christian Clauss <cclauss@me.com> on 9/25/2019, 10:03:31 PM