fixed first of many pylint refactor messages; added __delitem__ to Model
fixed first of many pylint refactor messages; added __delitem__ to Model

openprocurement/schematics,not-napoleon/schematics,kstrauser/schematics,kaiix/schematics,ee08b397/schematics,kstrauser/schematics,mlyundin/schematics,promptworks/schematics,not-napoleon/schematics,promptworks/schematics,ee08b397/schematics,eatfirst/schematics,NerdWallet/schematics