Fix missing import of 'operator'
Fix missing import of 'operator'

brianv0/sqlalchemy,robin900/sqlalchemy,monetate/sqlalchemy,inspirehep/sqlalchemy,elelianghh/sqlalchemy,davidfraser/sqlalchemy,halfcrazy/sqlalchemy,WinterNis/sqlalchemy,davidfraser/sqlalchemy,Cito/sqlalchemy,robin900/sqlalchemy,EvaSDK/sqlalchemy,inspirehep/sqlalchemy,bootandy/sqlalchemy,alex/sqlalchemy,hsum/sqlalchemy,sandan/sqlalchemy,wujuguang/sqlalchemy,wfxiang08/sqlalchemy,bdupharm/sqlalchemy,WinterNis/sqlalchemy,itkovian/sqlalchemy,brianv0/sqlalchemy,pdufour/sqlalchemy,276361270/sqlalchemy,graingert/sqlalchemy,hsum/sqlalchemy,epa/sqlalchemy,Akrog/sqlalchemy,Cito/sqlalchemy,zzzeek/sqlalchemy,alex/sqlalchemy,ThiefMaster/sqlalchemy,276361270/sqlalchemy,halfcrazy/sqlalchemy,Cito/sqlalchemy,davidjb/sqlalchemy,dstufft/sqlalchemy,davidjb/sqlalchemy,graingert/sqlalchemy,j5int/sqlalchemy,dstufft/sqlalchemy,j5int/sqlalchemy,EvaSDK/sqlalchemy,olemis/sqlalchemy,olemis/sqlalchemy,pdufour/sqlalchemy,alex/sqlalchemy,sandan/sqlalchemy,sqlalchemy/sqlalchemy,Akrog/sqlalchemy,itkovian/sqlalchemy,epa/sqlalchemy,elelianghh/sqlalchemy,monetate/sqlalchemy,ThiefMaster/sqlalchemy,bootandy/sqlalchemy,bdupharm/sqlalchemy,wujuguang/sqlalchemy,wfxiang08/sqlalchemy