limit scope of try/except
limit scope of try/except

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