Add explicit cast of iterator to list for python 3 compatibility
Add explicit cast of iterator to list for python 3 compatibility

quantopian/datashape,FrancescAlted/datashape,ContinuumIO/datashape,markflorisson/datashape,FrancescAlted/datashape,blaze/datashape,llllllllll/datashape,cpcloud/datashape,cpcloud/datashape,markflorisson/datashape,aterrel/datashape,aterrel/datashape,quantopian/datashape,ContinuumIO/datashape,cowlicks/datashape,blaze/datashape,llllllllll/datashape,cowlicks/datashape