Atlas deleting attributeDefs from entityDefs

Hi, the only information i have find about deleting one attribute in an entitydef is to delete the whole entityDefs, and then make it again, but for that you need to delete all the entities.  The thing is i have more than 1 million entities to delete.... is there anyway to delete one attribute in an entitydef ?

p-s: I am using python and the package pyapacheatlas