python - elif command keeps repeating inside while command -

i put elif statement in while statement, , expected when finishes what's inside it, it'd repeat while command. happens console spams "unknown command" indefinitely. how fix this?

while o == 0:     if bla bla bla         o = 1     elif o != 1: #this should happen after takes if commands above me account         print('unknown command') 

whenever o==0 true, elif statement true (o!=1) unless if statement true , o changed 1. when elif statement executed, goes infiniteloop since value of o not changed inside elif. or add break after print in elif