Adding/removing instance members

[Ladvánszky Károly]

I understand instance members can be added to an object in a dynamic manner:

class Cc:
  pass

oCc=Cc()
oCc.x=10    # oCc now has a new member

What is the way to remove these instance members?
Is it possible to add a new member whose name is given by a string?

Thanks on any help,

Károly