Docstring:
dir([object]) -> list of strings

If called without an argument, return the names in the current scope.
Else, return an alphabetized list of names comprising (some of) the attributes
of the given object, and of attributes reachable from it.
If the object supplies a method named __dir__, it will be used; otherwise
the default dir() logic is used and returns:
 for a module object: the module's attributes.
 for a class object: its attributes, and recursively the attributes
  of its bases.
 for any other object: its attributes, its class's attributes, and
  recursively the attributes of its class's base classes.

class A(object):
  def A_X_1(self):
    pass

  def A_X_2(self):
    pass

  def A_X_3(self):
    pass

  def get_A_X_methods(self):
    return filter(lambda x: x.startswith('A_X') and callable(getattr(self,x)), dir(self))

print A().get_A_X_methods()

> ['A_X_1', 'A_X_2', 'A_X_3']