gistfile1.py

class Base(object):
  def __init__(self, x):
    self._hoge = x

  @staticmethod
  def generate(n, x):
    if n == 0:
      return Sub0(x)
    return Sub1(x)

class Sub0(Base):
  def __init__(self, x):
    self._fuga = x

class Sub1(Base):
  def __init__(self, x):
    self._moga = x

print Base(2)
print Base.generate(0, 1)
print Base.generate(1, 2)