[Tutor] OOP programming principles overview? [Complex numbers and OOP]

[Kirby Urner]

Interestingly, as of Python 2.2, you can take ordinary integers
and study them as objects:

  >>> dir(3)
  ['__abs__', '__add__', '__and__', '__class__', '__cmp__', '__coerce__',
  '__delattr__', '__div__', '__divmod__', '__float__', '__floordiv__',
  '__getattribute__', '__hash__', '__hex__', '__init__', '__int__',
  '__invert__', '__long__', '__lshift__', '__mod__', '__mul__', '__neg__',
  '__new__', '__nonzero__', '__oct__', '__or__', '__pos__', '__pow__',
  '__radd__', '__rand__', '__rdiv__', '__rdivmod__', '__reduce__',
  '__repr__', '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__',
  '__ror__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__',
  '__rtruediv__', '__rxor__', '__setattr__', '__str__', '__sub__',
  '__truediv__', '__xor__']
  >>> 3 .__add__
  <method-wrapper object at 0x01300FB0>
  >>> 4 .__add__
  <method-wrapper object at 0x013044E0>
  >>> 5 .__add__(6)
  11

Notice you need to add a space after the integer, before the .
-- otherwise the parser wouldn't understand you don't mean
float.

Such as space is legal even in ordinary circumstances:

  >>> class A:
  	 property = 'ddd'

	
  >>> a = A()
  >>> a.property
  'ddd'
  >>> a .property
  'ddd'

Kirby