Python notes

References to Class

class aclass:

def __init__(self):

self.val = 'avalue'

aaa = aclass() bbb = aclass()

Is it possible to put some code inside the aclass to determine is it 'aaa' or 'bbb' that this class is bound to ???

> pan

Not really, because Python variables don't actually have values: they are object references. So there isn't necessarily a one-to-one relationship between a variable and the object it points to. For example:

>>> class aclass:
 def __init__(self):
  self.val = 'value'

>>> aaa = aclass()
>>> bbb = aaa
>>> ccc = bbb

These three variables all point to the exact same object:

>>> print aaa
<__main__.aclass instance at 0x00A9E678>
>>> print bbb
<__main__.aclass instance at 0x00A9E678>
>>> print ccc
<__main__.aclass instance at 0x00A9E678>

And modifying one changes all three:

>>> aaa.x = 5
>>> print bbb.x
5
>>> print ccc.x
5

The underlying aclass instance doesn't map to a single variable, so it doesn't make much sense to consider it bound to one particular variable.