[Tutor] Populating a list with object to be called by a class
steve at pearwood.info
Thu Sep 20 21:39:44 CEST 2012
On 21/09/12 02:57, eryksun wrote:
> On Thu, Sep 20, 2012 at 12:25 PM, eryksun<eryksun at gmail.com> wrote:
>> cls._count += 1
> I forgot the obligatory warning about class variables.
Python is not Java. In Python, classes are first-class objects (no pun
intended) and can be assigned to variables the same as any other type.
x = something_that_returns_a_float() # x is a float variable
s = something_that_returns_a_string() # s is a string variable
C = something_that_returns_a_class() # C is a class variable
Preferred terminology is attribute, not variable. Class attributes live
in the class and are shared across all instances. Instance attributes
live in the instance and are not shared.
> The subclass gets a shallow copy of the parent class namespace.
Not so much.
py> class C(object):
... x = 1
py> class D(C): pass
py> D.__dict__ == C.__dict__
py> 'x' in D.__dict__
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