/prog/ - equality of objects [python]

Name: Anonymous 2011-01-13 14:13

If we have a classes, that have the same interface and can be used only in the same way, then aren't they the same classes?

If we have objects, that have the same state and have the same interface, then aren't they the same objects?

Look:

class X:

    def foo(self):

        return 1



class Y:

    def foo(self):

        return 1



a = X()

b = Y()

c = Y()

print X == Y

print a == b

print b == c

False

False

False

Name: Anonymous 2011-01-13 14:35

ONE WORD: THE FORCED DIVERSIFICATION OF OBJECTS. THREAD OVER

Name: Anonymous 2011-01-13 14:38

Did you declare anything a property?
Moreover, you aren't comparing class equivalency.

Name: Anonymous 2011-01-13 14:45

>>3
Then how classes should/may be compared?

Name: Anonymous 2011-01-13 14:47

>>4
fuuuuuuuuuuuuuuuuckkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk yoooooooooooooooooouuuuuuuuuuuuuuuuuuuuuu niiiiiiiiiiiiiiiiggggggggggggggggggggggggggggggggggggggggggerrrrrrrrrrrrrrrr!!!!!!!!!!!!!!!!!!!!!!!!!!!

Name: Anonymous 2011-01-13 14:51

>>4
c'mon, if you can't do something in C++ doesn't mean that it can't be done elsewhere

Name: Anonymous 2011-01-13 14:52

Class objects in garbage collected environments generally have reference semantics when it comes to equality by default.

You can override the default behavior to give your objects value semantics for equality comparison. This is done with string objects in python, for example.

Name: Anonymous 2011-01-13 14:59

Thanks dude.

Name: Anonymous 2011-01-13 15:04

I'm going to do groceries.

Name: Anonymous 2011-01-13 15:11

>>9
Don't come back now, y'hear?

Name: Anonymous 2011-01-13 15:46

>>10
I'm back. Bought one baguette, a box of apple juice, and an energy drink.

Name: Anonymous 2011-01-13 16:01

>>11
all staples

Name: Anonymous 2011-01-13 16:32

You are testing if the symbols are pointing to the same object, create an __eq__(self, other) function in both of the classes to overload the == operator.

Name: Anonymous 2011-01-13 16:43

>>12
I rarely buy baguettes. I buy energy drinks only after a sleepless night, which happens every month or two. Only the apple juice is a staple for me.

Name: Anonymous 2011-01-13 17:05

>>14
I, meanwhile, have lived on a diet of pure office supplies for two and a half years now.

Name: Anonymous 2011-01-13 17:45

>>15
I live off synatic sugar

equality of objects [python]

1 Name: Anonymous 2011-01-13 14:13

2 Name: Anonymous 2011-01-13 14:35

3 Name: Anonymous 2011-01-13 14:38

4 Name: Anonymous 2011-01-13 14:45

5 Name: Anonymous 2011-01-13 14:47

6 Name: Anonymous 2011-01-13 14:51

7 Name: Anonymous 2011-01-13 14:52

8 Name: Anonymous 2011-01-13 14:59

9 Name: Anonymous 2011-01-13 15:04

10 Name: Anonymous 2011-01-13 15:11

11 Name: Anonymous 2011-01-13 15:46

12 Name: Anonymous 2011-01-13 16:01

13 Name: Anonymous 2011-01-13 16:32

14 Name: Anonymous 2011-01-13 16:43

15 Name: Anonymous 2011-01-13 17:05

16 Name: Anonymous 2011-01-13 17:45