Old Classes Versus New Classes Still Matters In 3.0
@ 2009-01-05 21:38:37
Filed under: Code Tech Python
I was reading a book outlining Python 3.0 changes and I noticed all the classes he made looked like Old Style classes to me. So I had to take a look for myself to see if there was still a difference. Though it looks like much less than it use to ... but there is at least a difference in name still ...
Here is the output from runs on 2.5 and 3.0.
If your writing new code for 2.x or 3.x please use New Style classes!
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Filed under: Code Tech Python
I was reading a book outlining Python 3.0 changes and I noticed all the classes he made looked like Old Style classes to me. So I had to take a look for myself to see if there was still a difference. Though it looks like much less than it use to ... but there is at least a difference in name still ...
import platform
class OldStyle:
"""
An old style class. Boo!
"""
def __init__(self):
"""
Create a Old Style class and prints info about itself.
"""
print("%s\n\tType: %s" % (self.__class__.__name__, type(self)))
print("\tStructure: %s" % dir(self))
class NewStyle(object):
"""
An new style class. Use this!
"""
def __init__(self):
"""
Create a New Style class and prints info about itself.
"""
print("%s\n\tType: %s" % (self.__class__.__name__, type(self)))
print("\tStructure: %s" % dir(self))
if __name__ == '__main__':
print("Python Version: %s" % platform.python_version())
OldStyle()
NewStyle()
Here is the output from runs on 2.5 and 3.0.
[steve@powerhouse ~]$ python objects.py
Python Version: 2.5.2
OldStyle
Type: <type 'instance'>
Structure: ['__doc__', '__init__', '__module__']
NewStyle
Type: <class '__main__.NewStyle'>
Structure: ['__class__', '__delattr__', '__dict__', '__doc__',
'__getattribute__', '__hash__', '__init__', '__module__', '__new__',
'__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__str__', '__weakref__']
[steve@powerhouse ~]$ /opt/python3/bin/python3.0 objects.py
Python Version: 3.0.0
OldStyle
Type: <class '__main__.OldStyle'>
Structure: ['__class__', '__delattr__', '__dict__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__',
'__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__',
'__subclasshook__', '__weakref__']
NewStyle
Type: <class '__main__.NewStyle'>
Structure: ['__class__', '__delattr__', '__dict__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__',
'__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__',
'__subclasshook__', '__weakref__']
If your writing new code for 2.x or 3.x please use New Style classes!
digg it
seed it
del.icio.us
ma.gnolia
Log in to post comments.
