What is the difference between the two classes below? Do you have some related information about this case? Thank you very much.
class test(object):
def __init__(self, name):
print name
class test():
def __init__(self, name):
print name
In python 2.x, the class that inherits from object will be a new-style class, while the other won't, while in python 3.x there'll be both new-style.
However, the differences between new and old are rather advanced, (for example, attribute search order) so a beginner shouldn't be too concerned about the incompatibilities.
See this answer for more information if you're interested, but it's rather a thing for library developers etc.
Mhmm ... this wiki-page explains the differences very illustratively: http://wiki.python.org/moin/NewClassVsClassicClass
And I saw some answeres with the information, that Old-(Classic)-Style and New-Style classes are the same in py3 -> that's not correct:
Old-style classes are removed in Python 3, leaving only the semantics of new-style classes
Besides this, the New-Style classes are quite available since Python 2.2. Up to 2.1 we have had to use the Classic style -> see here
Short summary about the differences/infos could be:
type() built-in massively) But in most way the introduction of the New-style classes has been affected within the comming up of python's Descriptors --> read more here.
In this case, none, because the first explicitly inherits from object as a base class, while the second inherits from object implicitly.
test.__mro__ for the first class. The second class throws an AttributeError.
()is unnecessary, as a matter of fact.