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some time i see some classes defined as subclass of object class, as
class my_class(object):
pass
how is if different from the simple definition as
class my_class():
pass
630
Copy an Object in Python In Python, we use = operator to create a copy of an object. You may think that this creates a new object; it doesn't. It only creates a new variable that shares the reference of the original object.
Yes, you can use copy. deepcopy . so just c2 = copy.
Copying Arbitrary Python Objects Its copy. copy() and copy. deepcopy() functions can be used to duplicate any object.
Creating a class that inherits from another class To create a class that inherits from another class, after the class name you'll put parentheses and then list any classes that your class inherits from. In a function definition, parentheses after the function name represent arguments that the function accepts.
__dict__ in Python represents a dictionary or any mapping object that is used to store the attributes of the object. They are also known as mappingproxy objects.
This syntax declares a new-style class.
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The first one is a new style class and the second is the old style class.
EDIT
In [1]: class A:
...: pass
...:
In [2]: class B(object):
...: pass
...:
In [3]: a = A()
In [4]: b = B()
In [5]: dir(a)
Out[5]: ['__doc__', '__module__']
In [6]: dir(b)
Out[6]:
['__class__',
'__delattr__',
'__dict__',
'__doc__',
'__format__',
'__getattribute__',
'__hash__',
'__init__',
'__module__',
'__new__',
'__reduce__',
'__reduce_ex__',
'__repr__',
'__setattr__',
'__sizeof__',
'__str__',
'__subclasshook__',
'__weakref__']
For Python 3.x, there is no difference. In Python 2.x, deriving from object makes a class new-style, while providing no base classes will give you an old-style class.
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