浅谈python之新式类

 class New(object): # 显式继承object类
 pass

class Old: 
 pass
  
class Old2():
 pass 

import inspect
class D:
  pass
 
class C(D):
  pass 
 
class B(D):
  pass
 
class A(B, C):
  pass  

print inspect.getmro(A)
# (<class __main__.A at 0x000000000322BB88>, 
# <class __main__.B at 0x000000000322B9A8>, 
# <class __main__.D at 0x000000000322BC48>, 
# <class __main__.C at 0x000000000322B948>)

class D(object):
  pass
 
class C(D):
  pass
 
class B(D):
  pass
 
class A(B, C):
  pass

print inspect.getmro(A)

# (<class '__main__.A'>, 
<class '__main__.B'>, 
<class '__main__.C'>, 
<class '__main__.D'>, 
<type 'object'>) 

 class Student(object):
 __slots__ = ('id', 'name', 'gender')
 def exam(self):
  pass

s1 = Student()
'__dict__' in dir(s1) # False
s1.id = 10001
s1.class = 1 
# AttributeError: 'Student' object has no attribute 'class'

def func():
 pass

s1.exam = func 
# AttributeError: 'Student' object attribute 'f' is read-only

 class New(object):
 pass
 
class Old:
 pass
 
new = New()
old = Old()
print(new)
# <__main__.New object at 0x0000000003262208>
print(old)
# <__main__.Old instance at 0x000000000321C6C8>