Python __getattr__ and __setattr__ use method _python

For example, the following examples:

Class Book(Object):
Def __setattr__(Self, Name, Value):
If Name == ' Value ':
Object.__setattr__(Self, Name, Value - 100)
Else:
Object.__setattr__(Self, Name, Value)
Def __getattr__(Self, Name):
Try:
Return Object.__getattribute__(Name)
Except:
return name + ' are not found! '
def __str__(self):
return self. Name + ' cost: ' + str(self. Value)

c = book()
C. Name = ' Python '
C. Value = 100
Print C. Name
Print C. Value
Print C
print c. Type

In the example above, in the Value property of the assignment book, secretly subtracting the value by 100, uh. Output results:

Python
0
Python cost:0
Type is not found!