CODEWITHSUNDEEP
pythonclassobject
user1530405
user1530405

Reputation: 455

Convert python statement to string

I have a class which is instantiated into an object. I would like to be able to generate a string, when I change any of the object's property. The string must contain the objects Name, the property's Name and the value that it changed to:

class Common(object):
    pass

Obj = Common()
Obj.Name = 'MyName'
Obj.Size = 50
print Obj.Size
>50
Obj.Size = 100

I would like to have a string containing "Obj,Size,100" Is this possible ?

Upvotes: 1

Views: 1100

Answers (2)

Nikita
Nikita

Reputation: 6341

Are you looking for special methods, namely __setattr__() to perform actions on attribute change, i.e.:

>>> class Common(object):
...     pass
...     def __setattr__(self, name, value):
...         print("Name: {}, Value: {}".format(name, value))
...         object.__setattr__(self, name, value)
... 
>>> obj=Common()
>>> obj.test=10

Name: test, Value: 10

This way anytime you add some attribute to object it'll be printed. See docs for more information: https://docs.python.org/3.5/reference/datamodel.html

Upvotes: 0

gtlambert
gtlambert

Reputation: 11971

You could use a get_size class method as follows:

class Common(object):

    def get_size(self):
        return "Obj,Size,{}".format(self.size)

obj = Common()
obj.name = 'MyName'
obj.size = 50
print(obj.get_size())

Output

Obj,Size,50

Upvotes: 1

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