CODEWITHSUNDEEP
pythonclassattributes
Flip Pap
Flip Pap

Reputation: 13

How to set as attribute an attribute value from another class in Python

Imagine having a class

class Bracings:  
     def __init__(self,type,axes,matrix):      
         self.type = type  
         self.axes = axes
         self.matrix = matrix

class Element:  
 ...

Then, imagine having

**elm** = *Element*()  
**br** = *Bracings*( 'buckling' , 'y', [1,2,3,4] )

What I want to do is to create an attribute at elm which will be like this 

**elm**.bracing.buckling.y = **br**

the problem is i dont know the attributes names... it could be buckling, it could be lateral_tortional, it could be y, it could be z they take their values from the br object

How would you go about to solve this?

Upvotes: 1

Views: 173

Answers (2)

Angelos Gkaraleas
Angelos Gkaraleas

Reputation: 398

first of all you have to create a new class which will be empty. then you have to set a function at Element like set_bracings: 

class Empty(object):  
    def __init__(self):  
        pass

#then at class Element:
class Element:
....
    def set_bracings(self, bracing):
        case = bracing.case
        axes = bracing.axes

        if hasattr(self,'bracings') == False:
            #Its the first ever bracing which is created
            empty1 = Empty()
            setattr( empty1, axes, bracing)
            empty2 = Empty()
            setattr( empty2, case, empty1)
            setattr( self, 'bracings', empty2)
        else:
           if hasattr(self.bracings,case) == False:
                #if we enter in this check then at some point another attribute of case was created, so we keep it
                brace = self.bracings

                empty1 = Empty()
                setattr( empty1, axes, bracing)
                setattr( brace, case, empty1)
                setattr( self, 'bracings', brace)
            else:
                #If we enter here then we our 'case' is the same as another 'case' that was created earlier so we have to keep it
                brace = self.bracings
                old_axes = getattr(self.bracings , case)
                setattr( old_axes, axes, bracing)
                setattr( brace, case, old_axes)
                setattr( self, 'bracings', brace)

#after that you only have to do
elm.set_bracings( br )

Upvotes: 1

Boaz Galil
Boaz Galil

Reputation: 72

I think that you are trying to explore the inheritance concept. More information in the python documentation

Defining class Element as subclass of Bracing will allow you to access attributes of Bracing from Element.

class Element(Bracing):

Upvotes: 0

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