Brtdku

I'm trying to do this : Initialise child class with instance of parent class.

genomic_feature_instance is instanced and contains what follows :

{'name': 'ENSG00000223972.5', 'type': 'gene', 'iv': , 'source': 'HAVANA',
'score': '.', 'frame': '.', 'attr' : {'ID': 'ENSG00000223972.5',
'gene_id': 'ENSG00000223972.5', 'gene_type':
'transcribed_unprocessed_pseudogene', 'gene_status': 'KNOWN',
'gene_name': 'DDX11L1', 'leve l': '2', 'havana_gene':
'OTTHUMG00000000961.2'}}

I want to create a custom/child instance to manipulate attributes and functions from this class of genomic_feature_instance.

 aCustomGenomicFeature = CustomGenomicFeature(genomic_feature_instance,'kikou')

This is what I have done but I would like to use super() to inherit all attribute values from this genomic_feature (instance of GenomicFeature)

class CustomGenomicFeature(GenomicFeature):



    def __init__(self,genomic_feature_instance,kikou):



        # call parent constructor to set name and color 

        self.genomic_feature = genomic_feature_instance

        # Subclass-specific stuff follows

        self.kikou=kikou

Within the init() method of the CustomGenomicFeature class you can explicitly invoke the init() method of the GenomicFeature class by just calling super().init()

class CustomGenomicFeature(GenomicFeature):



    def __init__(self,genomic_feature,kikou):

        super().__init__(genomic_feature)

        self.kikou=kikou

With __dict__.update

I would rather advice the use of __dict__ instead of super, because super won't help you to copy the value of the attributes of the parent object. So you could do something like that:

class A():

    def __init__(self):

        self.x = 1



class B(A):

    def __init__(self, a):

        super(B, self).__init__()

        self.__dict__.update(a.__dict__)



a = A()

b = B(a)



print(b.x)  # displays '1'



a.x = 3

b2 = B(a)



print(b2.x)  # displays '3'. Without the __dict__update, it would return '1'

That way you set every attribute your parent class has without modifying the attributes of the child class that the parent does not have.

In your case:

class CustomGenomicFeature(GenomicFeature):



    def __init__(self,genomic_feature_instance,kikou):



        self.__dict__.update(genomic_feature_instance.__dict__)



        # Subclass-specific stuff follows

        self.kikou=kikou

With Composition

Another way (and probably more clean), would be to use composition instead of inheritance:

class CustomGenomicFeature(GenomicFeature):



    def __init__(self,genomic_feature_instance,kikou):



        # keep ref to the genomic_feature_instance

        self._genomic_feature = genomic_feature_instance



        # Subclass-specific stuff follows

        self.kikou=kikou



    @property

    def name(self):

        return self._genomic_feature.name

More:

• Inheritance vs. Composition