Example for Overridding

[psbasha]

Hi,

Could anybody help me with a sample code for function overidding.

Thanks & Regards
PSB

[bartonc]

Hi,

Could anybody help me with a sample code for function overidding.

Thanks & Regards
PSB

Just like you'd expect:

class SuperClass(object):
    def func1(self):
        print 1234

class SubClass(SuperClass):
    def func1(self):
        print 5678
        SuperClass.func1(self)

sc = SubClass()
sc.func1()

[psbasha]

Just like you'd expect:

class SuperClass(object):
    def func1(self):
        print 1234

class SubClass(SuperClass):
    def func1(self):
        print 5678
        SuperClass.func1(self)

sc = SubClass()
sc.func1()

Hi,

Thanks for the example.

In case of C++ we have a Pointer concept and we can play with Base Class Object and Derived class objects to access the common methods or overriden methods thru thier Objects.Is it possible in Python to get the same functionality by assigning the derive class object to the base class and get access to the methods of the derived classes.As shown in the below example.If possible could you please help me in getting the sample code.

Example in C++ :

class A {
virtual void f() { cout << "Class A" << endl; }
};

class B:public A {
void f(int) { cout << "Class B" << endl; }
};

class C:public B {
void f() { cout << "Class C" << endl; }
};

int main() {
B b; C c;
A* pa1 = &b;
A* pa2 = &c;
// b.f();
pa1->f();
pa2->f();
}
The following is the output of the above example:

Class A
Class C

Regards
PSB

[bvdet]

In this case, BasisTransToGlo bal() is based on Plane3D which is based on object. BasisTransToGlo bal() inhehits all of Plane3d()'s methods. Plane3D() overloaded __repr__ is overridden.

class BasisTransToGlobal(Plane3D):
    
    def __init__(self, vN, vA, vB, vR=Point(0,0,0)):
        self.vN = vN
        self.vA = vA
        self.vB = vB
        self.vR = vR
        # local basis aligned with plane defined
        Plane3D.__init__(self, vN, vA, vB)
        
        if chk_type([vR, ]):
            
            if self.N_len > 0.0:
                
                # Unit vector normal to defined plane, local basis 'Z'
                self.N = self.N_uv
                
                # Unit vector between vN and vA, local basis 'X'
                self.A = self.d0
                
                # Unit cross product vector, local basis 'Y'
                self.B = self.cross_product(self.N, self.A)
                
                # global coordinate vector
                self.R = self.translate(vR.x, vR.y, vR.z) + vN
                
            else:
                Warning("The points are collinear ***INVALID***")
                self.R = None
        else:
            raise TypeError, "Arguments must be <type 'point'>"

    def translate(self, X, Y, Z):
        ....................................................................................
        # global coordinate vector with respect to local basis origin
        return Point(R1.x*M, R1.y*M, R1.z*M)

    def __repr__(self):
        return 'BasisTransToGlobal(Point(%s), Point(%s), Point(%s), Point(%s))' % (self.vN, self.vA, self.vB, self.vR)