![]() We could have put there Cat or Dog as well. The only way to access the class info _class_info is putting a class name in front. Yet, a problem lurks in the definition of about. A building contains all the details about the floor, rooms, doors. Suppose a class is a prototype of a building. Both files should be located in the same. We will import this file into another file where we want to use the class and its functions. python class Operations: def init(self): self.sum 0 def Tosum(self,a,b): self.sum a+b return self.sum. The class came into existence when it instantiated. First, let us create a new file, Numsum, with a class performing some functions as shown below. Pet.about(), Dog.about() and Cat.about(). We have already discussed in previous tutorial, a class is a virtual entity and can be seen as a blueprint of an object. ![]() Due to this, we are now capable of calling "about" without the necessity of passing an instance as a parameter, i.e. Objects have member variables and have behaviour associated with them. As we have learned previously in our tutorial, a staticmethod does not have a first parameter with a reference to an object. A class is a code template for creating objects. Now, we will define the method about as a "staticmethod" to show the disadvantage of this approach. We will have to write Pet.about(p), Dog.about(d) and Cat.about(c) instead. It would be a lot better, if we could just write Pet.about(), Dog.about() and Cat.about() to get the previous result. We had to create instances of the Pet, Dog and Cat classes to be able to ask what the class is about. On second thought we recognize the awful design. This may look alright at first at first glance. The static method "gcd" is called by our class method "reduce" with "cls.gcd(n1, n2)". the greatest common divisor (gcd) of two or more integers (at least one of which is not zero), is the largest positive integer that divides the numbers without a remainder. We have defined a static gcd function to calculate the greatest common divisor of two numbers. We can reduce a fraction to lowest terms by dividing both the numerator and denominator by the Greatest Common Divisor (GCD). If you work with fractions, you need to be capable of reducing fractions, e.g. The following program contains a fraction class, which is still not complete. You can also call it an abstract data type. This is a problem, if we are in a use case, where we have inherited classes. A class is a blueprint for objects- one class for any number of objects of that type. To do this, we would have to hard code the class name, if we had to use static methods. They are often used, where we have static methods, which have to call other static methods.They are used in the definition of the so-called factory methods, which we will not cover here.
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