Python Basics: A Self-Teaching Introduction by H. Bhasin

Author:H. Bhasin [Bhasin, H.]
Language: eng
Format: azw3, epub, pdf
Publisher: Mercury Learning and Information
Published: 2018-12-04T16:00:00+00:00

12.2_INIT_ REVISITED

The _init_ function has already been explained in Chapter 10 of this book. The function initializes the members of a class. Those of you from a C++ or Java background will find it hard to ignore the similarity between the constructors (which have the same name as that of the class in C++, etc.) and the _init_ function. Earlier it was stated that _init_ cannot be overloaded, which is partly true. Though one cannot have two _init_ functions in the same class, there is a way to implement constructor overloading as explained in the following discussion.

As stated earlier the purpose of _init_ is to initialize the members of the class. In the following example (Illustration 12.1), a class called complex has two members: real and imaginary, which are initialized by the parameters of the _init_ function. Note that the members of the class are denoted by self.real and self.imaginary and the parameters of the functions are initialized by real and imaginary. The example has a function called putData to display the values of the members. In the _main_() function, c1 is an instance of the class complex. The object c1 is initialized by 5 and 3 and the putData() of the class has been invoked to display the 'Complex Number'.

Illustration 12.1: Create a class called complex, having two members - real and imaginary. The class should have _init_, which takes two parameters to initialize the values of real and imaginary respectively and a function called putData to display the complex number. Create an instance of the complex number in the _main_() function, initialize it by (5, 3) and display the number by invoking the putData function.

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