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Python Programming – Class
A class is the particular object type created by executing a class statement. Class objects are used as templates to create instance objects, which embodies the attributes: the “data attributes” and “methods”, specific to a data type. A class definition is given below:
classdef : := " class " classname [ inheritance ] " : " suite inheritance : := " ( " [ expression_list ] " ) " classname : := identifier
The above class definition might seem alien, it will become more clear with the progress of this Chapter. The simplest form of class definition looks like:
class ClassName: <statement-1> . . . <statement-N>
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The following example gives a glimpse of how a class is defined.
>>> class Output : . . . def Display ( self ) : . . . print ' This is a class example . ' . . . >>> x=Output ( ) >>> x . Display ( ) This is a class example.
Like function definition (def statements), the class definition (Output in the above example) must be executed before they have any effect. In practice, the statements inside a class definition will usually be function (or more specifically “method”) definitions (Display ( ) in the above example), but other statements are allowed. The function definitions inside a class normally have a peculiar form of the argument list, dictated by the calling conventions for methods (discussed later).
The creation of a class definition also creates a new namespace, and used as the local scope, thus all assignments to local variables go into this new namespace.