PCAP Certification Exam Preparation by Daccache Georgio

Author:Daccache, Georgio
Language: eng
Format: epub, pdf
Published: 2019-07-24T00:00:00+00:00

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39. Explain about the Overriding method in Python.

The ability of a class to change the implementation of a method provided by one of its ancestors is overriding. This feature is very important in Object-oriented programming like Python as it makes inheritance to get exploited to the fullest potential. Overriding may copy a class without duplicating the code. This feature enhances or customizes a part of the code. Overriding is certainly an integral part of the inheritance. Inheritance is a very powerful method in OOP. It works through implicit delegation.

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40. Which methods of Python are used to determine the type of instance and inheritance?

There are two built-in functions that work with inheritance in Python.

1. isinstance() – this method checks the type of instance.

2. issubclass() – this method checks class inheritance

Issubclass(unicode, str) – returns False because “unicode” is not a subclass of “str”.

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41. What are the two built-in functions which come on the keyboard by default to read a line of text from standard input?

The built-in functions to read a line of text from standard input, which comes from the keyboard by default are:

Raw_input and input

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42. How is Python executed?

The files in Python are compiled in bytecode and then executed by the host. Alternatively, type python.pv at the command line.

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43. What is namespace in Python? What are local and global namespaces?

In Python, every name introduces has a place where resides can be found. This space is known as a namespace. The namespace is an address location, where variable name and object are mapped. When you search a variable, the address location also gets searched, to get a corresponding object.

Local namespaces are created within a function when that function is called.

When a program starts, then global namespaces are created.

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44. How to find undefined g++ symbols __builtin_new or __pure_virtual?

You can load g++ extension modules dynamically. You have to:

Recompile and re-link using g++ in Python(change LINKCC in the python Modules Makefile)

Link the extension module using g++

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