Hanks Gideon - Python Programming For Beginners: A step-by-Step Guide to Coding Using Python 3 for Beginners to Pro

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Python Programming

For Beginners

A step-by-Step Guide to Coding Using Python 3 for Beginners to Pro

Gideon Hanks

Copyright

All rights reserved. No part of this book may be reproduced or used in any manner without the prior written permission of the copyright owner, except for the use of brief quotations in a book review.

While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.

Printed on acid-free paper.

Printed in the United States of America

2020 by Gideon Hanks

TABLE OF CONTENTS

CHAPTER 1

Introduction to python

The programming language python is a robust programming language that is interpreted, advanced high-level general-purpose language. Which was created by a developer named Guido van Rossium. The program was first introduced in 1991 and the design stressed on code readability with its usage of white space. Python language constructs and object orient-oriented approach aim more to help developers visible, clear and logical code for small and large scale project and also enterprise.

Python program is able be read by a parser. Its major benefit is that it was designed to be a highly readable language.

Python is an object oriented programming language that helps to develop real life portable application programs.

In working with electronic devices, several or different applications are mostly in use and they are mostly developed by using different languages which the computer understands, such as C, C++, C#.

The application developed by C, C++ do not support cross platform portability. However, python is platform independence. The code reusability feature of python makes software developers to upgrade the existing applications without going to rewrite all the code of the application.

Simple program on Python;

def hello ()

print ( Hello, world! )

Python source byte file extension is .py. or in advance type of .py.c

PROGRAMMING LOGIC AND TECHNIQUES

INPUT, PROCESS, AND OUTPUT

You may notice that some computer machines used in some strategic places like restaurants, shops, airline reservation counters and other various locations. At any time in this places, someone puts in a value and the computer brings out an output, which either shows on the computer screen or its being printed out on hard copy materials. To understand what happens when you key in values in the computer, this phase is called an input phase. The input values are then processed to determine the particular values; this phase is called the process phase. Immediately the process is complete, the result is either shown or displayed on a monitor or screen. This phase is well known as output phase.

PROGRAMS

Programs are a set of instructions to perform a particular job or events. For each event to be done or perform a separate program is performed. Which means to solve some real life problems, someone has to have a number of programs which sum up to form an application.

Computers are generally designed to accept and inputs, process the input and display output. Nevertheless, it has to be provided with set of instructions that states;

• The various kind of inputs will be provided
• The various kind of outputs to be expected.
• The various processing or processes to be done.

Most times we use programs to

• To create pay checks
• To display or print associated reports.

HOW LOGIC OF PROGRAMS WITH CONDITIONS ARE REPRESENTED

VARIABLES AND CONSTANTS

On a normal condition the computer system has an internal memory of various sizes. This internal memory is used to store input provided by an individual or the various users, instructions to process the input, and the outcome output values. The internal memory always consists of different locations in which data is stored. After these instructions are executed, the value of the first number is accepted and stored in memory and this occurs with other value at the same time of input and stored in another location in the memory.

Variable values are mNum1, mNum2, etc

Constant values do not change and they are assigned to a variable.

For example,

mNum1 = 15

where mNum1 is the variable,

constant is figure 15.

DATA TYPES

At times we need to enter a non-numeric data such as names and addresses of things or person. A memory space will be required in the computer to store the different data types of values.

The major data types are;

• Numeric
• Character

• Numeric datatypes : These are variables that can only contain numbers like persons age, commodity prices. It is usually used in arithmetic operations.
• Character datatypes : These are variable that usually contain combination of numbers, letters, and special characters. It is usually implemented in persons or things address and also name of persons or things. On a more important note, it cannot be used for calculation even if they contain only numbers.
• Declaring variables : When allocating values to memory in a program, it is very essential someone declares the variable, therefore the datatype of the variable is identified on the type of data to be stored in it.

For example,

int mNum1 = 2.

Char mNum2.

NAMING VARIABLES

There are various guidelines in naming variables which are;

• The beginning letter of the variable always or may indicate the datatype used. For example, we make use of N or Char to signify a character or numeric as in Char Name, Nphone.
• The name of the variable must clearly describe its purpose. For example, Nresult is a numeric variable to store the score result.
• Another form is when the variable name is multiple words, each first letter of the word could be capitalized for readability. For example;

MTotalResult.

USING OPERATORS

Operators are predefined operations and tools in computer programming language.

They are;

• Arithmetic operators
• Relational operators
• Logical operators.

• Arithmetic operators :

These operators are usually used for performing arithmetic calculations I the computer system.

The commonly used arithmetic operators are;

Multiplication *

Division/

Addition+

Subtraction-

Modulus%

Note that the modulus operator returns the remainder value when one number is divided by another number.

• Relational operators :

These operators usually test the relationship between variables and also test the relationship between constant and variable.

Relational operators are;

=Equal to

> Greater than

!=Not equal to

>=Greater than or equal to

<=Less than equal to

• Logical operators :

These operators help to combine expressions containing relational operators.

Logical operators are;

AND

OR

NOT

Relational operators are AND, if operator evaluates to true only all the individual conditions evaluate to true.

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