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Elmer Gary - 2021 Beginners Guide to Python Programming Language: A Crash Course to Mastering Python in One Hour

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2021 Beginners Guide to Python Programming Language: A Crash Course to Mastering Python in One Hour
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Elmer Gary
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2021 Beginners Guide to

Python Programming Language

A Crash Course to Mastering Python Programming Language in One Hour

Gary Elmer

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 Gary Elmer

Table of Contents

CHAPTER ONE

INTRODUCTION TO PYTHON

You are probably wondering How do I learn Python easily? Well, look no more, help is here. The main goal of this book is to take you from being an absolute beginner to a pro in coding in Python 3. Python gives a simple and straightforward approach thereby making it an impeccable programming language. The Python interface gives you an avenue to go on coding adventures as you get instant feedback on your ideas with the interactive mode.

Whatever your reason for venturing into programming is, whether building games or user interface, Python can give it all to you in simple steps and even short codes. Since Programming is all about making your computer follow your instructions and bringing your ideas to reality, then with Python. Even if you are not new to programming and have learnt other languages before, you are likely going to need Python to step up your coding game.

Throughout this book, I will walk you through writing codes with Python in simple and fun steps. I will be dishing out ideas and skills you will need as a beginner and walk you through the terms and basics you need to know about coding. In order to get the most out of this book, you need to be willing to learn. Take notes and write the lessons out in your journal, this helps in retaining knowledge for a longer time and helps the lesson stick. Consistency is the key to being an expert programmer so I recommend that you ensure you code every day.

Python techniques discussed in this book are concise so if you are interested in learning more about any of the concepts discussed you can progress to advanced textbooks. The first two chapters introduce you to Python, its features and rudiments. Going further, we explore how to write programs and implement them, the various sets used and writing. The last chapter discusses useful tips while writing programs. Furthermore, errors and bugs that might occur during coding are also discussed.

To get started you need to install Python. Go to www.python.org to download the latest version and install. Some computers come with the program pre-installed while some dont. If you use a Mac or Linux, find out if its installed on it and ensure it is the latest version, if its not you would need to upgrade to the latest version. Now that youve installed Python on your PC, lets start the journey of programming.

PROGRAMMING LOGIC AND TECHNIQUES

When we talk about programming logic and techniques, we are referring to the instructions in a program arranged in an order so as to solve a problem. While working on a problem, different program logic can be developed as a solution, what matters most is that the logic works for the problem and the given task is performed. In programming, you have to be conversant with the characters used in giving instructions in order to perform a given task. These characters include:

Variable
Constant
Keywords
Data types
Identifiers
Repetition/Loops
Decisions/Selections
Arrays

INPUT, PROCESS AND OUTPUT (IPO)

In programming, data processing has a laid out structure or model that it follows while a specific task is being carried out. This model is known as the IPO. Basically, data fed into a computer through the keyboard, touchscreen or scanner is known as the input . Data in its raw form is of lesser value until it is processed and output is generated. Process is the activity carried out on the input which converts it into something meaningful. Output is the result of the processed input and it can be in the form of pictures, documents, audios and in programming, output is usually the execution of the task for which a program as written and processed. So in Python, the input is the written code or instruction while output is the task performed.

PROGRAMS

A program is a set of commands in the form of codes written to instruct a computer to execute a given task. Codes are embedded in a program so they are written as the input and processed as instructions to perform a specific task. An example of program is

Z = X + Y,

The mathematical expression given above is an example of a program where X, Y and Z are variables. When we instruct the computer to calculate the value of X and Y, the result which is Z is the output.

HOW LOGIC OF PROGRAMS WITH CONDITIONS ARE REPRESENTED

When conditions are introduced into a program, the output of the program will be according to the condition introduced. In Python, there are true or false values you can use as conditions on the program.

The if condition contains a set of codes which only runs when the condition embedded in the code is true. If the condition is not met and the code is false, else code with a different set of instructions run. So if code is used when a condition is met (true) while else is used when the condition is false and the if condition is not met. The elif condition simply gives an option to try another condition if previous conditions are not true. An example is:

a = 350; b=56

if b > a :

print (a is greater than a)

elif a == b :

print (a and b are equal)

else :

print (a is greater than b)

VARIABLES AND CONSTANTS

When codes are written, values need to be stored in a memory bank where they can be retrieved, these memory banks are known as variables and constants. Variables are datasets that can be changed while constants values remain unchanged throughout a programs execution. A constant value is usually named and assigned initial values while the variable value can be assigned in the process of program execution.

DATA TYPES

In python, each dataset given belongs to a category which shows the kind of tasks a program can be expected to implement on the dataset, this category is known as the data type. The standard types of data in Python are:

Numeric
Sequence type
Boolean
Set
Dictionary

NAMING VARIABLES

In one of the previous sections, we defined variables as values that can be modified in a program. When you change the values of variables in Python, you need to follow certain guidelines so you do not create a wrong code that will not deliver the required output. Python has specific variable naming guidelines:

Variable naming is case sensitive. For example, uppercase letter O can be mistaken for number zero thereby causing confusion in the code so you have to be careful when using letters like this or avoid them when writing codes.
Keep variable names short and clear. Do not just use a letter to represent a certain word as the program can be interpreted as something as, e.g. do not use p for pillow to avoid confusion.

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