Learn Python

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#ABOUT PYTHON

Python is a popular programming language. It was created by Guido van Rossum, and released in 1991.

#It is used for:

web development (server-side),
software development,
mathematics,
system scripting.

#NOTE: CLICK ON THE IMAGE TO VIEW IT IN HD

#ROAD-MAP OF LEARNING PYTHON

#Before starting roadmap we need to learn two basic stuffs

PYTHON SYNTAX
PYTHON INDENTATION

#PYTHON SYNTAX

U can simply assume syntax as output

Python syntax can be executed by writing directly in the Command Line:

Or by creating a python file on the server, using the .py file extension, and running it in the Command Line:

#Execute Python Syntax

Command Line

Creating a python file on the server

remember the file extension for python is '.py'

#PYTHON INDENTATION

Indentation refers to the spaces at the beginning of a code line.
Where in other programming languages the indentation in code is for readability only, the indentation in Python is very important.
Python uses indentation to indicate a block of code.

NOW WE ARE STARTING OUR ROADMAP

#1.PYTHON STRINGS

#Strings_basics
#Slicing Strings
#Modify Strings
#String Concatenation
#Format - Strings
#Escape Characters
#String Methods

#Strings_basics

GO through the image for better understanding!

#2.FUNCTION

FUNCTIONS:

TAKE AN EXAMPLE: YOU ORDERED A BOOK FROM AMAZON, AMAZON will

1.take a box and specify ur name in the box

2.put the book inside the box

3.close the box, then Delivered to you

SIMILARLY!

1.Open a box by defining any name u want

2.Put ur code inside that box

3.close the function

BASIC EXAMPLE:

EXAMPLE-1

EXAMPLE-2

#WHY WE USE FUNCTION?

CUZ each function u define has its unique output

#lemon juice example!

GO through the image for better understanding!

#3.PYTHON VARIABLES

Variables_basics
Variables names
Assign multiple variables
Output variable
Global variable

1.VARIABLES

Variables are containers for storing data values.
Python has no command for declaring a variable.
A variable is created the moment you first assign a value to it.

#VARIABLES - NAMES

A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume).

#Rules for Python variables:

A variable name must start with a letter or the underscore character
A variable name cannot start with a number
A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
Variable names are case-sensitive (age, Age and AGE are three different variables)

3.ASSIGN MULTIPLE VALUES

Python allows you to assign values to multiple variables in one line:

Note: Make sure the number of variables matches the number of values, or else you will get an error.

#OUTPUT - VARIABLES

The Python print statement is often used to output variables
To combine both text and a variable, Python uses the + character:

#GLOBAL - VARIABLES

Variables that are created outside of a function (as in all of the examples above) are known as global variables.
Global variables can be used by everyone, both inside of functions and outside.