# Intro to Programming with Python

**Software**

Software is a set of instructions to the hardware.

**Programming**

Programming means writing the instructions to create a software.

**Code**

The instructions that we write to create software is called **Code**.

**Syntax**

Similar to Grammar rules in English, Hindi, each programming language has a unique set of rules. These rules are called the **Syntax** of a Programming Language.

## Why Python
Python is an easy to learn, powerful programming language. With Python, it is possible to create programs with minimal amount of code. Look at the code in Java and Python used for printing the message **"Hello World"**

**Java:**

class Main {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

**Python:**

print("Hello World")

### Applications of Python

Python is a versatile language which has applications in almost every field

- Artificial intelligence (AI)
- Machine Learning (ML)
- Big Data
- Smart Devices/Internet of Things (IoT)
- Cyber Security
- Game Development
- Backend Development, etc.

### Career Opportunities
Python developers have plenty of opportunities across the world

- DevOps Engineer
- Software Developer
- Data Analyst
- Data Scientist
- Machine Learning (ML) Engineer
- AI Scientist, etc.

## Hello World Program in Python

Here is a simple Python code that you can use to display the message **"Hello World"**

#### Code

print("Hello World!")

#### Output

Hello World! 

### Possible Mistakes

Possible mistakes you may make while writing Python code to display the message "Hello World"

- Spelling Mistake in print

prnt("Hello World!")

- Uppercase ‘P’ in Print

Print("Hello World!")

- Missing quotes

print(Hello World!)

- Missing parentheses

print("Hello World!"

## Printing Without Quotes

If we want to print the numerical result of 2 + 5, we do not add quotes.

#### Code

print(2 + 5) 

#### Output

7 

If we want to print the exact message "2 + 5", then we add the quotes.

#### Code

print("2 + 5") 

#### Output

2 + 5 

## Calculations with python

**Addition**

Addition is denoted by `+` sign.
It gives the sum of two numbers.

#### Code

print(2 + 5) 
print(1 + 1.5) 

#### Output

7 
2.5 

**Subtraction**

Subtraction is denoted by `-` sign.
It gives the difference between two numbers.

#### Code

print(5 - 2) 

#### Output

3

**Multiplication**

Multiplication is denoted by `*` sign.

#### Code

print(2 * 5)
print(5 * 0.5)

#### Output

10
2.5

**Division**

Division is denoted by `/` sign.

#### Code

print(5 / 2)
print(4/2)

#### Output

2.5
2.0