Python

1️⃣ What is Python?

Python is a high-level programming language used to tell the computer what to do.

✔ Easy to read
✔ Easy to write
✔ Used by beginners and professionals

Real-life use:

Software development

Websites (Google, Instagram)

Data analysis

Artificial Intelligence

Automation

2️⃣ Why Python is Easy to Learn

Python looks almost like English.

Example:

print("Hello World")

This means → display “Hello World” on the screen

No special symbols, no complicated rules.

3️⃣ Installing Python (Basic Idea)

Download Python from python.org

Install it

Use:

VS Code

IDLE

Command Prompt

(You already use VS Code 👍)

4️⃣ Your First Python Program

print(“Welcome to Python”)
Explanation:
print → built-in function

“Welcome to Python” → text (string)

Output will be:

Welcome to Python

5️⃣ Variables (Storing Data)

A variable stores a value.

name = “Rajan” age = 20

Explanation:

• name → variable name
• "Rajan" → value
• = → assignment operator

6️⃣ Data Types in Python

Python automatically understands data type.

Data Type	Example
int	10, 25
float	10.5
str	“Hello”
bool	True / False

Example:

price = 99.50

7️⃣ Input from User

name = input(“Enter your name: “)
print(name)
Explanation:
input() → takes data from user

Stores it in name

8️⃣ Operators

Used to perform operations.

Arithmetic Operators

a = 10
b = 5
print(a + b)

Operator	Meaning
+	Addition
–	Subtraction
*	Multiplication
/	Division

9️⃣ Conditional Statements (Decision Making)

Python checks conditions using if / else.

age = 18

if age >= 18:
    print("Eligible to vote")
else:
    print("Not eligible")

Explanation:

• if checks condition
• else runs when condition is false

🔟 Loops (Repeat Work)

For Loop

for i in range(1, 6):
    print(i)

Output:

1
2
3
4
5

While Loop

i = 1
while i <= 5:
    print(i)
    i += 1

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Functions

A function is a block of reusable code.

def greet():
    print("Hello Python")

greet()

Python Keywords

hese are reserved words — cannot be used as variable names.

Some important ones:

if, else, for, while, break, continue,
True, False, None,
def, return, class, import

Summary

Python is simple
✔ Easy to understand
✔ Powerful language
✔ Best for beginners