What is Python? Notes home academy

 

Python – Complete Notes

✅ What is Python?

Python is a high-level, interpreted, object-oriented programming language with simple syntax. It is known for its ease of learning, readability, and broad applications in automation, web, data science, AI, and more.

---

📌 Key Features of Python

Feature	Description
Level	High-level
Type	Interpreted, Dynamically typed
Paradigm	Multi-paradigm: OOP, functional, procedural
Memory Management	Automatic (Garbage Collection)
Syntax	Simple and English-like
Use Cases	Web dev, AI, Data Science, Automation, Games
Platform	Cross-platform
Created By	Guido van Rossum in 1991

---

🛠️ Python Syntax Basics

🟢 Hello World Program

python
print("Hello, World!")

🟢 Variables

python
x = 10
name = "Afzal"

🟢 Data Types

python
age = 25             # int
price = 99.99        # float
active = True        # bool
name = "Ali"         # str

🟢 Conditional Statement

python
if age > 18:
    print("Adult")
else:
    print("Minor")

🟢 Loop

python
for i in range(5):
    print(i)

🟢 Function

python
def greet(name):
    return "Hello " + name

print(greet("Afzal"))

🟢 Class

python
class Person:
    def __init__(self, name):
        self.name = name

p = Person("Ali")
print(p.name)

---

📘 Important Points for Exams

• Python files end with .py

• Indentation (tabs/spaces) is used instead of {} blocks

• Dynamically typed: no need to declare variable types

• Used in TCS NQT, Infosys, and banking coding rounds

• Library-rich language (NumPy, Pandas, Tkinter, etc.)

---

🎯 Applications of Python

Domain	Use
Web Development	Flask, Django frameworks
AI/ML	TensorFlow, PyTorch, Scikit-learn
Data Science	Pandas, NumPy, Matplotlib
Automation	Scripting, file handling, bots
Cybersecurity	Ethical hacking tools, malware detection
Games	Using libraries like Pygame

---

❓ MCQs for Exams

1. Who developed Python?
   a) Dennis Ritchie
   b) James Gosling
   c) Guido van Rossum ✅
   d) Bjarne Stroustrup

2. Which of these is a Python framework?
   a) React
   b) Flask ✅
   c) Laravel
   d) Angular

3. Which symbol is used for comments in Python?
   a) //
   b) <!-- -->
   c) # ✅
   d) --

4. Which library is used for data analysis?
   a) Django
   b) NumPy
   c) Pandas ✅
   d) Matplotlib

5. Python is a ______ language.
   a) Compiled
   b) Markup
   c) Interpreted ✅
   d) Assembled

---

🧠 Previous Year Questions (JKSSB, SSC, Bank)

• Q. Python is used for which of the following?
  (a) Data Analysis ✅
  (b) Typing
  (c) Document printing
  (d) Networking only

• Q. Python is ____ typed language.
  (a) Statically
  (b) Dynamically ✅
  (c) Not
  (d) None

---

🧪 Practice Exercise

1. Write a program to find the factorial of a number.

2. Create a list and print all even numbers from it.

3. Make a function that checks if a string is a palindrome.

---

🧾 Summary Chart

Category	Python Details
Developed By	Guido van Rossum
Year	1991
File Extension	.py
Execution	Interpreted (Line by Line)
IDEs	PyCharm, VS Code, Jupyter Notebook
Libraries	NumPy, Pandas, Matplotlib, Django
Domains	AI, ML, Data Science, Web, Automation