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Python Notes PDF

This document provides comprehensive notes on Python programming, covering topics from basic syntax and data types to advanced concepts like decorators and generators. It includes examples for each topic, such as functions, loops, and file handling, along with an overview of popular libraries like NumPy, Pandas, and Matplotlib. The notes serve as a complete guide for learning Python from the ground up.

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aishwaryatsgowda02
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21 views5 pages

Python Notes PDF

This document provides comprehensive notes on Python programming, covering topics from basic syntax and data types to advanced concepts like decorators and generators. It includes examples for each topic, such as functions, loops, and file handling, along with an overview of popular libraries like NumPy, Pandas, and Matplotlib. The notes serve as a complete guide for learning Python from the ground up.

Uploaded by

aishwaryatsgowda02
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Python Complete Notes (A to Z) with Examples

1. Introduction to Python - Python is an interpreted, high-level, general-purpose programming


language. - Features: Simple, readable, dynamic typing, extensive libraries. - Install: From https://
www.python.org/downloads/ - Run code: Using Python interpreter or IDE (PyCharm, VS Code).

Example:

print("Hello, Python!")

2. Basic Syntax - Variables: store data. - Data types: int, float, str, bool. - Comments: # for single line.

Example:

name = "Alice"
age = 20
print(name, age)

3. Operators - Arithmetic: + , - , * , / , % , ** , // - Assignment: = , += , -= - Comparison:


== , != , > , < , >= , <= - Logical: and , or , not

Example:

x = 10
y = 3
print(x + y, x ** y)
print(x > y and y < 5)

4. Conditional Statements

if x > y:
print("x is greater")
elif x == y:
print("x equals y")
else:
print("y is greater")

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5. Loops

# For loop
for i in range(5):
print(i)

# While loop
count = 0
while count < 5:
print(count)
count += 1

6. Functions

def greet(name):
return f"Hello, {name}!"

print(greet("Alice"))

# Lambda function
square = lambda x: x**2
print(square(5))

7. Data Structures

# List
fruits = ["apple", "banana"]
fruits.append("cherry")

# Tuple
coords = (10, 20)

# Set
unique = {1, 2, 3}
unique.add(4)

# Dictionary
d = {"name": "Alice", "age": 20}
print(d["name"])

8. Strings

2
s = "Hello, World!"
print(s[0:5]) # Slice
print(s.lower())
print(f"Name: {d['name']}")

9. Modules & Packages

import math
print(math.sqrt(16))

from random import randint


print(randint(1, 10))

10. File Handling

# Write file
with open("test.txt", "w") as f:
f.write("Hello Python")

# Read file
with open("test.txt", "r") as f:
print(f.read())

11. Exception Handling

try:
num = int(input("Enter number: "))
except ValueError:
print("Invalid input")
finally:
print("End of program")

12. Object-Oriented Programming

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

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print(f"Hi, I'm {self.name}")

p = Person("Alice", 20)
p.greet()

13. Advanced Topics

# Decorator

def decorator(func):
def wrapper():
print("Before function")
func()
return wrapper

@decorator
def say_hello():
print("Hello")

say_hello()

# Generator
def gen():
for i in range(5):
yield i

for val in gen():


print(val)

14. Popular Libraries Overview

# NumPy
import numpy as np
arr = np.array([1,2,3])
print(arr * 2)

# Pandas
import pandas as pd
df = pd.DataFrame({"A": [1,2], "B": [3,4]})
print(df)

# Matplotlib
import matplotlib.pyplot as plt
plt.plot([1,2,3], [4,5,6])
plt.show()

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End of Python Notes

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