Python Examples

Introduction Examples

Hello World Program

print("Hello, World!")

Simple Calculation

result = 2 + 3
print(result)  # Output: 5

Basics Examples

Variables and Data Types

x = 5
y = 3.14
name = "Python"
is_fun = True
print(type(x))  # 

Operators

a = 10
b = 3
print(a + b)  # 13
print(a // b)  # 3
print(a == b)  # False

Control Structures

if x > 0:
    print("Positive")
for i in range(3):
    print(i)  # 0, 1, 2

Functions

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

Intermediate Examples

Lists

my_list = [1, 2, 3]
my_list.append(4)
print(my_list)  # [1, 2, 3, 4]

Tuples

my_tuple = (1, 2, 3)
print(my_tuple[0])  # 1

Dictionaries

my_dict = {'name': 'Python', 'year': 1991}
print(my_dict['name'])  # Python

File Handling

with open('hello.txt', 'w') as f:
    f.write('Hello, World!')
with open('hello.txt', 'r') as f:
    print(f.read())  # Hello, World!

Modules

import math
print(math.sqrt(16))  # 4.0

Advanced Examples

OOP

class Dog:
    def __init__(self, name):
        self.name = name
    
    def bark(self):
        return f"{self.name} says woof!"

dog = Dog("Buddy")
print(dog.bark())  # Buddy says woof!

Exceptions

try:
    x = 1 / 0
except ZeroDivisionError:
    print("Cannot divide by zero")

Algorithms

def bubble_sort(arr):
    n = len(arr)
    for i in range(n):
        for j in range(0, n-i-1):
            if arr[j] > arr[j+1]:
                arr[j], arr[j+1] = arr[j+1], arr[j]
    return arr

print(bubble_sort([64, 34, 25, 12, 22]))  # [12, 22, 25, 34, 64]

Data Analysis

import numpy as np
import pandas as pd

# NumPy
arr = np.array([1, 2, 3])
print(arr * 2)  # [2 4 6]

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