File Handling (CSV & JSON)

1. Reading and Writing Text Files

Pehle basic text file read aur write ka example dekhte hain:

# Writing to a text file
with open("sample.txt", "w") as f:
    f.write("Hello AIkiPadhai!\n")
    f.write("Python file handling is easy.")

# Reading from a text file
with open("sample.txt", "r") as f:
    content = f.read()
    print(content)

Output:

Hello AIkiPadhai!
Python file handling is easy.

2. Working with CSV Files

csv module ka use structured data handle karne ke liye hota hai.

import csv

# Writing CSV file
with open("students.csv", "w", newline="") as f:
    writer = csv.writer(f)
    writer.writerow(["Name", "Age"])
    writer.writerow(["Rahul", 20])
    writer.writerow(["Priya", 22])

# Reading CSV file
with open("students.csv", "r") as f:
    reader = csv.reader(f)
    for row in reader:
        print(row)

Output:

['Name', 'Age']
['Rahul', '20']
['Priya', '22']

3. Working with JSON Files

JSON format widely used hai APIs aur web development me.

import json

data = {
    "name": "Ravi",
    "age": 25,
    "skills": ["Python", "AI", "ML"]
}

# Writing JSON file
with open("data.json", "w") as f:
    json.dump(data, f)

# Reading JSON file
with open("data.json", "r") as f:
    loaded_data = json.load(f)
    print(loaded_data)

Output:

{'name': 'Ravi', 'age': 25, 'skills': ['Python', 'AI', 'ML']}

Summary

• Text Files: open(), read(), write()
• CSV Files: csv.reader, csv.writer
• JSON Files: json.load, json.dump