🐍 Python Dictionaries for Beginners

🐍 What is a Dictionary?

A dictionary is a collection of data stored in key-value pairs. It is used to store information in an organized way.

Creating a Dictionary

student = {
    "name":"Roshni",
    "age":18,
    "course":"BCA"
}

print(student)

🔑 Accessing Dictionary Values

Values can be accessed using their keys.

student = {
"name":"Roshni",
"age":18
}

print(student["name"])

➕ Adding and Updating Data

student = {
"name":"Roshni"
}

student["age"] = 18

print(student)

➖ Removing Dictionary Items

student = {
"name":"Roshni",
"age":18
}

student.pop("age")

print(student)

✨ Dictionary Methods

• keys() - Returns all keys
• values() - Returns all values
• items() - Returns key-value pairs
• get() - Access value safely
• update() - Update dictionary

🔄 Loop Through Dictionary

student = {
"name":"Roshni",
"age":18
}

for key,value in student.items():
    print(key,value)

🚀 Practice Example

mobile = {
"brand":"OnePlus",
"model":"Nord",
"year":2022
}

print(mobile["brand"])

❓ Frequently Asked Questions

1. What is a dictionary in Python?

A dictionary stores data using key-value pairs.

2. Are dictionaries ordered?

Yes, modern Python dictionaries maintain insertion order.

3. Can dictionary values be changed?

Yes, dictionaries are mutable and values can be updated.