🚀 Day 72/150 – Dictionary Key-Value Iteration in Python

Dictionaries are one of Python's most useful data structures. They store data as key-value pairs, making it easy to organize and retrieve information efficiently.

In this post, we'll explore different ways to iterate through a dictionary and access its keys and values.

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🔹 Method 1 – Iterate Through Keys

student = {
    "name": "John",
    "age": 20,
    "course": "Python"
}

for key in student:
    print(key)








✅ Output

name
age
course

📌 By default, iterating over a dictionary returns its keys.

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🔹 Method 2 – Using items()

student = {
    "name": "John",
    "age": 20,
    "course": "Python"
}

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

✅ Output

name : John
age : 20
course : Python

📌 items() returns both keys and values together as pairs.

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🔹 Method 3 – Using keys() and values()

student = {
    "name": "John",
    "age": 20,
    "course": "Python"
}

print("Keys:")
for key in student.keys():
    print(key)

print("Values:")
for value in student.values():
    print(value)












✅ Output

Keys:
name
age
course

Values:
John
20
Python

📌 Use keys() when you need only keys and values() when you need only values.

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🔹 Method 4 – Iterating Through Another Dictionary

data = {
    "city": "Delhi",
    "country": "India"
}

for key, value in data.items():
    print(f"{key} : {value}")

✅ Output

city : Delhi
country : India

📌 Works with any dictionary regardless of its size or contents.

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🎯 Why Dictionary Iteration Matters

Dictionary iteration is commonly used for:

✔ Processing API responses

✔ Working with JSON data

✔ Handling user information

✔ Data analysis and reporting

✔ Configuration settings

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🔥 Key Takeaways

✅ Dictionaries store data in key-value pairs.

✅ for key in dictionary loops through keys.

✅ items() returns both keys and values.

✅ keys() returns only keys.

✅ values() returns only values.

✅ Dictionary iteration is a fundamental Python skill.