Key-value pairs.
✍️ 3 exercises + code challenge in this lessonA dictionary stores data as key: value pairs:
student = {"name": "Sara", "age": 22}
student["name"] or student.get("city", "N/A") (no error if missing).student["city"] = "Lahore"pop("age"), del student["age"]keys(), values(), items()a | b or a.update(b)Dictionaries can be nested to represent complex data, just like JSON.
Mastering Python Dictionaries helps you write clean and reliable Python code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
student = {"name": "Sara", "age": 22, "skills": ["python", "sql"]}
student["city"] = "Lahore"
student["age"] += 1
print(student["name"], "is", student["age"])
print("Country:", student.get("country", "Pakistan"))
for key, value in student.items():
print(f" {key}: {value}")
students = {
"s1": {"name": "Ali", "marks": 81},
"s2": {"name": "Hina", "marks": 94},
}
top = max(students.values(), key=lambda s: s["marks"])
print("Top student:", top["name"])Check what you learned in “Python Dictionaries”.
Read a key without an error when it is missing.
city = person.("city", "Unknown")
Which method loops over key-value pairs?
Add the key "city" with value "Multan" to the dictionary and print the dictionary.
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