Practice Top 30 Python Programming Questions on Dictionaries Data Structure

Practice Top 30 Python Programming Questions on Dictionaries Data Structure

Q1. Write a program to create a dictionary.

Input:  
{'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}

Q2. Write a program to access a value from a dictionary using its key.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  
Key: 'age'  

Expected Output:  
Age: 25

Q3. Write a program to add a new key-value pair to a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25}  
Key: 'city', Value: 'New York'  

Expected Output:  
Updated Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}

Q4. Write a program to remove a key-value pair from a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  
Key to remove: 'age'  

Expected Output:  
Updated Dictionary: {'name': 'Alice', 'city': 'New York'}

Q5. Write a program to check if a key exists in a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  
Key to check: 'city'  

Expected Output:  
Key 'city' exists in the dictionary.

Q6. Write a program to get all the keys in a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Keys: ['name', 'age', 'city']

Q7. Write a program to get all the values in a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Values: ['Alice', 25, 'New York']

Q8. Write a program to update the value of an existing key in a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25}  
Key: 'age', New Value: 26  

Expected Output:  
Updated Dictionary: {'name': 'Alice', 'age': 26}

Q9. Write a program to merge two dictionaries.

Input:  
Dictionary 1: {'name': 'Alice', 'age': 25}  
Dictionary 2: {'city': 'New York', 'job': 'Engineer'}  

Expected Output:  
Merged Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York', 'job': 'Engineer'}

Q10. Write a program to get the length (number of items) of a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Length of Dictionary: 3

Q11. Write a program to create a dictionary with default values.

Input:  
Dictionary: {'name': 'Alice', 'age': 25}  
Key: 'city', Default Value: 'Unknown'  

Expected Output:  
City: Unknown

Q12. Write a program to create a nested dictionary.

Input:  
Dictionary: {'name': 'Alice', 'address': {'city': 'New York', 'zipcode': '10001'}}  

Expected Output:  
Nested Dictionary: {'name': 'Alice', 'address': {'city': 'New York', 'zipcode': '10001'}}

Q13. Write a program to iterate through a dictionary and print its keys and values.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Key: name, Value: Alice
Key: age, Value: 25
Key: city, Value: New York

Q14. Write a program to create a dictionary where a key maps to multiple values (use a list).

Input:  
Dictionary: {'fruits': ['apple', 'banana', 'cherry']}  

Expected Output:  
Dictionary: {'fruits': ['apple', 'banana', 'cherry']}

Q15. Write a program to find the maximum value in a dictionary.

Input:  
Dictionary: {'a': 10, 'b': 20, 'c': 15}  

Expected Output:  
Maximum Value: 20

Q16. Write a program to find the minimum value in a dictionary.

Input:  
Dictionary: {'a': 10, 'b': 20, 'c': 15}  

Expected Output:  
Minimum Value: 10

Q17. Write a program to get the key with the maximum value.

Input:  
Dictionary: {'a': 10, 'b': 20, 'c': 15}  

Expected Output:  
Key with Maximum Value: b

Q18. Write a program to get the key with the minimum value.

Input:  
Dictionary: {'a': 10, 'b': 20, 'c': 5}  

Expected Output:  
Key with Minimum Value: c

Q19. Write a program to check if a value exists in a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  
Value to check: 'Alice'  

Expected Output:  
Value 'Alice' exists in the dictionary.

Q20. Write a program to remove all items from a dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Dictionary after clear: {}

Q21. Write a program to create a dictionary from a list of tuples.

Input:  
List of tuples: [('name', 'Alice'), ('age', 25), ('city', 'New York')]  

Expected Output:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}

Q22. Write a program to convert a dictionary into a list of tuples.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
List of Tuples: [('name', 'Alice'), ('age', 25), ('city', 'New York')]

Q23. Write a program to check if a dictionary is empty.

Input:  
Dictionary: {}  

Expected Output:  
The dictionary is empty.

Q24. Write a program to reverse a dictionary (swap keys and values).

Input:  
Dictionary: {'name': 'Alice', 'age': 25}  

Expected Output:  
Reversed Dictionary: {'Alice': 'name', 25: 'age'}

Q25. Write a program to sort a dictionary by its keys.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Sorted Dictionary by Keys: {'age': 25, 'city': 'New York', 'name': 'Alice'}

Q26. Write a program to sort a dictionary by its values.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Sorted Dictionary by Values: {'age': 25, 'name': 'Alice', 'city': 'New York'}

Q27. Write a program to find the sum of all values in a dictionary where values are numeric.

Input:  
Dictionary: {'a': 10, 'b': 20, 'c': 30}  

Expected Output:  
Sum of Values: 60

Q28. Write a program to create a dictionary using the fromkeys() method, where all values are initialized to the same value.

Input:  
Keys: ['name', 'age', 'city']  
Value: 'Unknown'  

Expected Output:  
Dictionary: {'name': 'Unknown', 'age': 'Unknown', 'city': 'Unknown'}

Q29. Write a program to copy a dictionary to another dictionary.

Input:  
Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}  

Expected Output:  
Copied Dictionary: {'name': 'Alice', 'age': 25, 'city': 'New York'}

Q30. Write a program to get the key-value pair with the maximum value from a dictionary.

Input:  
Dictionary: {'a': 10, 'b': 20, 'c': 30}  

Expected Output:  
Item with Maximum Value: ('c', 30)