Q.Consider the following dictionaries, D and D1 : D={"Suman": 40, "Raj":55, "Raman":60} D1={"Aditi":30, "Amit":90,"Raj":20} (Answer using built-in Python functions only)

Concept: Dictionary operations in Python — accessing values, finding length, merging dictionaries, and deleting keys using built-in methods.

Solution:

(i) (a) To retrieve the value for key "Raj" in D, use the indexing operator or the get() method:

print(D["Raj"])

This displays 55.

(i) (b) To find the number of key-value pairs in D1, use the len() function:

print(len(D1))

This displays 3.

(ii) (a) To append all items from D into D1, use the update() method:

D1.update(D)

After this, D1 becomes {"Aditi": 30, "Amit": 90, "Raj": 55, "Suman": 40, "Raman": 60}. Note that "Raj" in D1 is overwritten by the value from D. …

Dictionaries in Python store data as key-value pairs, where each unique key maps to a value. The question tests fundamental dictionary operations that you'll use constantly in programming and data manipulation.

The key insight is that Python provides direct, readable syntax for these operations. You don't need loops or complex logic—the language gives you built-in functions and methods designed specifically for dictionary manipulation.

Let me work through each part:

(i) Accessing and Measuring Dictionaries

(a) Display the value for key "Raj" in D

To retrieve a value from a dictionary, you use square-bracket notation with the key:

print(D["Raj"])

This accesses the value associated with "Raj" in dictionary D, which is 55. The print() function displays it.

Alternatively, you could use the .get() method:

print(D.get("Raj"))

(b) Display the length of D1

The len() function counts the number of key-value pairs:

print(len(D1))

Dictionary D1 has three entries: "Aditi", "Amit", and "Raj", so this returns 3.

(ii) Modifying Dictionaries

(a) Append all key-value pairs from D to D1

The .update() method merges one dictionary into another:

D1.update(D)

This adds all entries from D into D1. If a key already exists in D1 (like "Raj"), its value gets overwritten by the value from D.

After this operation:

D1 = {"Aditi": 30, "Amit": 90, "Raj": 60, "Suman": 40, "Raman": 60}
``` …