Python: Find the class wise roll number from a tuple-of-tuples

Last update on April 21 2025 12:55:52 (UTC/GMT +8 hours)

32. Find Class Wise Roll Number from a Tuple-of-Tuples

Write a Python program to find the class wise roll number from a tuple-of-tuples.

Sample Solution:

Python Code:

# Import the defaultdict class from the collections module
from collections import defaultdict

# Create a tuple 'classes' containing class names and roll numbers
classes = (
    ('V', 1),
    ('VI', 1),
    ('V', 2),
    ('VI', 2),
    ('VI', 3),
    ('VII', 1),
)

# Create a defaultdict 'class_rollno' to store lists of roll numbers for each class
class_rollno = defaultdict(list)

# Loop through the tuples in 'classes'
for class_name, roll_id in classes:
    # Append the roll number 'roll_id' to the list associated with class 'class_name' in 'class_rollno'
    class_rollno[class_name].append(roll_id)

# Print the resulting dictionary 'class_rollno'
print(class_rollno)

Sample Output:

defaultdict(<class 'list'>, {'V': [1, 2], 'VI': [1, 2, 3], 'VII': [1]})

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to group roll numbers by class from a tuple of tuples using collections.defaultdict.
Write a Python program to iterate over a tuple of tuples and construct a dictionary where each key is a class and its value is a list of roll numbers.
Write a Python program to use list comprehension to transform a tuple-of-tuples into a dictionary grouping student roll numbers by class.
Write a Python program to implement a function that returns a grouped dictionary from a tuple-of-tuples containing class and roll numbers.

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