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

Python Collections: Exercise-32 with Solution

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

Sample Solution:

Python Code:

from collections import defaultdict
classes = (
    ('V', 1),
    ('VI', 1),
    ('V', 2),
    ('VI', 2),
    ('VI', 3),
    ('VII', 1),
)

class_rollno = defaultdict(list)

for class_name, roll_id in classes:
    class_rollno[class_name].append(roll_id)

print(class_rollno)

Sample Output:

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

Flowchart:

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

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Next: Write a Python program to count the number of students of individual class.

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Python: Tips of the Day

Use Enumerate() In for Loops:

>>> students = ('John', 'Mary',  'Mike')
>>> for i, student in enumerate(students):
  ...     print(f'Iteration:  {i}, Student: {student}')
  ... 
Iteration: 0, Student: John
Iteration: 1, Student: Mary
Iteration: 2, Student: Mike
>>> for i, student in enumerate(students,  35001):
  ...      print(f'Student Name: {student}, Student ID #: {i}')
  ... 
Student Name: John, Student ID #: 35001
Student Name: Mary, Student ID #: 35002
Student Name: Mike, Student ID #: 35003