CBSE 2026 · Central · Set 4 · Q24 · 2 marks

Assuming that D1 is a dictionary in Python,

(i)

(a)OR(b)

Write a Python expression to check if the key, 'RNo' is present in D1.

(ii)

(a)OR(b)

Write a single statement using a BUILT_IN function to add the key : value pair 'RNo' : $\displaystyle 12$, if the key 'RNo'is not present in D1. However, if the key 'RNo' is present, the function should return its value.

'RNo' in D1
     OR
'RNo' in D1.keys()

12 in D1.values()

D1.setdefault('RNo',12)
    OR
if D1.get('RNo'):
   print(D1['RNo']) # return D1['RNo']
else:
   D1['RNo']=12
    OR
Any other correct equivalent statement

D1.clear()
    OR
D1={}
    OR
D1=dict()

CBSE Class 12 Computer Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.