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Computer Science · 2026 · 2 marks
CBSE 2026 · Central · Set 4 · Q24
Assuming that D1 is a dictionary in Python, (i) (a) Write a Python expression to check if the key, 'RNo' is present in D1.
Assuming that D1 is a dictionary in Python,
(i)
(a)
Write a Python expression to check if the key, 'RNo' is present in D1.
OR
(b)
Write a Python expression to check if any key in D1 has a value 12.
(ii)
(a)
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.
OR
(b)
Write a single statement to delete all the elements from D1.
Marking-scheme solution
(i)(a)
'RNo' in D1
OR
'RNo' in D1.keys()(i)(b)
12 in D1.values()(ii)(a)
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(ii)(b)
D1.clear()
OR
D1={}
OR
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CBSE Class 12 Computer Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.