nptel-DSA-using-Python/Week 4 : Quiz at main · RISHII-BHARADHWAJ/nptel-DSA-using-Python · GitHub

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1) Consider the following Python function.
def mystery(l):
    if l == []:
        return(l)
    else:
        return(mystery(l[1:])+l[:1])
What does mystery([22,14,19,65,82,55]) return?

Ans:- [55, 82, 65, 19, 14, 22]


2) What is the value of pairs after the following assignment?
pairs = [ (x,y) for x in range(4,1,-1) for y in range(5,1,-1) if (x+y)%3 == 0 ]

Ans:- [(4, 5), (4,2), (3, 3), (2, 4)]


3) Consider the following dictionary.
wickets = {"Tests":{"Bumrah":[3,5,2,3],"Shami":[4,4,1,0],"Ashwin":[2,1,7,4]},"ODI":{"Bumrah":[2,0],"Shami":[1,2]}}

Which of the following statements does not generate an error?
 wickets["ODI"]["Ashwin"][0:] = [4,4]
 wickets["ODI"]["Ashwin"].extend([4,4])
 wickets["ODI"]["Ashwin"] = [4,4]
 wickets["ODI"]["Ashwin"] = wickets["ODI"]["Ashwin"] + [4,4]

Ans:-wickets["ODI"]["Ashwin"] = [4,4] (C)


4) Assume that hundreds has been initialized as an empty dictionary:  hundreds = {}

Which of the following generates an error?
 hundreds["Tendulkar, international"] = 100
 hundreds["Tendulkar"] = {"international":100}
 hundreds[("Tendulkar","international")] = 100
 hundreds[["Tendulkar","international"]] = 100

Ans:-  hundreds[["Tendulkar","international"]] = 100 (D)