tosscall

Q: What will be the output of the following Python code?

>>> a={1,2,3}
>>> a.intersection_update({2,3,4,5})
>>> a

A. {2,3}

B. Error, duplicate item present in list

C. Error, no method called intersection_update for set data type

D. {1,4,5}

Solution: The method intersection_update returns a set which is an intersection of both the sets.

Q: What will be the output of the following Python code?

>>> a={1,2,3}
>>> b=a
>>> b.remove(3)
>>> a

A. {1,2,3}

B. Error, copying of sets isn’t allowed

C. {1,2}

D. Error, invalid syntax for remove

Solution: Any change made in b is reflected in a because b is an alias of a.

Q: What will be the output of the following Python code?

>>> a={1,2,3}
>>> b=a.copy()
>>> b.add(4)
>>> a

A. {1,2,3}

B. Error, invalid syntax for add

C. {1,2,3,4}

D. Error, copying of sets isn’t allowed

Solution: In the above piece of code, b is barely a copy and not an alias of a. Hence any change made in b isn’t reflected in a.

Q: What will be the output of the following Python code?

>>> a={1,2,3}
>>> b=a.add(4)
>>> b

A. 0

B. {1,2,3,4}

C. {1,2,3}

D. Nothing is printed

Solution: The method add returns nothing, hence nothing is printed.

Q: What will be the output of the following Python code?

>>> a={1,2,3}
>>> b=frozenset([3,4,5])
>>> a-b

A. {1,2}

B. Error as difference between a set and frozenset can’t be found out

C. Error as unsupported operand type for set data type

D. frozenset({1,2})

Solution: operator gives the set of elements in set a but not in set b.

Q: What will be the output of the following Python code?

>>> a={5,6,7}
>>> sum(a,5)

A. 5

B. 23

C. 18

D. Invalid syntax for sum method, too many arguments

Solution: The second parameter is the start value for the sum of elements in set a. Thus, sum(a,5) = 5+(5+6+7)=23.

Q: What will be the output of the following Python code?

>>> a={1,2,3}
>>> {x*2 for x in a|{4,5}}

A. {2,4,6}

B. Error, set comprehensions aren’t allowed

C. {8, 2, 10, 4, 6}

D. {8,10}

Solution: Set comprehensions are allowed.

Q: What will be the output of the following Python code?

>>> a={5,6,7,8}
>>> b={7,8,9,10}
>>> len(a+b)

A. 8

B. Error, unsupported operand ‘+’ for sets

C. 6

D. Nothing is displayed

Solution: Duplicate elements in a+b is eliminated and the length of a+b is computed.

Q: What will be the output of the following Python code?

a={1,2,3}
b={1,2,3}
c=a.issubset(b)
print(c)

A. True

B. Error, no method called issubset() exists

C. Syntax error for issubset() method

D. False

Solution: The method issubset() returns True if b is a proper subset of a.

Q: Is the following Python code valid?

a={1,2,3}
b={1,2,3,4}
c=a.issuperset(b)
print(c)

A. False

B. True

C. Syntax error for issuperset() method

D. Error, no method called issuperset() exists

Solution: The method issubset() returns True if b is a proper subset of a.

Test Number 52/108