Engineering Questions with Answers - Multiple Choice Questions
Python MCQs
1 - Question
1. Is the following Python code valid?
>>> a,b,c=1,2,3 >>> a,b,c
a) Yes, [1,2,3] is printed
b) No, invalid syntax
c) Yes, (1,2,3) is printed
d) 1 is printed
View Answer
Answer: c
Explanation: A tuple needn’t be enclosed in parenthesis.
2 - Question
2. What will be the output of the following Python code?
a = ('check',) n = 2 for i in range(int(n)): a = (a,) print(a)
a) Error, tuples are immutable
b)
(('check',),)
((('check',),),)
c) ((‘check’,)’check’,)
d)
(('check',)’check’,)
((('check',)’check’,)’check’,)
View Answer
Answer: b
Explanation: The loop runs two times and each time the loop runs an extra parenthesis along with a comma is added to the tuple (as a=(a’)).
3 - Question
3. Is the following Python code valid?
>>> a,b=1,2,3
a) Yes, this is an example of tuple unpacking. a=1 and b=2
b) Yes, this is an example of tuple unpacking. a=(1,2) and b=3
c) No, too many values to unpack
d) Yes, this is an example of tuple unpacking. a=1 and b=(2,3)
View Answer
Answer: c
Explanation: For unpacking to happen, the number of values of the right hand side must be equal to the number of variables on the left hand side.
4 - Question
4. What will be the output of the following Python code?
>>> a=(1,2) >>> b=(3,4) >>> c=a+b >>> c
a) (4,6)
b) (1,2,3,4)
c) Error as tuples are immutable
d) None
View Answer
Answer: b
Explanation: In the above piece of code, the values of the tuples aren’t being changed. Both the tuples are simply concatenated.
5 - Question
5. What will be the output of the following Python code?
>>> a,b=6,7 >>> a,b=b,a >>> a,b
a) (6,7)
b) Invalid syntax
c) (7,6)
d) Nothing is printed
View Answer
Answer: c
Explanation: The above piece of code illustrates the unpacking of variables.
6 - Question
6. What will be the output of the following Python code?
>>> import collections >>> a=collections.namedtuple('a',['i','j']) >>> obj=a(i=4,j=7) >>> obj
a) a(i=4, j=7)
b) obj(i=4, j=7)
c) (4,7)
d) An exception is thrown
View Answer
Answer: a
Explanation: The above piece of code illustrates the concept of named tuples.
7 - Question
7. Tuples can’t be made keys of a dictionary.
a) True
b) False
View Answer
Answer: b
Explanation: Tuples can be made keys of a dictionary because they are hashable.
8 - Question
8. Is the following Python code valid?
>>> a=2,3,4,5 >>> a
a) Yes, 2 is printed
b) Yes, [2,3,4,5] is printed
c) No, too many values to unpack
d) Yes, (2,3,4,5) is printed
View Answer
Answer: d
Explanation: A tuple needn’t be enclosed in parenthesis.
9 - Question
9. What will be the output of the following Python code?
>>> a=(2,3,1,5) >>> a.sort() >>> a
a) (1,2,3,5)
b) (2,3,1,5)
c) None
d) Error, tuple has no attribute sort
View Answer
Answer: d
Explanation: A tuple is immutable thus it doesn’t have a sort attribute
10 - Question
10. Is the following Python code valid?
>>> a=(1,2,3) >>> b=a.update(4,)
a) Yes, a=(1,2,3,4) and b=(1,2,3,4)
b) Yes, a=(1,2,3) and b=(1,2,3,4)
c) No because tuples are immutable
d) No because wrong syntax for update() method
View Answer
Answer: c
Explanation: Tuple doesn’t have any update() attribute because it is immutable.
11 - Question
11. What will be the output of the following Python code?
>>> a=[(2,4),(1,2),(3,9)] >>> a.sort() >>> a
a) [(1, 2), (2, 4), (3, 9)]
b) [(2,4),(1,2),(3,9)]
c) Error because tuples are immutable
d) Error, tuple has no sort attribute
View Answer
Answer: a
Explanation: A list of tuples is a list itself. Hence items of a list can be sorted.