Python Quiz-5

Q1. What will be the output of following code:

class A:
    def __iter__(self):
        self.a = 1
        return self
    def __next__(self):
        x = self.a
        self.a += 1
        return x
a = A()
myiter = iter(a)
next(myiter)
print(next(myiter))

class A:

def __iter__(self):

self.a = 1

return self

def __next__(self):

x = self.a

self.a += 1

return x

a = A()

myiter = iter(a)

next(myiter)

print(next(myiter))

3
1
2
Error

Answer: 3
Explanation: To build a class/object as an iterator, we need the methods __iter__() and __next__().
The __next__() method return the next item in the sequence.
myiter = iter(a) => Creates an iterator.
next(myiter) will execute the __next__() method of class A.
Python Iterators

Q2. The following code will throw an error.

def fun(*x):
    print(x[2])

fun("a", "b", "c")

def fun(*x):

print(x[2])

fun("a", "b", "c")

True
False

Answer: 2
Explanation: *args are used as arbitrary Arguments. If we do not know how many arguments that will be passed into our function then we can add a * before the parameter name in the function definition.

Q3. What will be the output of following code:

print(len(" TheAI "), len(" TheAI ".strip()))

1	print(len(" TheAI "), len(" TheAI ".strip()))

Answer: 4
Explanation: strip() method removes any leading and trailing characters from a string.

Q4. What will be the output of following code:

print(('AILearner')*3)

1	print(('AILearner')*3)

(‘AILearner’,’AILearner’,’AILearner’)
AILearnerAILearnerAILearner
(‘AILearner3’)
Error

Answer: 2
Explanation: Here, * operator will multiply the content of string ‘AILearner’ 3 times.

Q5. What will be the output of following code:

class Language:
    def get_lang(self, line='Python'):
        print(line)
obj = Language()
obj.get_lang('Java')

class Language:

def get_lang(self, line='Python'):

print(line)

obj = Language()

obj.get_lang('Java')

Python
Java
Java
Python
Python
Java

Answer: 2
Explanation: Java is the correct answer.

Q6. What will be the output of following code:

x = [1,2]
x[3:4] = [3]
print(x)

x = [1,2]

x[3:4] = [3]

print(x)

[1, 2, 3]
[1, 3]
[1, 2]
Throws an error!

Answer: 1
Explanation: As the len(x) = 2, x[3:4] will add the data at the end of the list.
Extending a list in Python

Q7. Which of the following data types can have only two values (either True or False)?

integer
Strings
Boolean
Float

Answer: 3
Explanation: Booleans can only have one of two values: True of False.

Q8. What will be the output of print(2 * 3 ** 3 * 2)?

108
432
1458
36

Answer: 1
Explanation: ** is a power operator and it has higher precedence than * multiplication operator. So the equation will be solved as follows:
=> 2 * 3 ** 3 * 2
=> 2 * 27 * 2
=> 54 * 2
=> 108

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