PYTHON QUIZ 8(Solution with the Answer)

PYTHON QUIZ 8

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1. In python, a class is created by ____ keyword, and to create ____ of the class, we will have to use constructor of class.

·         def, file

·         class, object

·         self, .py file

·         None of these

Ans(b): class, object

Reason:  We start the class definition with the class keyword followed by the constructor of class.

2. What will be the output of the following python code?

class Roll:

    def __init__(self, id):

        self.id = id

        id = 231

        return id

 

val = Roll(321)

print (val.id)

·         TypeError

·         231

·         321

·         None of these

Ans(a): TypeError

Reason:  _init_ should return none.

 

3.  What will be the output of following python code?

class X:

    def __init__(self):

         self.a = 10

         self._b = 20

         self.b = 20

    def getB(self):

         return self.b

 

x = X()

x._b = 60

print(x.getB())

·         20

·         60

·         Error

·         Program runs but does not print anything

Ans(a): 20

Reason: at last self ._b=20  and def getB(self) Print(x.getB())

4. Private method in python starts with ____ while protected methods starts with ____ .

·         #, @

·         double underscore, single underscore

·         single underscore,double underscore

·         None of these

Ans(b): double underscore, single underscore

Reason: A double underscore prefixed to a variable makes it private.

5. What will be the output of the following code. Code is saved in a file named 'code.py' :

f = open('file.txt')

f.readlines()

print(f.name)

print ( f.closed )

f.close()

print ( f.closed )

1.Error in code

2.true

     false

     true

3.code.py

     False

     True

4.file.txt

     False

     True

Ans(a): Error in code

Reason: Because ‘file.text’ doesn’t in system database.

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