Prutor quiz 7

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

1.def, file

2.class, object  ----  Right Answer

3.self, .py file

4.None of these

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

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Q: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)

1.TypeError   --  Right Answer

2.231

3.321

4.None of these

shows Error because _init_() should return None, not 'int'.

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Q: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())

1.20   --   Right Answer

2.60

3.Error

4.Program runs but does not print anything

Reason_

-Here output will be the value of self.b

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

1.#, @

2.double underscore, single underscore  --  Right Answer

3.single underscore,double underscore

4.None of these

Reason_

to define a private method prefix member name with double underscore,whlie protected method  starts with single underscore.

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Q: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  --  Right Answer

2.true
     false
     true

3.code.py
     False
     True

4.file.txt
     False
     True

This code shows error because no such file or directory as file.txt