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What will be the output of the following Python code?

l=[1, 0, 2, 0, 'hello', '', []]
list(filter(bool, l))
  • [1, 0, 2, ‘hello’, ”, []]
  • Error1
  • [1, 2, ‘hello’]
  • [1, 0, 2, 0, ‘hello’, ”, []]
Click to View Answer
[1, 2, ‘hello’]

Which function is called when the following Python program is executed?

f = foo()
format(f)
  • str()
  • format()
  • _str_()
  • _format_()
Click to View Answer
- [ ] __str__()

What will be the output of the following Python program?

def foo(x):
    x[0] = ['def']
    x[1] = ['abc']
    return id(x)
q = ['abc', 'def']
print(id(q) == foo(q))
  • Error
  • None
  • False
  • True
Click to View Answer
- [ ] True

What will be the output of the following Python program?

z=set('abc')
z.add('san')
z.update(set(['p', 'q']))
z
  • {‘a’, ‘c’, ‘c’, ‘p’, ‘q’, ‘s’, ‘a’, ‘n’}
  • {‘abc’, ‘p’, ‘q’, ‘san’}
  • {‘a’, ‘b’, ‘c’, ‘p’, ‘q’, ‘san’}
  • {‘a’, ‘b’, ‘c’, [‘p’, ‘q’], ‘san}
Click to View Answer
- [ ] {‘a’, ‘b’, ‘c’, ‘p’, ‘q’, ‘san’}

What will be the output of the following Python code?

print("abc. DEF".capitalize())
  • Abc. def
  • abc. def
  • Abc. Def
  • ABC. DEF
Click to View Answer
- [ ] Abc. def

What will be the output of the following Python code?

def foo():
    try:
        return 1
    finally:
        return 2
k = foo()
print(k)
  • 1
  • 2
  • 3
  • error, there is more than one return statement in a single try-finally block
Click to View Answer
- [ ] 2

Which of the following best describes inheritance?

  • Ability of a class to derive members of another class as a part of its own definition
  • Means of bundling instance variables and methods in order to restrict access to certain class members
  • Focuses on variables and passing of variables to functions
  • Allows for implementation of elegant software that is well designed and easily modified
Click to View Answer
- [ ] Ability of a class to derive members of another class as a part of its own definition

Suppose B is a subclass of A, to invoke the init method in A from B, what is the line of code you should write?

  • A.init(self)
  • B.init(self)
  • A.init(B)
  • B.init(A)
Click to View Answer
- [ ] A.__init__(self)

What will be the output of the following Python code?

class A:
    def __init__(self, x= 1):
        self.x = x
class der(A):
    def __init__(self,y = 2):
        super().__init__()
        self.y = y
def main():
    obj = der()
    print(obj.x, obj.y)
main()
  • Error, the syntax of the invoking method is wrong
  • The program runs fine but nothing is printed
  • 1 0
  • 1 2
Click to View Answer
- [ ] 1 2

What does built-in function type do in context of classes?

  • Determines the object name of any value
  • Determines the class name of any value
  • Determines class description of any value
  • Determines the file name of any value
Click to View Answer
- [ ] Determines the class name of any value

What is the biggest reason for the use of polymorphism?

  • It allows the programmer to think at a more abstract level
  • There is less program code to write
  • The program will have a more elegant design and will be easier to maintain and update
  • Program code takes up less space
Click to View Answer
- [ ] The program will have a more elegant design and will be easier to maintain and update

A class in which one or more methods are only implemented to raise an exception is called an abstract class.

  • True
  • False
Click to View Answer
- [ ] True

Which of the following is the most suitable definition for encapsulation?

  • Ability of a class to derive members of another class as a part of its own definition
  • Means of bundling instance variables and methods in order to restrict access to certain class members
  • Focuses on variables and passing of variables to functions
  • Allows for implementation of elegant software that is well designed and easily modified
Click to View Answer
- [ ] Means of bundling instance variables and methods in order to restrict access to certain class members

What will be the output of the following Python code?

sentence = 'we are humans'
matched = re.match(r'(.*) (.*?) (.*)', sentence)
print(matched.groups())
  • (‘we’, ‘are’, ‘humans’)
  • (we, are, humans)
  • (‘we’, ‘humans’)
  • ‘we are humans’
Click to View Answer
- [ ] (‘we’, ‘are’, ‘humans’)

What will be the output shape of the following Python code?

import turtle
t=turtle.Pen()
for i in range(0,4):
	t.forward(100)
	t.left(120)
  • square
  • rectangle
  • triangle
  • kite
Click to View Answer
- [ ] triangle

What does os.close(f) do?

  • terminate the process f
  • terminate the process f if f is not responding
  • close the file descriptor f
  • return an integer telling how close the file pointer is to the end of file
Click to View Answer
- [ ] close the file descriptor f

Which of the following is equivalent to random.randint(3, 6)?

  • random.choice([3, 6])
  • random.randrange(3, 6)
  • 3 + random.randrange(3)
  • 3 + random.randrange(4)
Click to View Answer
- [ ] 3 + random.randrange(4)

What will be the output of the following Python code?

x = [[0], [1]]
print((' '.join(list(map(str, x))),))
  • (‘[0] [1]’,)
  • (’01’)
  • [0] [1]
  • 01
Click to View Answer
- [ ] (‘[0] [1]’,)

What will be the output of the following Python code?

elements = [0, 1, 2]
def incr(x):
    return x+1
print(list(map(elements, incr)))
  • [1, 2, 3]
  • [0, 1, 2]
  • error
  • none of the mentioned
Click to View Answer
- [ ] error

Which module in the python standard library parses options received from the command line?

  • getopt
  • os
  • getarg
  • main
Click to View Answer
- [ ] getopt

Which of the following statements are true?

  • When you open a file for reading, if the file does not exist, an error occurs
  • When you open a file for writing, if the file does not exist, a new file is created
  • When you open a file for writing, if the file exists, the existing file is overwritten with the new file
  • All of the mentioned
Click to View Answer
- [ ] All of the mentioned

What will be the output of the following Python code?

l1=[1, 2, 3, [4]] l2=list(l1) id(l1)==id(l2)

  • True
  • False
  • Error
  • Address of l1
Click to View Answer
- [ ] False

What will be the output of the following Python code snippet?

z=set('abc')
z.add('san')
z.update(set(['p', 'q']))
z
  • {‘abc’, ‘p’, ‘q’, ‘san’}
  • {‘a’, ‘b’, ‘c’, [‘p’, ‘q’], ‘san}
  • {‘a’, ‘c’, ‘c’, ‘p’, ‘q’, ‘s’, ‘a’, ‘n’}
  • {‘a’, ‘b’, ‘c’, ‘p’, ‘q’, ‘san’}
Click to View Answer
- [ ] {‘a’, ‘b’, ‘c’, ‘p’, ‘q’, ‘san’}

What is the difference between threading.Lock and threading.RLock?

  • Lock is owned by a thread while RLock is owned by many.
  • Lock is owned by none while RLock is owned by many.
  • Lock and RLock both primitives are owned by a single thread.
  • Lock and RLock both primitives are owned by many.
Click to View Answer
- [ ] Lock is owned by none while RLock is owned by many.

What is the difference between a semaphore and bounded semaphore?

  • Semaphore holds a counter for the number of release() calls minus the number of acquire() calls, plus an initial value but bounded semaphore doesn't.
  • Bounded semaphore holds a counter for the number of release() calls minus the number of acquire() calls, plus an initial value but semaphore doesn't.
  • A bounded semaphore makes sure its current value doesn’t exceed its initial value while semaphore doesn't.
  • A semaphore makes sure its current value doesn’t exceed its initial value while bounded semaphore doesn't.
Click to View Answer
- [ ] A bounded semaphore makes sure its current value doesn’t exceed its initial value while semaphore doesn't.

Algorithm

  1. Write a Python function to find the largest element in an array or list.

  2. Given an array of integers, find two numbers such that they add up to a specific target sum.

  3. Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if:

    • Open brackets must be closed by the same type of brackets.
    • Open brackets must be closed in the correct order.
    • Every close bracket has a corresponding open bracket of the same type.

    Example 1: Input: s = "()" Output: true Example 2: Input: s = "()[]{}" Output: true Example 3: Input: s = "(]" Output: false

  4. finding the minimum value in a sliding window of a fixed size in an array