Python Miscellaneous

Question 1

What is the output of the following program : 

Python3

print "Hello World"[::-1]

• A. dlroW olleH
• B. Hello Worl
• C. d
• D. Error

Answer: (A)

[::] depicts extended slicing in Python and [::-1] returns the reverse of the string.

Question 2

Given a function that does not return any value, what value is shown when executed at the shell?

• A. int
• B. bool
• C. void
• D. None

Answer: (D)

Python explicitly defines the None object that is returned if no value is specified.

Question 3

Which module in Python supports regular expressions?

• A. re
• B. regex
• C. pyregex
• D. None of the above

Answer: (A)

re is a part of the standard library and can be imported using: import re.

Question 4

What is the output of the following program : 

Python3

print 0.1 + 0.2 == 0.3

• A. True
• B. False
• C. Machine dependent
• D. Error

Answer: (B)

Neither of 0.1, 0.2 and 0.3 can be represented accurately in binary. The round off errors from 0.1 and 0.2 accumulate and hence there is a difference of 5.5511e-17 between (0.1 + 0.2) and 0.3.

Question 5

Which of the following is not a complex number?

• A. k = 2 + 3j
• B. k = complex(2, 3)
• C. k = 2 + 3l
• D. k = 2 + 3J

Answer: (C)

l (or L) stands for long.

Question 6

What does ~~~~~~5 evaluate to?

• A. +5
• B. -11
• C. +11
• D. -5

Answer: (A)

~x is equivalent to -(x+1).

Question 7

Given a string s = “Welcome”, which of the following code is incorrect?

• A. print s[0]
• B. print s.lower()
• C. s[1] = ‘r’
• D. print s.strip()

Answer: (C)

strings are immutable in Python

Question 8

________ is a simple but incomplete version of a function.

• A. Stub
• B. Function
• C. A function developed using bottom-up approach
• D. A function developed using top-down approach

Answer: (A)

Question 9

To start Python from the command prompt, use the command ______

• A. execute python
• B. go python
• C. python
• D. run python

Answer: (C)

Question 10

Which of the following is correct about Python?

• A. It supports automatic garbage collection.
• B. It can be easily integrated with C, C++, COM, ActiveX, CORBA, and Java
• C. Both of the above
• D. None of the above

Answer: (C)