Python Questions and Answers – Numeric Types

This set of Python Multiple Choice Questions & Answers (MCQs) focuses on “Numeric Types”.

1. What is the output of print 0.1 + 0.2 == 0.3?
a) True
b) False
c) Machine dependent
d) Error
View Answer

Answer: b
Explanation: 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.

2. 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
View Answer

Answer: c
Explanation: l (or L) stands for long.

3. What is the type of inf?
a) Boolean
b) Integer
c) Float
d) Complex
View Answer

Answer: c
Explanation: Infinity is a special case of floating point numbers. It can be obtained by float(‘inf’).
advertisement
advertisement

4. What does ~4 evaluate to?
a) -5
b) -4
c) -3
d) +3
View Answer

Answer: a
Explanation: ~x is equivalent to -(x+1).

5. What does ~~~~~~5 evaluate to?
a) +5
b) -11
c) +11
d) -5
View Answer

Answer: a
Explanation: ~x is equivalent to -(x+1).
~~x = – (-(x+1) + 1) = (x+1) – 1 = x
~~x is equivalent to x
Extrapolating further ~~~~~~x would be same as x in the final result.
In the question, x value is given as 5 and “~” is repeated 6 times. So, the correct answer for “~~~~~~5” is 5.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

6. Which of the following is incorrect?
a) x = 30963
b) x = 0x4f5
c) x = 19023
d) x = 03964
View Answer

Answer: d
Explanation: Numbers starting with a 0 are octal numbers but 9 isn’t allowed in octal numbers.

7. What is the result of cmp(3, 1)?
a) 1
b) 0
c) True
d) False
View Answer

Answer: a
Explanation: cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y.
advertisement

8. Which of the following is incorrect?
a) float(‘inf’)
b) float(‘nan’)
c) float(’56’+’78’)
d) float(’12+34′)
View Answer

Answer: d
Explanation: ‘+’ cannot be converted to a float.

9. What is the result of round(0.5) – round(-0.5)?
a) 1.0
b) 2.0
c) 0.0
d) Value depends on Python version
View Answer

Answer: d
Explanation: The behavior of the round() function is different in Python 2 and Python 3. In Python 2, it rounds off numbers away from 0 when the number to be rounded off is exactly halfway through. round(0.5) is 1 and round(-0.5) is -1 whereas in Python 3, it rounds off numbers towards nearest even number when the number to be rounded off is exactly halfway through. See the below output.

advertisement

Here’s the runtime output for Python version 2.7 interpreter.

$ python
Python 2.7.17 (default, Nov  7 2019, 10:07:09)
>>> round(0.5)
1.0
>>> round(-0.5)
-1.0
>>>

In the above output, you can see that the round() functions on 0.5 and -0.5 are moving away from 0 and hence “round(0.5) – (round(-0.5)) = 1 – (-1) = 2

Here’s the runtime output for Python version 3.6 interpreter.

$ python3
Python 3.6.8 (default, Oct  7 2019, 12:59:55)
>>> round(0.5)
0
>>> round(-0.5)
0
>>> round(2.5)
2
>>> round(3.5)
4
>>>

In the above output, you can see that the round() functions on 0.5 and -0.5 are moving towards 0 and hence “round(0.5) – (round(-0.5)) = 0 – 0 = 0“. Also note that the round(2.5) is 2 (which is an even number) whereas round(3.5) is 4 (which is an even number).

10. What does 3 ^ 4 evaluate to?
a) 81
b) 12
c) 0.75
d) 7
View Answer

Answer: d
Explanation: ^ is the Binary XOR operator.

Sanfoundry Global Education & Learning Series – Python.

To practice all areas of Python, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.