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
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
Explanation: l (or L) stands for long.
3. What is the type of inf?
a) Boolean
b) Integer
c) Float
d) Complex
View Answer
Explanation: Infinity is a special case of floating point numbers. It can be obtained by float(‘inf’).
4. What does ~4 evaluate to?
a) -5
b) -4
c) -3
d) +3
View Answer
Explanation: ~x is equivalent to -(x+1).
5. What does ~~~~~~5 evaluate to?
a) +5
b) -11
c) +11
d) -5
View Answer
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.
6. Which of the following is incorrect?
a) x = 30963
b) x = 0x4f5
c) x = 19023
d) x = 03964
View Answer
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
Explanation: cmp(x, y) returns 1 if x > y, 0 if x == y and -1 if x < y.
8. Which of the following is incorrect?
a) float(‘inf’)
b) float(‘nan’)
c) float(’56’+’78’)
d) float(’12+34′)
View Answer
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
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.
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
Explanation: ^ is the Binary XOR operator.
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