Python Basics Question and Answers

Python Built-in Functions

1. What are the outcomes of the following functions?

chr(‘97’)
chr(97)
a) a and Erro
b) ‘a’
c) Error
d) Error
Answer:
c) Error
EXPLANATION:

The built-in function chr() returns the alphabet corresponding to the value given as an argument. This function accepts only integer type values. In the first function, we have passed a string. Hence the first function throws an error.

2. What is the output of the following function? complex(1+2j)

a) Error
b) 1
c) 2j
d) 1+2j
Answer:
d
EXPLANATION:

The built-in function complex() returns the argument in a complex form. Hence the output of the function shown above will be 1+2j.

3. What is the output of the function complex() ?

a) 0j
b) 0+0j
c) 0
d) Error
Answer:
a
EXPLANATION:

The complex function returns 0j if both of the arguments are omitted, that is, if the function is in the form of complex() or complex(0), then the output will be 0j.

4. The function divmod(a,b), where both ‘a’ and ‘b’ are integers is evaluated as:

a) (a%b, a//
b) (a//b, a%
c) (a//b, a*
d) (a/b, a%
Answer:
b
EXPLANATION:

The function divmod(a,b) is evaluated as a//b, a%b, if both ‘a’ and ‘b’ are integers.

5. What is the output of the functions shown below?

divmod(10.5,5)
divmod(2.4,1.2)
a) (2.00, 0.50) and (2.00, 0.00)
b) (2, 0.5) and (2, 0)
c) (2.0, 0.5) and (2.0, 0.0)
d) (2, 0.5) and (2)
Answer:
c
EXPLANATION:

See python documentation for the function divmod.

6. The function complex(‘2-3j’) is valid but the function complex(‘2 – 3j’) is invalid. State whether this statement is true or false.

a) True
b) False
Answer:
a
EXPLANATION:

When converting from a string, the string must not contain any blank spaces around the + or – operator. Hence the function complex(‘2 – 3j’) will result in an error.

7. What is the output of the function shown below?

list(enumerate([2, 3]))
a) Error
b) [(1, 2), (2, 3)]
c) [(0, 2), (1, 3)]
d) [(2, 3)]
Answer:
c
EXPLANATION:

The built-in function enumerate() accepts an iterable as an argument. The function shown in the above case returns containing pairs of the numbers given, starting from 0. Hence the output will be: [(0, 2), (1,3)].

8. What are the outcomes of the function shown below?

x=3 eval('x^2')
a) Error
b) 1
c) 9
d) 6
Answer:
b
EXPLANATION:

The function eval is use to evaluate the expression that it takes as an argument. In the above case, the eval() function is used to perform XOR operation between 3 and 2. Hence the output is 1.

9. What is the output of the functions shown below?

float('1e-003')
float('2e+003')
a) 3.00 and 300
b) 0.001 and 2000.0
c) 0.001 and 200
d) Error and 2003
Answer:
b
EXPLANATION:

The output of the first function will be 0.001 and that of the second function will be 2000.0. The first function created a floating point number up to 3 decimal places and the second function adds 3 zeros after the given number.

10. Which of the following functions does not necessarily accept only iterables as arguments?

a) enumerate()
b) all()
c) chr()
d) max()
Answer:
c
EXPLANATION:

The functions enumerate(), all() and max() accept iterables as arguments whereas the function chr() throws an error on receiving an iterable as an argument. Also note that the function chr() accepts only integer values.