Quizzes

Question 1

What is a dictionary in Python?

Answer 1

An unordered collection of key-value pairs

Question 2

What is the primary requirement for keys in a Python dictionary?

Answer 2

They must be unique and immutable.

Question 3

How can you create an empty dictionary in Python?

Answer 3

{}

Question 4

What does the built-in function ‘len; return for a dictionary?

Answer 4

Number of key-value pairs.

Question 5

How can you obtain a list of a dictionary’s keys in sorted order?

Answer 5

sorted(dict.keys())

Question 6

What does the ‘==’ operator check for when used with dictionaries?

Answer 6

identical contents of key-value pairs.

Question 7

What do dictionary comprehensions provide a convenient notation for?

Answer 7

Quickly generating dictionaries.

Question 8

What is a set in Python?

Answer 8

An unordered collection of key-value pairs.

Question 9

What is a significant characteristic of sets during iteration?

Answer 9

They are unordered

Question 10

How can you create an empty set in Python?

Answer 10

set()

Question 11

What is the recommended way to import the NumPy library?

Answer 11

import numpy as np

Question 12

what does the NumPy array function do?

Answer 12

Copies its argument’s contents into the array

Question 13

What attribute of an array provides information about its number of dimensions?

Answer 13

ndim

Question 14

What does the ‘linspace’ function in NumPy do?

Answer 14

Produces evenly spaced floating-point ranges

Question 15

What is broadcasting in NumPy

Answer 15

Performing element-wise calculations with a scalar and an array

Question 16

What does element-wise arithmetic mean in the context of NumPy arrays?

Answer 16

Performing calculations on each element of an array.

Question 17

How can you select an element in a two-dimensional array in NumPy?

Answer 17

Providing a tuple containing row and column indices

Question 18

What is the difference between ‘reshape’ and ‘resize’ in NumPy?

Answer 18

‘resize’ modifies the original array; ‘reshape’ returns a view

Question 19

How can you transpose an array in NumPy?

Answer 19

Using the ‘transpose’ method.

Question 20

What does ‘vstack’ do in NumPy?

Answer 20

Combines two arrays by adding rows.

Question 21

In creating custom functions, which of the following is not used when defining functions?

Answer 21

arguments list

Question 22

This can only be used inside the function and exist only while the function is executing.

Answer 22

Local variables

Question 23

A function with multiple parameters specifies them in a(n)?

Answer 23

Comma-separated list

Question 24

This function generates an integer from the first argument value up to, but not including, the second argument value.

Answer 24

randrange function

Question 25

This operator tests whether its right operand’s iterable contains its left operand’s value.

Answer 25

in operator

Question 26

When an argument with a default parameter value is omitted in a function call, the interpreter automatically passes the default parameter value in the call.

Answer 26

True, because the functions has a default parameter value.

Question 27

Parameters with default parameter values must be the leftmost arguments in a function’s parameter list.

Answer 27

False, parameters with default parameter values must appear to the right of parameters that do not have defaults.

Question 28

Keyword arguments must be passed in the same order as their corresponding parameters in the function definition’s parameter list.

Answer 28

False, the order of keyword arguments does not matter.

Question 29

To define a function with an arbitrary argument list, specify a parameter of the form ____.

Answer 29

*args (The name args is used by convention, but is not required.)

Question 30

A method is simply a function that you call on an object using which of the following form?

Answer 30

object_name.method_name(arguments)

Question 31

These are prepackaged data structures consisting of related data items.

Answer 31

Collection

Question 32

Which of the following is true?
a. Lists typically store homogeneous data, that is, values of the same data type.
b. Lists may also store heterogeneous data, that is, data of many different types.
c. Both A and B.
d. None of these.

Answer 32

c. Both A and B

Question 33

Which of the following is not part of the way to access a list element?

Answer 33

the index value always starts by 0

Question 34

Python’s string and tuple sequences are immutable, which means?

Answer 34

Changing string and tuple values is not allowed.

Question 35

Which of the following is not true about concatenation?

a. You can concatenate two lists, two tuples or two strings.
b. You can concatenate using the + operator.
c. The result is a new sequence of the same type containing the right operand’s elements followed by the left operand’s elements.
d. The original sequences are unchanged.

Answer 35

c. The result is a new sequence of the same type containing the right operand’s elements followed by the left operand’s elements.

Question 36

Which of the following process in tuples is not allowed?
a. Adding Items to a String or Tuple
b. Appending Tuples to Lists
c. Tuples May Contain Mutable Objects
d. None of the above.

Answer 36

d. None of the above.

Question 37

Which of the following is true about unpacking sequences?

a. You can unpack any sequence’s elements by assigning the sequence to a comma-separated list of variables.
b. A ValueError occurs if the number of variables to the left of the assignment symbol is not identical to the number of elements in the sequence on the right.
c. Both A and B.
d. None of these.

Answer 37

c. Both A and B.

Question 38

The following expression causes an error:

’-‘ * 10

a. True, using the multiplication operator of nonnumeric value of ‘-‘ is not allowed.
b. True, 10 cannot be multiplied with ‘-‘.
c. False, in this context, the multiplication operator (*) repeats the string (‘-‘) 10 times.
d. False, the result of this expression is: ———

Answer 38

c. False, in this context, the multiplication operator (*) repeats the string (‘-‘) 10 times.

Question 39

Which of the following is not true about sequence slicing?

a. You can slice sequences to create new sequences of the same type containing subsets of the original elements.
b. Slice operations can modify mutable sequences.
c. Those that do not modify a sequence work identically for lists, tuples and strings.
d. None of these.

Answer 39

d. None of these.

Question 40

What happens when both the start and end indices are omitted in sequence slicing?

Answer 40

Copies the entire sequence

Question 41

Which of the following is not allowed in del statements?

a. Deleting the Element at a Specific List Index
b. Deleting a Slice from a List
c. Deleting a Slice Representing the Entire List
d. None of these.

Answer 41

d. None of these.

Question 42

Which of the following is not true about sorting lists?

a. To use the sort() method, the object name should be placed inside its parentheses.
b. To sort a list in descending order, call list method sort with the optional keyword argument reverse set to True.
c. Built-in function sorted returns a new list containing the sorted elements of its argument sequence.
d. List method sort modifies a list to arrange its elements in ascending order by default.

Answer 42

a. To use the sort() method, the object name should be placed inside its parentheses.

Question 43

Which of the following is not true about searching sequences?

a. Searching is the process of locating a key.
b. List method index takes as an argument a search key—the value to locate in the list—then searches through the list from index 0 and returns the index of the last element that matches the search key.
c. Using method index’s optional arguments, you can search a subset of a list’s elements.
d. Operator in tests whether its right operand’s iterable contains the left operand’s value.

Answer 43

b. List method index takes as an argument a search key—the value to locate in the list—then searches through the list from index 0 and returns the index of the last element that matches the search key.

Question 44

Which of the following is true about Simulating Stacks with Lists?

a. Python does have a built-in stack type, but you can think of a stack as a constrained list.
b. You push using list method append, which adds a new element to the start of the list.
c. You pop using list method pop with some arguments, which removes and returns the item at the end of the list.
d. Items are retrieved from stacks in first-in, last-out (FILO) order.

Answer 44

d. Items are retrieved from stacks in first-in, last-out (FILO) order.

Question 45

Which is not true about generator expressions?

a. A generator expression is similar to a list comprehension, but creates an iterable generator object that produces values on demand.
b. Generator expressions have the same capabilities as list comprehensions, but are defined in parentheses instead of square brackets.
c. Generator expression creates a list of its generated values.
d. Generator expressions use lazy evaluation.

Answer 45

c. Generator expression creates a list of its generated values.

Question 45

Which of the following is allowed in list comprehensions?

a. Using a List Comprehension to Create a List of Integers
b. Mapping is Performing Operations in a List Comprehension’s Expression
c. Filtering is List Comprehensions with if Clauses
d. All of these.

Answer 45

d. All of these.

Question 45

Which is not true when using lambda expressions?
a. Lambda expression is used to define the function inline where it’s needed.
b. A lambda expression is an anonymous function—that is, a function without a name.
c. A lambda begins with the lambda keyword followed by a comma-separated parameter list, a semi-colon (;) and an expression.
d. A lambda implicitly returns its expression’s value.

Answer 45

c. A lambda begins with the lambda keyword followed by a comma-separated parameter list, a semi-colon (;) and an expression.

Question 46

Lists that require two indices to identify an element are called?

a. two-dimensional lists
b. double-indexed lists
c. double-subscripted lists
d. All of these.

Answer 46

d. All of these.

Question 47

In the given 3-by-3 list grade_list, what is the value of the element in grade_list[1][2]?

Answer 47

90

Question 48

In a two-dimensional list, the first index by convention identifies the of an element and the second index identifies the of an element.

Answer 48

row, column