Deck 5: Lists and Dictionaries

Question 1

Although a list's elements are always ordered by position, it is possible to impose a natural ordering on them as well.

Answer 1

True

Question 2

A function can be defined in a Python shell, but it is more convenient to define it in an IDLE window, where it can be saved to a file.

Answer 2

True

Question 3

An Identity function usually tests its argument for the presence or absence of some property.

Answer 3

False

Question 4

In scripts that include the definitions of several cooperating functions, it is often useful to define a special function named init that serves as the entry point for the script.

Question 5

Anytime you foresee using a list whose structure will not change, you can, and should, use a tuple instead.

Question 6

When replacing an element in a list, the subscript is used to reference the target of the assignment statement, which is not the list but an element's position within it.

Question 7

A list is a sequence of data values called indexes.

Question 8

To prevent aliasing, a new object can be created and the contents of the original can be copied to it.

Question 9

The definition of the main function and the other function definitions can appear in no particular order in the script, as long as main is called at the very end of the script.

Question 10

A list is immutable.

Question 11

Each item in a list has a unique index that specifies its position.

Question 12

A Python dictionary is written as a sequence of key/value pairs separated by commas. These pairs are sometimes called indexes.

Question 13

The index of the last item in a list is the length of the list.

Question 14

The == operator returns True if the variables are aliases for the same object. Unfortunately, == returns False if the contents of two different objects are the same.

Question 15

The is operator has no way of distinguishing between object identity and structural equivalence.

Question 16

The index of the first item in a list is 1.

Question 17

The main function usually expects no arguments and returns no value.

Question 18

Lists of integers can be built using the range function.

Question 19

The list method ascending mutates a list by arranging its elements in ascending order.

Question 20

The print function strips the quotation marks from a string, but it does not alter the look of a list.

Question 21

When a Python script is running as a standalone program, what will the __name__ variable be set to?

A) The variable will hold the name of the script itself.
B) The variable will be set to "__main__".
C) The variable will be set to "standalone".
D) The variable will be set to "None".

Question 22

What operator should you utilize if you wish to test for object identity between two objects?

A) ==
B) is
C) !=
D) @!

Question 23

A lookup table is a type of dictionary.

Question 24

In order to create a docstring for a defined function, where should the docstring be?

A) The docstring should be just before the declaration of def.
B) The docstring should be placed at the end of the execution block for the function.
C) The docstring should be the next indented line after the def statement.
D) The docstring should be placed at the end of the function, before the return statement.

Question 25

What are the two arguments expected by the get method for a dictionary object? (Choose two.)

A) A possible key.
B) An index position.
C) A list of keys.
D) A default value.

Question 26

What statement regarding the use of lists is accurate?

A) The individual elements within a list are immutable, in that the values cannot be changed.
B) Two lists cannot be concatenated together, without the creation of a third list.
C) A list can be sliced into sublists.
D) When a list is evaluated, the elements are not evaluated.

Question 27

If pop is used with just one argument and this key is absent from the dictionary, Python raises an error.

Question 28

In a dictionary, a -> separates a key and its value.

Question 29

What statement accurately describes what a mutator is in the Python language?

A) A mutator is a method that converts immutable data into mutable data.
B) A mutator is a method used to encrypt text.
C) A mutator is a method that is devoted entirely to the modification of the internal state of an object.
D) A mutator is a method that changes the structure of a block of Python code.

Question 30

In a Python dictionary, an association is formed between what two components of the dictionary? (Choose two.)

A) lists
B) keys
C) values
D) indexes

Question 31

What method should you utilize to add the elements of list2 onto the end of list1?

A) list1.extend(list2)
B) list1.append(list2)
C) list2.append(list1)
D) list2.extend(list1)

Question 32

You add a new key/value pair to a dictionary by using the subscript operator [].

Question 33

What statement accurately describes the use of a parameter in Python?

A) A parameter is the name used in the function definition for an argument that is passed to the function when it is called.
B) A parameter is the name used for a function that is then referenced by other parts of the program.
C) A parameter is the name used for data that is returned from the execution of a function.
D) A parameter is the name given to an acceptable range of values that are output from a program.

Question 34

The median of a list of values is the value that occurs most frequently.

Question 35

You are designing a script that may be imported as a module in other scripts. What variable can you use to check whether the script has been imported as a module, or is running as the main script?

A) __parent__
B) __name__
C) __operating_mode__
D) __status__

Question 36

What list method should you use in order to remove and return the element at the end of the list named "books"?

A) books.get()
B) books.pop()
C) books.fetch()
D) books.pull()

Question 37

What happens if you attempt to pop a key from a dictionary and the key does not exist, and you specified no default return?

A) The pop will return a None value.
B) The pop will return a value of 0.
C) The pop will return a value of False.
D) An error will be raised.

Question 38

What is the return value for a function that has no return statement defined?

A) The function will return a value of False.
B) The function will return a value of True, provided there are no errors.
C) The function will return a NULL value.
D) The function will return a special value of None.

Question 39

What statement accurately describes the difference between a list and a tuple?

A) A list is immutable, while a tuple is not.
B) A list is created with elements in parentheses, while a tuple is created with square brackets.
C) A tuple's contents cannot be changed.
D) A tuple can only hold integer and float data.

Question 40

A list is a sequence of data values known by either of what two terms? (Choose two.)

A) cards
B) instances
C) items
D) elements

Question 41

When creating a list of items whose structure will not change, what should you ideally use to contain the values?

A) lists
B) tuples
C) dictionaries
D) strings

Question 42

In computer science, what are two names that are used to describe data structures organized by association? (Choose two.)

A) matrices
B) tables
C) association lists
D) family trees

Question 43

What happens if you use the following statement to sort a list of numbers called numbers? numbers = numbers.sort()

A) numbers is a value of None
B) The list is now ordered in ascending order.
C) The list is now ordered in descending order.
D) The numbers variable becomes a reference to a sorted list.

Question 44

When declaring a tuple, you enclose the tuple's elements in what two characters?

A) []
B) ()
C) {}
D) "Y"

Question 45

What dictionary method can be utilized to access the entries in a dictionary variable with a name of parts?

A) parts.list()
B) parts.items()
C) parts.print()
D) parts.show()

Question 46

What statement correctly defines what a median is?

A) A median is the minimum value that is smaller than all other values in a set.
B) A median is the maximum value that is greater than all other values in a set.
C) A median is the value that is less than half the numbers in a set and greater than the other half.
D) A median is the sum of all odd values in a set.

Question 47

You are creating a Python script that will make use of user input contact names and their associated phone numbers. What would be ideal for storing and accessing these associated values?

A) lists
B) tuples
C) dictionaries
D) strings

Question 48

If you use the range method with a single parameter of 50, what will be the range of integers included in the returned list?

A) 0 through 50
B) 0 through 49
C) 1 through 50
D) 1 through 49

Question 49

Which of the following assigns a dictionary list of keys and values to the variable named persons?

A) persons = ["Sam":"CEO", "Julie":"President"]
B) persons = ("Sam":"CEO", "Julie":"President")
C) persons = {"Sam":"CEO", "Julie":"President"}
D) persons = {["Sam", "CEO"], ["Julie", "President"]}

Question 50

What dictionary operation can you use to remove all the keys within the dictionary named contacts?

A) contacts.delete()
B) contacts.remove()
C) contacts.clear()
D) contacts.dump()