Deck 4: Introducing the Python Collections: Lists, Dictionaries, Tuples, and Statistics

Question 1

Case Study 1:
1. >>> m
2. >>> ??????
3. print(answer)
Output:
A
B
E
A
D
B
B
A
C
E
-Refer to the session in the accompanying Case Study 1. What program statements appear on line 2 to create the output listed in the case study?

A) if answer in myAnswers:
B) for answer in myAnswers:
C) print myAnswers:
D) for answer = myAnswers:

Answer 1

B

Question 2

How is an empty list represented in Python?

A) []
B) ()
C) **
D) &It;>

Answer 2

A

Question 3

What will be the output based on the following lines of code?
>>> myList = [3, "cat", 6.5, 2]
>>> myList

A) 3
B) 4
C) [3, 'cat', 6.5, 2]
D) An error message because a list cannot contain different types of data

Answer 3

C

Question 4

What is the membership operator for lists?

A) []
B) +
C) *
D) in

Question 5

Case Study 2:
>>> changeList = [1, 2, "buckle my shoe", 3, 4,
"shut the door"]
2. >>> changeList
3. [1, 2, 'buckle my shoe', 3, 4, 'shut the door']
4. >>> changeList[2] = "the sky is blue"
5. >>> changeList
6. ??????
7. >>> name = "Monte"
8. >>> name[2] = "x"
9. ??????
-Refer to the session in the accompanying Case Study 2. What will be the output on line 6?

A) 'the sky is blue'
B) [1, 'the sky is blue', "buckle my shoe", 3, 4, 'shut the door']
C) [1, 2, 'the sky is blue', 3, 4, 'shut the door']
D) TypeError:object does not support item assignment

Question 6

Case Study 2:
>>> changeList = [1, 2, "buckle my shoe", 3, 4,
"shut the door"]
2. >>> changeList
3. [1, 2, 'buckle my shoe', 3, 4, 'shut the door']
4. >>> changeList[2] = "the sky is blue"
5. >>> changeList
6. ??????
7. >>> name = "Monte"
8. >>> name[2] = "x"
9. ??????
-Refer to the session in the accompanying Case Study 2. What will be the output on line 9?

A) "Monte"
B) "x"
C) "Moxte"
D) TypeError:object does not support item assignment

Question 7

Python provides the ____ function to create a list from a range or string.

A) list
B) append
C) insert
D) []

Question 8

The ____ list function removes and returns the last item in a list.

A) pop()
B) reverse()
C) remove(item)
D) count(item)

Question 9

One of the most often used measures of a collection of data is known as:

A) range.
B) central tendency.
C) dispersion.
D) mode.

Question 10

A Python ____ is a collection of associated pairs of items where each pair consists of a key and a value.

A) list
B) range
C) dictionary
D) string

Question 11

Case Study 3:
>>> ages = {'David':45, 'Brenda':46}
>>> ages
{'David': 45, 'Brenda': 46}
>>>
-Refer to the session in the accompanying Case Study 3. What will be the output after the following statement?
>>> ages['David']

A) {'David': 45}
B) 45
C) 'Brenda'
D) ages

Question 12

Case Study 3:
>>> ages = {'David':45, 'Brenda':46}
>>> ages
{'David': 45, 'Brenda': 46}
>>>
-Refer to the session in the accompanying Case Study 3. What will be the output after the following statement?
>>> ages['Kelsey'] = 19
>>> ages

A) 19
B) 'Kelsey'
C) {'Kelsey': 19}
D) {'David': 45, 'Brenda': 46, 'Kelsey': 19}

Question 13

What method is used to retrieve the value from a dictionary associated with a given key?

A) values
B) keys
C) get
D) del

Question 14

What statement is used to remove an entry from a dictionary based on a given key?

A) get
B) keys
C) del
D) index

Question 15

What represents the value(s) that occur most often in a set of data?

A) Average
B) Mode
C) Mean
D) Frequency distribution

Question 16

Lists in Python are sequences.

Question 17

Strings are mutable collections of data in which individual items within the string cannot be changed.

Question 18

The following Python statement creates a list of even numbers in ascending order:
list(range(10, 2, -2))

Question 19

Case Study 3:
>>> ages = {'David':45, 'Brenda':46}
>>> ages
{'David': 45, 'Brenda': 46}
>>>
-Refer to the session in the accompanying Case Study 3. The reference ages refers to a list.

Question 20

The values() method returns a dict_values object that behaves much like a list of the values in a dictionary.

Question 21

Match each definition with its term.
-Found by locating the item that occurs in the exact middle of a collection.

A) Median
B) Mode
C) Dispersion
D) Mean

Question 22

Match each definition with its term.
-The most frequently occurring value in a collection.

A) Median
B) Mode
C) Dispersion
D) Mean

Question 23

Match each definition with its term.
-Measure of how spread out data values in a collection are.

A) Median
B) Mode
C) Dispersion
D) Mean

Question 24

Match each definition with its term.
-Calculated by adding up the values in a collection and dividing by the number of items.

A) Median
B) Mode
C) Dispersion
D) Mean

Question 25

Define the concept of a list and describe some specific characteristics of lists in Python.

Question 26

Explain the meaning of the terms mutable and immutable.

Question 27

Describe the use of the split method for lists and provide an example of its use.

Question 28

How can Python be used to calculate dispersion?

Question 29

An interesting question arises when we consider what would happen if we did not have a built-in function to return the maximum value in the list. We could conceivably construct our own getMax function by iterating through the items in the list and keeping track of the largest value that we encounter. Provide an implementation of such a function.

Question 30

How would you use Python to find the mean value in a list?

Question 31

How would you find the mode of a list in Python?

Question 32

Describe two characteristics of Python dictionaries.

Question 33

How might you use Python to visualize a frequency distribution?