QUESTION $1$

What is the correct structure to create a dictionary of months where each month will be accessed by its month number $($for example, January is month $1,$ April is month $4)?$

$\{1,2,...12$ : 'January', 'February',... 'December' $\}$

$\{1$ ; 'January', $2$ ; 'February', $...12$ ; 'December'$\}$

$\{1$ : 'January', $2$ : 'February', $...12$ : 'December' $\}$

$[\text{'}1\text{'}$ : 'January', $\text{'}2\text{'}$ : 'February', $...\text{'}12\text{'}$ : 'December' $]$

$10$ points

QUESTION $2$

Match the dictionary methods with their descriptions.

$-$

get

$-$

items

$-$

pop

$-$

values

A$.$

Pass in the key and the method returns the associated value. If the key is not found, an exception is not raised, and the default value is returned instead.

B$.$

Returns all the values in the dictionary as a sequence.

C$.$

Pass in the key and the method returns the associated value. The key$-$value pair is also removed from the dictionary. If the key is not found, a KeyValue exception is raised.

D$.$

Returns all the key$-$value pairs in the dictionary as a sequence of tuples.

$10$ points $($Extra Credit$)$

QUESTION $3$

In a dictionary, you use a$($n$)\_\_\_\_\_\_\_\_$ to locate a specific value.

datum

item

key

element

$10$ points

QUESTION $4$

A dictionary can include the same value several times but cannot include the same key several times.

True

False

$5$ points

QUESTION $5$

What will be displayed after the following code executes?

cities $=\{\text{'}$GA$\text{'}$: 'Atlanta', $\text{'}$NY$\text{'}$: 'Albany', $\text{'}$CA$\text{'}$: 'San Diego'$\}$

more$\_$cities $=\{\text{'}$NY$\text{'}$: 'Buffalo', $\text{'}$NC$\text{'}$: 'Raleigh', $\text{'}$OH$\text{'}$: 'Columus'$\}$

cities $|=$ more$\_$cities

print$($cities$[\text{'}$NY$\text{'}])$

Buffalo

Albany

KeyError

$\{\text{'}$NY$\text{'}$: 'Albany'$\}$

$10$ points

QUESTION $6$

If you try to retrieve a value from a dictionary using a nonexistent key, a KeyError exception is raised.

True

False

$5$ points

QUESTION $7$

What is the number of the first index in a dictionary?

$0$

$1$

the size of the dictionary minus one

Dictionaries are not indexed by number.

$10$ points

QUESTION $8$

The difference of set$1$ and set$2$ is a set that contains only the elements that appear in set$1$ but do not appear in set$2.$

True

False

$5$ points

QUESTION $9$

What will be displayed after the following code executes? $($Note: the order of the display of entries in a dictionary are not in a specific order.$)$

$\{\text{'}$FL$\text{'}$: 'Tallahassee'$\}$

KeyError

$\{\text{'}$CA$\text{'}$: 'San Diego', $\text{'}$NY$\text{'}$: 'Albany', $\text{'}$GA$\text{'}$: 'Atlanta'$\}$

$\{\text{'}$CA$\text{'}$: 'San Diego', $\text{'}$NY$\text{'}$: 'Albany', $\text{'}$GA$\text{'}$: 'Atlanta', $\text{'}$FL$\text{'}$ 'Tallahassee'$\}$

$10$ points

QUESTION $10$

Which of the following does not apply to sets?

The elements are in pairs.

The elements are unordered.

All the elements must be unique; you cannot have two elements with the same value.

The stored elements can be of different data types.

$10$ points

QUESTION $11$

In order to avoid KeyError exceptions, you can check whether a key is in the dictionary using the $\_\_\_\_\_\_\_\_$ operator.

in

included

isin

isnotin

$10$ points

QUESTION $12$

What is the value of the variable phones after the following code executes?

phones $=\{\text{'}$John$\text{'}$ : $\text{'}5555555\text{'},$ 'Julie' : $\text{'}5557777\text{'}\}$

phones$[\text{'}$John$\text{'}]=\text{'}5556666\text{'}$

$\{\text{'}$John$\text{'}$ : $\text{'}5555555\text{'},$ 'Julie' : $\text{'}5557777\text{'}\}$

$\{\text{'}$John$\text{'}$ : $\text{'}5556666\text{'},$ 'Julie' : $\text{'}5557777\text{'}\}$

$\{\text{'}$John$\text{'}$ : $\text{'}5556666\text{'}\}$

This code is invalid.

$10$ points

QUESTION $13$

Sets are immutable.

True

False