11/29: Dictionary Review

Which of these dictionaries has integers as the keys and strings as the values?

• 
• 
• 
• 

What is the value of supplies after this code is run?

• {"pencil": 12,

  "paper": 70, "notebooks": 10, "eraser": 20, "highlighters": 25}

• {"pencil": 12,

  "paper": 70, "notebooks": 10, "eraser": 20}

• {"pencil": 12,

  "paper": 30, "notebooks": 10, "eraser": 20,

  "paper": 40, "highlighters": 25}

• {"pencil": 12,

  "paper": 40, "notebooks": 10, "eraser": 20, "highlighters": 25}

What is the line of code to initialize an empty dictionary called thesaurus?

• thesaurus = new Dictionary()

• thesaurus = empty_dict()

• thesaurus = {}

• thesaurus = []

What will the following code output?

• ["veggie burger", "salad", "soda"]

• KeyError

• "fries"

• ["hot dog", "apple slices", "orange juice"]

Answer explanation

There is no key:value pair in this dictionary with a key of 3, so this code will produce an error.

What does the following code output?

• True

• False

• KeyError

• 10

Answer explanation

This code checks for the existence of "notebooks" as a key in the dictionary. Since it exists as a key, it will print True.

What is the output of the following code?

• 
• 
• 
• 

Answer explanation

This loop goes through each key in the dictionary and prints it.

What will the following code output?

• True

• KeyError

• 0

• False

Answer explanation

This code checks for the existence of "pen" as a key in the dictionary. "pen" is not a key.

What will the following code output?

• ["hamburger", "fries", "soda"]

• KeyError

• "soda"

• ["veggie burger", "salad", "soda"]

Answer explanation

["hamburger", "fries", "soda"] is the value associated with the key 2.

What is the output of the following code?

• 
• 
• 
• 

Answer explanation

This loop goes through each value in the dictionary and prints it.

What is the output of the following code?

• 'No Value'

• {"pencil": 12, "paper": 30, "notebooks": 10, "eraser": 20}

• {"paper": 30, "notebooks": 10, "eraser": 20}

• KeyError

Answer explanation

.pop() removes the key "pencil" and the associated value from the dictionary.