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Python Data Structures Week 5 Quiz Answers

Chapter Nine: Dictionaries

Question 1) How are Python dictionaries different from Python lists?

• Python lists maintain order and dictionaries do not maintain order
• Python lists can store strings and dictionaries can only store words
• Python dictionaries are a collection and lists are not a collection
• Python lists store multiple values and dictionaries store a single value

Question 2) What is a term commonly used to describe the Python dictionary feature in other programming languages?

• Sequences
• Closures
• Lambdas
• Associative arrays

Question 3) What would the following Python code print out?

stuff = dict()
print(stuff['candy'])

• -1
• 0
• candy
• The program would fail with a traceback

Question 4) What would the following Python code print out?

stuff = dict()
print(stuff.get('candy',-1))

• The program would fail with a traceback
• 0
• -1
• ‘candy’

Question 5) When you add items to a dictionary they remain in the order in which you added them.

• True
• False

Question 6) What is a common use of Python dictionaries in a program?

• Sorting a list of names into alphabetical order
• Computing an average of a set of numbers
• Splitting a line of input into words using a space as a delimiter
• Building a histogram counting the occurrences of various strings in a file

Question 7) Which of the following lines of Python is equivalent to the following sequence of statements assuming that counts is a dictionary?

if key in counts:
counts[key] = counts[key] + 1
else:
counts[key] = 1

• counts[key] = (key in counts) + 1
• counts[key] = (counts[key] * 1) + 1
• counts[key] = key + 1
• counts[key] = counts.get(key,0) + 1
• counts[key] = counts.get(key,-1) + 1

Question 8) In the following Python, what does the for loop iterate through?

x = dict() 
... 
for y in x :

• It loops through the values in the dictionary
• It loops through all of the dictionaries in the program
• It loops through the keys in the dictionary
• It loops through the integers in the range from zero through the length of the dictionary

Question 9) Which method in a dictionary object gives you a list of the values in the dictionary?

• all()
• keys()
• each()
• values()
• items()

Question 10) What is the purpose of the second parameter of the get() method for Python dictionaries?

• The value to retrieve
• The key to retrieve
• To provide a default value if the key is not found
• An alternate key to use if the first key cannot be found