Part III: Containers

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You can take this set of MCQs as many times as you like. No personal information is collected.

Dictionary values can be any data type. Suppose I create a dictionary member whose value that is a list e.g. my_dict['my_key'] = [1, 2, 3, 4]. How would I retrieve the value of the second member from the list?

5 points

my_dict[1]

my_dict[2]

my_dict['my_key'][1]

my_dict['my_key'][2]

You are writing a program that requires you to always insert new members at the beginning of a list. Which method is the best for this?

5 points

insert(0, value)

This is impossible! I give up!

append()

prepend()

You have just added the fifth member of dictionary but would like to now remove it. However, you have somehow forgotten the key! Which dictionary method below will guarantee to do this?

5 points

remove()

pop()

This is impossible! I give up!

popitem()

You would like to create a simple phone book. Which is the best container to use for such an application?

5 points

list

This is not possible

map

dictionary

You have a list containing each letter of the word ‘cat’ i.e. ['c', 'a', 't']. You multiply this list by 3. What do you get?

5 points

['cat', 'cat', 'cat']

[['c', 'a', 't'], ['c', 'a', 't'], ['c', 'a', 't']]

['c', 'a', 't'], ['c', 'a', 't'], ['c', 'a', 't']

['c', 'a', 't', 'c', 'a', 't', 'c', 'a', 't']

Consider a list with ten distinct integers. In playing around with our list we accidentally used a negative index e.g. -1 and are surprised to find that it works. Why?

5 points

You can use negative indices to refer to the list members in reverse beginning at the end. -1 means the last member and -(length) means the first member.

There must be a bug in that code. This cannot work.

While it seems to work the result is actually gibberish because we are referring to random blocks of memory.

Python automatically converts indices into absolute integers, which is why this works.

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