Dictionary in Python

A dictionary is 'like' a list.

• True

• False

In a dictionary, each key maps to a _____________.

How would you create an empty Dictionary? Select all that apply.

• a=dict()

• a={}

• a=dict[]

• a=dict

Curly braces {} represent a list, the same way square brackets [] represent a dictionary.

• True

• False

When you print a dictionary, the order of the key-value pairs may not be the same!

• True

• False

What would the len() function print in the following code?

a_dictionary={"a":1,"b":1,"c":1,"d":1,"e":5}

print(len(a_dictionary))

• 5

• 10

• Error

• None of these

What method in dictionaries takes a key and a default value?

• find()

• get()

• search()

• lookup()

What happens if you try to access a key that isn't in the dictionary?
For example:

a_dict = {"a":1,"b":2,"c":3}

print(a_dict["d"])

• It returns an empty string

• It returns the default value

• It returns nothing

• It raises an exception

a = {1:10,2:20,3:30,4:40,5:50}

print(a[1])

What does the above program print?

• 1

• 10

• (1,10)

• 20

What does the 'in' operator tell you about a key in a dictionary?

• Whether it appears as a key

• Whether it appears as a value

• Whether it appears as a key or value