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Chapter 10: Problem 7

Suppose a dictionary named inventory exists. What does the following statement do? del inventory[654]

Short Answer

Expert verified
Answer: The statement `del inventory[654]` removes the key-value pair with the key `654` from the `inventory` dictionary, if it exists. If the key `654` is not present in the dictionary, it will raise a KeyError, indicating that the specified key does not exist in the dictionary.

Step by step solution

01

Understanding a Dictionary

A dictionary in Python is a collection of key-value pairs, where each key is associated with a value. It is an unordered and mutable collection, meaning that the order of elements in a dictionary is not fixed, and it can be changed. Dictionaries are enclosed in curly brackets ({}), and elements are separated by commas. Here is an example of a dictionary: inventory = { 'apples': 5, 'oranges': 10, 'bananas': 3 } In this dictionary, the keys are 'apples', 'oranges', and 'bananas', and their respective values are 5, 10, and 3.
02

Using the `del` Statement

In Python, the `del` statement is used to remove an item from a dictionary. The general syntax for the `del` statement is as follows: del dictionary_name[key] To remove an item from a dictionary, you need to specify the key of the item you want to remove within the square brackets. The `del` statement will then remove the associated key-value pair from the dictionary.
03

Effect of the Given Statement

The given statement is: del inventory[654] This statement will remove the key-value pair with the key `654` from the `inventory` dictionary, if it exists. If the key `654` is not present in the dictionary, it will raise a KeyError, indicating that the specified key does not exist in the dictionary.

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Most popular questions from this chapter

Does a set allow you to store duplicate elements?

Look at the following code: set1 = set([1, 2, 3, 4]) set2 = set([2, 3]) Which of the sets is a subset of the other? Which of the sets is a superset of the other?

After the following code executes, what elements will be members of set3? set1 = set(['a', 'b', 'c']) set2 = set(['b', 'c', 'd']) set3 = set1.symmetric_difference(set2)

What will the following code display? stuff = {1 : 'aaa', 2 : 'bbb', 3 : 'ccc'} print(stuff[3])

What will the following code display? stuff = {1 : 'aaa', 2 : 'bbb', 3 : 'ccc'} print(len(stuff))
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