Chapter 9: Problem 4

Suppose a dictionary named employee has been created. What does the following statement do? employee['id'] = 54321

Short Answer

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Answer: The statement "employee['id'] = 54321" adds or updates a key-value pair in the 'employee' dictionary where the key is 'id' and the value is 54321. If the key 'id' already exists in the dictionary, its value will be updated to 54321. If the key 'id' is not present, a new key-value pair ('id', 54321) will be added to the dictionary.

Step by step solution

Understanding Dictionaries in Python

A dictionary in Python is a collection of key-value pairs. Each key in the dictionary must be unique and is used to access the corresponding value. Dictionaries are created using curly braces {} and key-value pairs are separated by a colon. Dictionaries can be modified by adding or updating key-value pairs.

Creating a Dictionary

To create a dictionary named 'employee', you can define it like this: employee = {}. The dictionary is now empty and ready to store key-value pairs.

Adding or Updating Key-Value Pairs

To add or update a key-value pair in a dictionary, you use the syntax: dictionary_name[key] = value. In this exercise, the given statement is: employee['id'] = 54321

What Does the Statement Do?

The statement employee['id'] = 54321 adds a key-value pair to the 'employee' dictionary where the key is 'id' and the value is 54321. If the key 'id' is already present in the dictionary, this statement will update its value to 54321. If the key 'id' is not present, it will add a new key-value pair ('id', 54321) to the dictionary.

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Suppose a dictionary named employee has been created. What does the following statement do? employee['id'] = 54321

Short Answer

Step by step solution

Understanding Dictionaries in Python

Creating a Dictionary

Adding or Updating Key-Value Pairs

What Does the Statement Do?

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