How can you retrieve a value from a dictionary?

• A. By using the value in square brackets
• B. By using the key in square brackets
• C. By using the dictionary method 'get'
• D. By using the indexing method only

Answer: (B)

Retrieving a value from a dictionary in Python is done using the key associated with that value. When you access a dictionary using square brackets, you must provide the key inside those brackets. The syntax looks like this: dictionary[key]. If the key exists in the dictionary, this returns the corresponding value.

Using the key in square brackets is a direct and commonly used method for accessing values in a dictionary. This approach is straightforward, and it works consistently as long as you use an existing key.

Other methods, such as the get method, are also valid for retrieving values from a dictionary, allowing for default behavior if the key does not exist. However, specifically focusing on the use of square brackets necessitates using a key.

It’s important to note that using values or employing indexing methods would not yield the correct results for dictionary access since dictionaries are based on key-value pairs rather than sequential indices or non-key-based approaches.