Instruction: Describe the purpose and use of Flask's global `g` object.
Context: This question probes the candidate's understanding of Flask's `g` object, used for storing and sharing data during an application context.
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The g object in Flask is essentially a global namespace for holding any data you want to share across functions during a single app context or request cycle. It's a temporary storage that is accessible within the context of an application request. This means that the data stored in the g object is available and persists for the duration of a request, but once the request is over, the data is cleared. This feature is particularly useful for storing data that is needed by multiple functions during the request's lifecycle, without needing to pass the data around explicitly.
One practical...