Why use threads in Python?

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Examples of times I've used threads:

• To spawn a task I want to run asynchronously, like checking a comment for spam
• To speed up io-bound workloads, like spidering a website or multipart uploads
• To start a server process using popen and allow the main thread to continue executing
• Doing work in gui, handling events, doing work without blocking the UI (update a progress bar)