Step 1: Don't use threads for parallelism Threads are a reasonable structuring tool for expressing concurrency, which is useful for laying out your code in a m

Step 1: Don't use threads for parallelism Threads are a reasonable structuring tool for expressing concurrency, which is useful for laying out your code in a maintainable, easy-to-reason-about way. Mainstream Python implementations have concurrency but really do not have parallelism.