Python safeguards

• Never create a resource with open() or with open() inside run method of a worker thread. Create a resource in the main thread and pass the reference to the resource to the worker instead.
• with open() is better than open() for writers because it closes the writer automatically when the control exits its scope. This flushes all write buffer to the disk.
• If open() is used for write(), explicitly call f.close() or f.flush() as you would normally do in Java.

Do away with System.out.println and Logger.info and your code now runs really faster!

I wrote a 10-threaded script last evening and was astounded to note that the performance hadn't really improved as I had expected. I knew for sure that I had parallelized all computation to get that 10x boost in speed from my initial single-threaded code and I was struck by this weird idea that 'sysout' and Logger.info were to blame. 

My good friend told me that if I were printing feedback out to the console on every single operation, that was a good reason why my code didn't perform as had been anticipated initially. I removed all those statements and bang! the code now run smooth and fast.