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Message: [QUOTE="Dennis Lee Bieber, post: 5051033"] Confusion abounds... You don't have to "pickle file like object..." for it to be used by a Python THREAD... But your mention of pipes makes me think you are using subprocesses and/or multiprocessing modules. Threads run in a shared environment (you may need to put a lock around the file object so that only one thread at a time does the I/O on that object), but processes are independent memory spaces. However, you may also encounter OS specific behavior WRT stdout/stderr when they are connected to a console. The OS itself may block/buffer output when there is a pending input on the same console. [/QUOTE]