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Is output buffering enabled by default in Python's interpreter for sys.stdout?

If the answer is positive, what are all the ways to disable it?

Suggestions so far:

  1. Use the -u command line switch

  2. Wrap sys.stdout in an object that flushes after every write

  3. Set PYTHONUNBUFFERED env var

  4. sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

Is there any other way to set some global flag in sys/sys.stdout programmatically during execution?

1 Answer

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The buffering can be skipped for a whole python process by using "python -u" (or#!/usr/bin/env python -u etc) or you can set the environment variable PYTHONUNBUFFERED.

The sys.stdout can be replaced with some other streams like wrapper which does a flush after every call below is the code that explains how we use sys.stdout:-

class Unbuffered(object):

      def __init__(self, stream):

           self.stream = stream

      def write(self, data):

           self.stream.write(data)

           self.stream.flush()

      def writelines(self, datas):

           self.stream.writelines(datas)

           self.stream.flush()

      def __getattr__(self, attr):

           return getattr(self.stream, attr)

import sys

sys.stdout = Unbuffered(sys.stdout)

print('Hello')

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