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Why Does Buffered Output Prevent Immediate Printing in Python?

Patricia Arquette
Patricia ArquetteOriginal
2024-11-10 15:45:03760browse

Why Does Buffered Output Prevent Immediate Printing in Python?

Why Buffered Output Hinders Inline Printing in Python

The Issue

Python typically buffers output to enhance efficiency. However, this leads to print statements not being displayed immediately when there is no newline appended. The output is held back and released only when a newline is encountered.

Fixing the Issue

Single Print:

  • In Python 3.x, use the flush=True argument with print.

    for _ in range(10):
        print('.', end=' ', flush=True)
  • In Python 2.x, flush the standard output stream manually.

    for _ in range(10):
        print '.'
        sys.stdout.flush()

Multiple Prints:

  • Disable output line buffering altogether using methods discussed in the linked question.

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