How Can I Get Immediate Output from Python's Print Function?

Immediate Output from Python's Print Function

Python's print function defaults to buffering output, meaning that printed text is not immediately displayed on the screen. This can be problematic when you want immediate feedback or when you want to interact with the user while printing.

Python 3 offers a simple solution:

Use the flush Argument

Python 3 introduced the optional flush argument for the print function. By setting flush to True, you can force the output buffer to be flushed immediately, ensuring that the printed text appears on the screen right away.

print("Hello, World!", flush=True)

Python 2

In Python 2, there is no built-in way to flush print output immediately. However, you can manually flush the output buffer using the following steps:

1. Import the sys module.
2. Call sys.stdout.flush().

import sys
print("Hello, World!")
sys.stdout.flush()

Caveats

• The flush argument is only available in Python 3 and later.
• If you disable output buffering altogether, all print statements will be flushed immediately, which may not be desirable in all cases.
• Flushing too often can slow down performance, especially when printing large amounts of data.

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