How to Get Realtime Output from a Subprocess in Python?

Realtime Output from Subprocess

When executing command line programs using Python's subprocess module, developers often encounter the issue of buffered output. This can be problematic for tasks that require line-by-line processing.

To resolve this issue, users can consider the following approach:

• Utilize p.stdout.readline() within a while loop to read each line of output as soon as it becomes available. For example:

while True:
    line = p.stdout.readline()
    if not line: break  # No more output, exit loop

    # Process the current line as needed...

This method allows for real-time output processing without encountering buffering issues. Despite initial attempts with for line in p.stdout: and bufsize settings, this approach has been proven to effectively capture output in a timely manner.

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