How Does Python Handle File Flushing, Especially When Redirecting Stdout?

Understanding File Flushing Behavior in Python

Python's file handling mechanism plays a crucial role in data output, and its flushing behavior can significantly impact the transfer of data to files.

1. File Flush Frequency in Python:

Python's file flushing strategy relies on the underlying operating system's default buffering settings. This means that unless explicitly specified, Python utilizes the system's preferred buffer size and flush interval. Typically, the operating system employs line buffering for interactive devices (such as terminals) and full buffering for regular files.

2. Impact of Stdout Redirection on Flush Frequency:

When stdout is redirected to a file, Python's flush behavior for this specific file remains unchanged. It continues to follow the default system buffering settings or any custom configuration provided when opening the file. Therefore, it's not necessarily true that Python flushes to stdout after every new line when stdout is redirected to a file. The flush interval depends on the configured buffer size or the system's default buffering policy.

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