Python tarfile module overwrites existing files during extraction - how to disable it?

Is there a way prevent tarfile.extractall (API) from overwriting existing files? By "p开发者_StackOverflow社区revent" I mean ideally raising an exception when an overwrite is about to happen. The current behavior is to silently overwrite the files.

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You could check result of tarfile.getnames against the existing files and raise your error.

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Have you tried setting tarfile.errorlevel to 2? That will cause non-fatal errors to be raised. I'm assuming an overwrite falls in that category.

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I have a similar situation, where I only want to extract if all the files have not yet already been extracted. I use the following function to check if archive has already been extracted to extract_dir:

from pathlib import Path
import tarfile

def is_extracted(archive, extract_dir):
    tar = tarfile.open(archive)
    filenames = tar.getnames()
    return all([(Path(extract_dir) / f).exists() for f in filenames])