Message394922
Since Python 3.9 tarfile.is_tarfile accepts not only paths but also files and file-like objects (bpo-29435).
Verification if a file or file-like object is a tar file modifies file object's current position.
Imagine a function listing names of all tar archive members but checking first if this is a valid tar archive. When its argument is a str or pathlib.Path this is quite straightforward. If the argument is a file of file-like object then current position must be reset or TarFile.getmembers() returns empty list.
import tarfile
def list_tar(archive):
if tarfile.is_tarfile(archive):
kwargs = {'fileobj' if hasattr(archive, 'read') else 'name': archive}
t = tarfile.open(**kwargs)
return [member.name for member in t.getmembers()]
return []
if __name__ == '__main__':
path = 'archive.tar.gz'
print(list_tar(path))
print(list_tar(open(path, 'rb')))
['spam.py', 'ham.py', 'bacon.py', 'eggs.py']
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Date |
User |
Action |
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2021-06-02 15:09:05 | mateja.and | set | recipients:
+ mateja.and |
2021-06-02 15:09:05 | mateja.and | set | messageid: <1622646545.23.0.614350359918.issue44289@roundup.psfhosted.org> |
2021-06-02 15:09:05 | mateja.and | link | issue44289 messages |
2021-06-02 15:09:05 | mateja.and | create | |
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