New submission from minstrelofc <minstrel...@gmail.com>:
Attempting to iterate over an opened gzip file raises a ValueError: readline of closed file Behavior in Python 3.9.7: Python 3.9.7 (default, Oct 13 2021, 09:08:19) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import gzip >>> ll = [l for l in gzip.GzipFile(filename='data/UTF-8-test_for_gzip.txt.gz')] >>> len(ll) 300 Behavior in Python 3.10.0 (and 3.11.0a1 is the same): Python 3.10.0 (default, Oct 13 2021, 08:53:15) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import gzip >>> ll = [l for l in gzip.GzipFile(filename='data/UTF-8-test_for_gzip.txt.gz')] Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 1, in <listcomp> ValueError: readline of closed file This only happens when iterating directly over the GzipFile object. Using a with: statement has the correct behaviour in both 3.10 and 3.11: >>> with gzip.GzipFile(filename='UTF-8-test_for_gzip.txt.gz') as input_file: ... len(list(input_file)) ... 300 ---------- files: UTF-8-test_for_gzip.txt.gz messages: 403948 nosy: minstrelofc priority: normal severity: normal status: open title: gzip fails to read a gzipped file (ValueError: readline of closed file) type: behavior versions: Python 3.10, Python 3.11 Added file: https://bugs.python.org/file50358/UTF-8-test_for_gzip.txt.gz _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue45475> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
