"""Demonstration of zipfile.ZipFile.close bug."""

import io
from zipfile import ZipFile

bytes_io = io.BytesIO()
zip_file = ZipFile(bytes_io, mode="w")
bytes_io.close()
zip_file.close()

"""
Traceback (most recent call last):
  File "/Users/jeff/sandbox/src/python3.7/build/master/../../poc/zipfile_close_bug.py", line 9, in <module>
    zip_file.close()
  File "/Users/jeff/sandbox/src/python3.7/cpython/Lib/zipfile.py", line 1829, in close
    self.fp.seek(self.start_dir)
ValueError: I/O operation on closed file.
"""