Rewind in the third-party decompressor test; wrap two long lines

Author: rasmusfaber

Lib/test/test_zipfile/test_core.py

@@ -4970,8 +4970,12 @@ def test_read_through_third_party_decompressor(self):
             self.assertEqual(zf.read("member"), data)
             with zf.open("member") as f:
                 self.assertEqual(f.read(100), data[:100])
+                self.assertEqual(f.read1(100), data[100:200])
                 f.seek(-100, os.SEEK_END)
                 self.assertEqual(f.read(), data[-100:])
+                # Rewinding past the read buffer re-creates the decompressor.
+                f.seek(0)
+                self.assertEqual(f.read(), data)
 
 
 class AbstractBadCrcTests:

Lib/zipfile/__init__.py

@@ -1204,7 +1204,8 @@ def read1(self, n):
 
     def _set_decompressor(self):
         self._decompressor = _get_decompressor(self._compress_type)
-        self._decompress_bounded = _decompressor_bounds_output(self._decompressor)
+        self._decompress_bounded = _decompressor_bounds_output(
+            self._decompressor)
 
     def _read1(self, n):
         # Read up to n compressed bytes with at most one read() system call,
@@ -1245,7 +1246,8 @@ def _read1(self, n):
             data = self._decompressor.decompress(data, max(n, self.MIN_READ_SIZE))
             self._eof = (self._decompressor.eof or
                          self._compress_left <= 0 and
-                         _decompressor_needs_input(self._decompressor, default=True))
+                         _decompressor_needs_input(self._decompressor,
+                                                   default=True))
         else:
             data = self._decompressor.decompress(data)
             self._eof = self._decompressor.eof or self._compress_left <= 0

Misc/NEWS.d/next/Library/2026-09-08-13-06-29.gh-issue-156002.vmOC8T.rst

@@ -1,5 +1,5 @@
 :mod:`zipfile` again reads members through a third-party decompressor
-installed by replacing ``_get_decompressor()``, unbounded as before the
-bounded-decompression fix, instead of raising :exc:`AttributeError`. The
-bound still applies to the standard library's bzip2, LZMA and Zstandard
-decompressors.
+installed by replacing the private ``_get_decompressor()``, unbounded as
+before the bounded-decompression fix, instead of raising
+:exc:`AttributeError`. The bound still applies to the standard library's
+bzip2, LZMA and Zstandard decompressors.