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Issue #16304: Another performance optimization for BZ2File.

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Patch by Serhiy Storchaka.
This commit is contained in:
Nadeem Vawda 2012-10-01 23:02:50 +02:00
parent 4524b46733
commit 452add08a1
1 changed files with 3 additions and 6 deletions
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9
Lib/bz2.py
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@ -159,21 +159,18 @@ class BZ2File(io.BufferedIOBase):
raise ValueError("I/O operation on closed file")
def _check_can_read(self):
if self.closed:
raise ValueError("I/O operation on closed file")
if self._mode not in (_MODE_READ, _MODE_READ_EOF):
self._check_not_closed()
raise io.UnsupportedOperation("File not open for reading")
def _check_can_write(self):
if self.closed:
raise ValueError("I/O operation on closed file")
if self._mode != _MODE_WRITE:
self._check_not_closed()
raise io.UnsupportedOperation("File not open for writing")
def _check_can_seek(self):
if self.closed:
raise ValueError("I/O operation on closed file")
if self._mode not in (_MODE_READ, _MODE_READ_EOF):
self._check_not_closed()
raise io.UnsupportedOperation("Seeking is only supported "
"on files open for reading")
if not self._fp.seekable():