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Use names SEEK_SET, etc instead of magic number (GH-12057)

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The previous code hardcoded `SEEK_SET`, etc. While it's very unlikely
that these values will change, it's best to use the definitions to avoid
there being mismatches in behavior with the code in the future.

Signed-off-by: Enji Cooper <yaneurabeya@gmail.com>
This commit is contained in:
ngie-eign 2019-03-02 23:28:26 -08:00 • committed by Inada Naoki
parent 8589f14bbe
commit 848037c147
2 changed files with 11 additions and 9 deletions
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6
Lib/_pyio.py
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@ -2386,18 +2386,18 @@ class TextIOWrapper(TextIOBase):
raise ValueError("tell on closed file")
if not self._seekable:
raise UnsupportedOperation("underlying stream is not seekable")
if whence == 1: # seek relative to current position
if whence == SEEK_CUR:
if cookie != 0:
raise UnsupportedOperation("can't do nonzero cur-relative seeks")
# Seeking to the current position should attempt to
# sync the underlying buffer with the current position.
whence = 0
cookie = self.tell()
if whence == 2: # seek relative to end of file
elif whence == SEEK_END:
if cookie != 0:
raise UnsupportedOperation("can't do nonzero end-relative seeks")
self.flush()
position = self.buffer.seek(0, 2)
position = self.buffer.seek(0, whence)
self._set_decoded_chars('')
self._snapshot = None
if self._decoder: