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Fix bpo-30526: Add TextIOWrapper.reconfigure() and a TextIOWrapper.write_through attribute (#1922)

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* Fix bpo-30526: Add TextIOWrapper.reconfigure()

* Apply Nick's improved wording

* Update Misc/NEWS
This commit is contained in:
Antoine Pitrou 2017-06-03 12:32:28 +02:00 • committed by GitHub
parent ae8750bca8
commit 3c2817b688
6 changed files with 190 additions and 2 deletions
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23
Lib/_pyio.py
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@ -1943,7 +1943,6 @@ class TextIOWrapper(TextIOBase):
raise ValueError("invalid errors: %r" % errors)
self._buffer = buffer
self._line_buffering = line_buffering
self._encoding = encoding
self._errors = errors
self._readuniversal = not newline
@ -1969,6 +1968,12 @@ class TextIOWrapper(TextIOBase):
# Sometimes the encoder doesn't exist
pass
self._configure(line_buffering, write_through)
def _configure(self, line_buffering=False, write_through=False):
self._line_buffering = line_buffering
self._write_through = write_through
# self._snapshot is either None, or a tuple (dec_flags, next_input)
# where dec_flags is the second (integer) item of the decoder state
# and next_input is the chunk of input bytes that comes next after the
@ -2007,10 +2012,26 @@ class TextIOWrapper(TextIOBase):
def line_buffering(self):
return self._line_buffering
@property
def write_through(self):
return self._write_through
@property
def buffer(self):
return self._buffer
def reconfigure(self, *, line_buffering=None, write_through=None):
"""Reconfigure the text stream with new parameters.
This also flushes the stream.
"""
if line_buffering is None:
line_buffering = self.line_buffering
if write_through is None:
write_through = self.write_through
self.flush()
self._configure(line_buffering, write_through)
def seekable(self):
if self.closed:
raise ValueError("I/O operation on closed file.")