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file_truncate(): C doesn't define what fflush(fp) does if fp is open
for update, and the preceding I/O operation on fp was input. On Windows,
fflush() actually changes the current file position then. Because
Windows doesn't support ftruncate() directly, this not only caused
Python's file.truncate() to change the file position (contra our docs),
it also caused the file not to change size.
Repaired by getting the initial file position at the start, restoring
it at the end, and tossing all the complicated micro-efficiency checks
trying to avoid "provably unnecessary" seeks. file.truncate() can't
be a frequent operation, and seeking to the current file position has
got to be cheap anyway.
Bugfix candidate.
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only. Repaired, and added new tests to test_file.py.
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ValueError when called for a closed file.
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imports of test modules now import from the test package. Other
related oddities are also fixed (like DeprecationWarning filters that
weren't specifying the full import part, etc.). Also did a general
code cleanup to remove all "from test.test_support import *"'s. Other
from...import *'s weren't changed.
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Add test for file.readinto().
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Test that the file methods raise ValueError when called on a closed file.
Test .isatty()
Test name, closed attributes
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message for bad mode argument -- so that it doesn't fail on Windows.
It's hack. We know that errno is set to 0 in this case on Windows, so
check for that specifically.
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If fopen() fails with EINVAL it means that the mode argument is
invalid. Return the mode in the error message instead of the
filename.
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and replaces them with a new API verify(). As a result the regression
suite will also perform its tests in optimization mode.
Written by Marc-Andre Lemburg. Copyright assigned to Guido van Rossum.
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to be extended somewhat -- right now it only tests the .writelines()
method.
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