[New-bugs-announce] [issue7862] fileio.c: ValueError vs. IOError with impossible operations

[Stefan Krah]

New submission from Stefan Krah <stefan-usenet at bytereef.org>:

I think that certain FileIO methods should raise IOError instead of
ValueError when a file operation is attempted with the wrong mode.
The methods of IOBase are documented to raise IOError in these situations.


>>> import io
>>> f = io.open("testfile", "w")
>>> f.read()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: not readable
>>> 
>>> f = io.FileIO("testfile", "w")
>>> f.read()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: File not open for reading

----------
components: IO
messages: 98909
nosy: pitrou, skrah, stutzbach
severity: normal
status: open
title: fileio.c: ValueError vs. IOError with impossible operations
type: behavior
versions: Python 2.7, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7862>
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