homepage

With Python 2.7 on Windows the following crashes with an assertion:
 >>> import os
 [43042 refs]
 >>> f = open("foobar", "wb")
 [43048 refs]
 >>> os.close(f.fileno())
 [43048 refs]
 >>> f.close()
 <Failed assertion>
A box pops up with
 Program: C:\Repos\cpython-27\PCbuild\python_d.exe
 File: f:\dd\vctools\crt_bld\self_x86\crt\src\close.c
 Line: 48
 Expression: (_osfile(fh) & FOPEN)
Python 3.2 and 3.3 give IOError(EBADF, ...) as expected.
Compare #15261 and #15263.

Is it also the case for other file operations? Here is a list that may use a closed FILE object:
 f.write('something')
 f.read(1)
 print >>f, 'something'
 f.seek(0)
 f.tell()
 f.truncate(0)
 f.flush()
 f.isatty()
 f.readlines()
 f.writelines(['x'])
 list(f)

If buffering is off then they all fail the assertion except isatty().

Python 2 is EOL.