When directory exists with a name chosen for new temporary file, OSError with EACCESS errno is thrown on windows, while attempts to chose another name only happen on EEXIST errors.


To reproduce, run
--------------- 8< -----------------
import sys
import tempfile
import os

print sys.platform
print sys.version

# Mock random names to ensure collision.
tempfile._RandomNameSequence = lambda: iter(['a', 'a', 'b'])

d = tempfile.mkdtemp()
print d

try:
    print tempfile.NamedTemporaryFile().name
finally:
    os.rmdir(d)
--------------- >8 -----------------


Expected result:
win32
2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)]
...\tmpa
...\tmpb


Actual result:
win32
2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)]
c:\users\shcher~1\appdata\local\temp\tmpa
Traceback (most recent call last):
  File "hz.py", line 13, in <module>
    print tempfile.NamedTemporaryFile().name
  File "C:\python_27_amd64\files\lib\tempfile.py", line 454, in NamedTemporaryFile
    (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
  File "C:\python_27_amd64\files\lib\tempfile.py", line 235, in _mkstemp_inner
    fd = _os.open(file, flags, 0600)
OSError: [Errno 13] Permission denied: 'c:\\users\\shcher~1\\appdata\\local\\temp\\tmpa'