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It doesn't run:

C:\py23\Lib\test>python_d test_mmap.py
Traceback (most recent call last):
  File "test_mmap.py", line 357, in ?
    test_main()
  File "test_mmap.py", line 353, in test_main
    test_offset()
  File "test_mmap.py", line 37, in test_offset
    m = mmap.mmap(f.fileno(), mapsize - PAGESIZE, 
offset=PAGESIZE)
TypeError: 'offset' is an invalid keyword argument for this 
function
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