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The documentation page 
http://docs.python.org/release/2.6.6/library/functions.html?highlight=open#open
describes the open() built-in function as
 open(filename[, mode[, bufsize]])
but the Python interpreter complains:
 Python 2.6.6 (r266:84292, Dec 27 2010, 00:02:40) 
 [GCC 4.4.5] on linux2 
 Type "help", "copyright", "credits" or "license" for more information.
 >>> 
 >>> 
 >>> file_descriptor = open(filename='/spam')
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 TypeError: Required argument 'name' (pos 1) not found
 >>> 
 >>> 
 >>> file_descriptor = open(name='/spam', bufsize=-1)
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 TypeError: 'bufsize' is an invalid keyword argument for this function
 >>> 
 >>> 
 >>> file_descriptor = open(name='/spam', buffering=-1)
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 IOError: [Errno 2] No such file or directory: '/spam'
 >>> _
 
So the documentation page should read
 open(name[, mode[, buffering]])
 ---- ---------
instead, note 'name' not 'filename' and 'buffering' not 'bufsize'.
Maybe it's relevant, because Debian/stable still ships with
Python 2.6.6 and I guess the Python 2.7.x documentation has 
the same bug.
The """docstring""" does already reflect that correctly.
PS:
This is my first bug report. I hope I did this right. 
Mercy, please! ;)