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There's a mistake in the example given for os.walk on
this page:
 http://docs.python.org/lib/os-file-dir.html
The line with sum should read
 print sum([getsize(join(root, name)) for name in files]),
with square brackets. Otherwise, thanks for the
excellent documentation!

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Your URL is for the Python 2.4.2 docs, where the example 
works fine as given. If you're using an earlier version of 
Python, the example will not work as given (it relies on 
generator expressions, which were introduced in 2.4).
For example, if you're using Python 2.3.5, you should look at 
the docs for 2.3 instead:
http://www.python.org/doc/2.3.5/lib/os-file-dir.html
Note that square brackets _are_ in that example, because 
Python 2.3.5 required them. Current Pythons (2.4+) do not, 
so I'm closing this as Not-A-Bug.

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Ups, I'm sorry for the noise then...