[Tutor] File mode tests

[Bill Campbell]

I'm just getting my feet wet with python after programming primarily in
perl since perl-3.something.  I've read the Harms and McDonald ``The Quick
Python Book'', and O'Reilly's ``Learning Python'', but haven't been able to
find python equivalents to these perl tests (lots of others in os.path, but
not these :-).

	if ( -x path ) # is is executable
	if ( -r path ) # is it readable
	if ( -w path ) # is it writeable

I would love to find documentation, something like ``python for the perl
hacker'' that would help in the transition.

Bill
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