print "WARNING: a file named a.out exists, and getting the version of the 'as' assembler writes to that filename, so I'm not attempting to get the version of 'as'."
return
if os.path.exists('a.out'):
print "WARNING: a file named a.out exists, and getting the version of the 'as' assembler writes to that filename, so I'm not attempting to get the version of 'as'."