Printing error messages (as opposed to diagnostic log messages) to the Standard Error stream (
sys.stderr) is a good habit. This is done by passing
[print](http://docs.python.org/library/functions.html#print)(). In Eclipse, the
sys.stderr messages are printed in a different color (red above) which is great to spot the error messages.
import sys print("Checking oxygen tank", i, "... FAIL!", file=sys.stderr)
Tried with: Python 3.2