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import time
import sys
for i in range(0,100):
try:
# simulate calculation time
time.sleep(.1)
# output a line of gcode
print('G0 X1', file=sys.stdout)
# update progress
print('FILTER_PROGRESS={}'.format(i), file=sys.stderr)
except:
# This causes an error message
print('Error; But this was only a test', file=sys.stderr)
raise SystemExit(1)
print('M2', file=sys.stdout)
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