python raise and exit code example

Example 1: python raise error exit

# There are 3 approaches, the first as lvc mentioned is using sys.exit
sys.exit('My error message')

# The second way is using print, print can write almost anything including an error message
print >>sys.stderr, "fatal error"     # Python 2.x
print("fatal error", file=sys.stderr) # Python 3.x

# The third way is to rise an exception which I don't like because it can be try-catch
raise SystemExit('error in code want to exit')

# it can be ignored like this
try:
  raise SystemExit('error in code want to exit')
except:
  print("program is still open")

Example 2: python raise and exit

def main():    
    try:
       create_logdir()
       create_dataset()
       unittest.main()    
    except Exception as e:
       logging.exception(e)
       raise SystemExit

if __name__ == '__main__':    
    main()