[Python]How to handle the exception in Python?

This post demonstrates how to use try clause to handle the exceptions

def test_exception(case=None):
	print case
	try:
		if case is None:
			raise ValueError("there is no value")
		elif case == 1:
			raise ImportError("can not import the module")
		else:
			raise MyException("this is the special error")
	except MyException as e:
		print e
		print "this is my exception"
	except ValueError as e:
		print e
		print "this is value error"
	except Exception as e:
		print "this is exception "

class MyException(Exception):
	pass

if __name__ == "__main__":
	#test_exception()
	test_exception(1)