python归替RuntimeError是什么错误?，pythonruntimeerror,class START:

python归替RuntimeError是什么错误?，pythonruntimeerror,class START:

class START:    def main(self):    for num in xrange(1,10):    print num    self.main() if __name__ == "__main__":   START().main()

这段代码为什么执行起来会出现：
RuntimeError: maximum recursion depth exceeded while calling a Python object

#define Py_DEFAULT_RECURSION_LIMIT 1000

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