小编use*_*980的帖子

我正在学习 Spring Boot。ApplicationRunner 或任何运行器接口的典型用例是什么？

import org.junit.jupiter.api.Test;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class PersistencedemoApplicationTests implements ApplicationRunner {

    @Test
    void contextLoads() {
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
       // load initial data in test DB
    }
}

这是我知道的一个案例。还要别的吗？

def heapify(A):
    for root in xrange(len(A)//2-1, -1, -1):
        rootVal = A[root]
        child = 2*root+1
        while child < len(A):
            if child+1 < len(A) and A[child] > A[child+1]:
                child += 1
            if rootVal <= A[child]:
                break
            A[child], A[(child-1)//2] = A[(child-1)//2], A[child]
            child = child *2 + 1

这是python heapq.heapify（）的类似实现。据说在文档中此函数在O（n）中运行。但是，对于n / 2个元素，它似乎执行log（n）操作。为什么是O（n）？

class DockerEngine(Device):

  def __init__(self):
      super(DockerInfo, self).__init__()
      self.docker_id = None
      self.host_ip_address = None
      self.total_containers = 0
      self.running_containers = 0
      self.paused_containers = 0
      self.stopped_containers = 0

  @property
  def host_ip_address(self):
      return self._host_ip_address

  @host_ip_address.setter
  def host_it_address(self, ip):
      self._host_ip_address = ip

  @property
  def docker_id(self):
      return self._docker_id

  @docker_id.setter
  def docker_id(self, id):
      self._docker_id = id

当我初始化一个 DockerEngine 对象时，它抱怨 in __init__ self.host_ip_address, can't set attribute。