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我试图跟随this neo4j教程，我遇到连接到API的问题。这里是我的回溯：python py2neo SocketError：拒绝连接
>>> graph.delete_all()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 748, in delete_all
statement = StartOrMatch(self).relationship("r", "*").string + "DELETE r"
File "/usr/local/lib/python2.7/site-packages/py2neo/cypher/util.py", line 45, in string
if self.graph.supports_start_clause:
File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 1105, in supports_start_clause
return self.neo4j_version < (2, 2)
File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 964, in neo4j_version
return version_tuple(self.resource.metadata["neo4j_version"])
File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 213, in metadata
self.get()
File "/usr/local/lib/python2.7/site-packages/py2neo/core.py", line 258, in get
response = self.__base.get(headers=headers, redirect_limit=redirect_limit, **kwargs)
File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 966, in get
return self.__get_or_head("GET", if_modified_since, headers, redirect_limit, **kwargs)
File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 943, in __get_or_head
return rq.submit(redirect_limit=redirect_limit, **kwargs)
File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 433, in submit
http, rs = submit(self.method, uri, self.body, self.headers)
File "/usr/local/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 362, in submit
raise SocketError(code, description, host_port=uri.host_port)
py2neo.packages.httpstream.http.SocketError: Connection refused
我是新来的网络/套接字连接，所以这是怎么回事的人类可读的解释是非常有帮助的。