Py2neo.Graph()连接Neo4j报错：ImportError: cannot import name ‘clock‘ from ‘time‘ (unknown location)

Posted 2021-09-15 ZSYL

ImportError: cannot import name 'clock' from 'time' unknown location

• 问题描述
• 原因分析
• time.clock()
• 解决方法

问题描述

使用py2neo连接Neo4j失败：

import py2neo

graph = py2neo.Graph('http://localhost:7474/browser/', auth=('neo4j', 'zs'))

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
D:\\Anaconda3\\lib\\site-packages\\py2neo\\database.py in __new__(cls, uri, **settings)
     87         try:
---> 88             inst = cls._instances[key]
     89         except KeyError:

KeyError: 'f4d319166f241a7521b0ef1d3fa91b66'

During handling of the above exception, another exception occurred:

ImportError                               Traceback (most recent call last)
~\\AppData\\Local\\Temp/ipykernel_12568/17468484.py in <module>
----> 1 graph = py2neo.Graph('http://localhost:7474/browser/', auth=('neo4j', 'zs'))

D:\\Anaconda3\\lib\\site-packages\\py2neo\\database.py in __new__(cls, uri, **settings)
    303     def __new__(cls, uri=None, **settings):
    304         name = settings.pop("name", "data")
--> 305         database = Database(uri, **settings)
    306         if name in database:
    307             inst = database[name]

D:\\Anaconda3\\lib\\site-packages\\py2neo\\database.py in __new__(cls, uri, **settings)
     90             inst = super(Database, cls).__new__(cls)
     91             inst._connection_data = connection_data
---> 92             from py2neo.internal.http import HTTPDriver, HTTPSDriver
     93             from neo4j.v1 import Driver
     94             inst._driver = Driver(connection_data["uri"],

D:\\Anaconda3\\lib\\site-packages\\py2neo\\internal\\http.py in <module>
     27 from neo4j.bolt import ServerInfo
     28 from neo4j.exceptions import AuthError, Forbidden
---> 29 from neo4j.v1 import Driver, Session, StatementResult, TransactionError, SessionError
     30 
     31 from py2neo.data import Record

D:\\Anaconda3\\lib\\site-packages\\neo4j\\v1\\__init__.py in <module>
     23 from .exceptions import *
     24 from .result import *
---> 25 from .routing import *
     26 from .security import *
     27 from .types import *

D:\\Anaconda3\\lib\\site-packages\\neo4j\\v1\\routing.py in <module>
     23 from sys import maxsize
     24 from threading import Lock
---> 25 from time import clock
     26 
     27 from neo4j.addressing import SocketAddress

ImportError: cannot import name 'clock' from 'time' (unknown location)

ImportError: cannot import name 'clock' from 'time' (unknown location)

原因分析

Python time模块的 clock() 方法在python3.3弃用，在python3.8中将被移除：

DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead

time.clock()

以浮点数计算的秒数返回当前的CPU时间，用来衡量不同程序的耗时，比time.time()更好用。

在Py3.3后不建议使用，Py3.8后移除，该方法依赖于操作系统，建议使用per_counter(返回系统运行时间) 或 process_time(返回进程运行时间)代替。

解决方法

回到原问题，那一定是降低Python版本或者重装Neo4j的高版本。

如下：

Neo4j3.5需要导入的包：

from sys import maxsize
from threading import Lock
from time import clock

在Anaconda中新建一个Python环境：

conda create -n envname python=3.7

之后安装py2neo即可！

参考：Link