Question

我正在尝试按照以下关于写路径的视频，当我使用提供的示例学生文件时，我得到以下错误....我是cassandra的新手，并试图找出为什么excerise文件不工作....我提供了我得到的错误（ImportError：没有名为cassandra.cluster的模块）以及.sh和.py文件...任何帮助都是适用的...

https://academy.datastax.com/courses/understanding-cassandra-write-path/understanding-data-files

    cass@cass:~/student-files/write-path/exercise-1$ ccm list
 *demo_1node
cass@cass:~/student-files/write-path/exercise-1$
cass@cass:~/student-files/write-path/exercise-1$ ccm status
Cluster: 'demo_1node'
---------------------
node1: UP
cass@cass:~/student-files/write-path/exercise-1$
cass@cass:~/student-files/write-path/exercise-1$ ./write_data.sh 300000
Traceback (most recent call last):
  File "./write_data.py", line 5, in <module>
    from cassandra.cluster import Cluster
ImportError: No module named cassandra.cluster
cass@cass:~/student-files/write-path/exercise-1$

cass@cass:~/student-files/write-path/exercise-1$ cat write_data.sh
#!/bin/bash

if [ $# -ne 1 ]; then
  echo "Usage: write_data.sh <number of keys>"
  exit 0
fi

if [ `ccm status | grep "node1: UP" | wc -l` -ne 1 ]; then
  echo "Cassandra cluster not up"
  exit 0
fi

./write_data.py $1
cass@cass:~/student-files/write-path/exercise-1$
cass@cass:~/student-files/write-path/exercise-1$ cat write_data.py
#!/usr/bin/python

# This Python script will insert a number of keys into
# musicdb.user
from cassandra.cluster import Cluster
from random import randint
from sets import Set
from uuid import uuid4
import os,sys,time,binascii

if len(sys.argv) < 2:
    print "Usage: python.py <number of keys>"
    sys.exit()

cluster = Cluster(['127.0.0.1'])
session = cluster.connect()

insert_row_prepare = session.prepare("INSERT INTO musicdb.user (id,preferences) VALUES(?,?)")

quarter=int(int(sys.argv[1])/4)
half=int(int(sys.argv[1])/2)
three_quarter=int(int(sys.argv[1])/4)+int(int(sys.argv[1])/2)

for x in range(0,int(sys.argv[1])):
  id = uuid4()
  set = Set([binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),
             binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),
             binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),
             binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100)),binascii.b2a_hex(os.urandom(100))])
  insert_row_bind = insert_row_prepare.bind([id,set])
  session.execute(insert_row_bind)

  if (x+1) == int(sys.argv[1]):
    print "100% completed - " + str(x+1) + " rows inserted."
  elif (x+1) == quarter:
    print "25% completed - " + str(x+1) + " rows inserted."
  elif (x+1) == half:
    print "50% completed - " + str(x+1) + " rows inserted."
  elif (x+1) == three_quarter:
    print "75% completed - " + str(x+1) + " rows inserted."

time.sleep(1)
cluster.shutdown()
cass@cass:~/student-files/write-path/exercise-1$

Answer 1

安装cassandra驱动程序：

pip install cassandra-driver

Answer 2

我也遇到同样的问题。当我看到答案时，我意识到我可能已经安装了适用于Python 2的驱动程序。我尝试了以下操作，现在可以使用了：

pip3 install cassandra-driver

由于Python 2和Python 3如此不兼容，因此python开发人员确实对noobs造成了困难。

Answer 3

您需要安装python驱动程序。

error ... ImportError：没有名为cassandra.cluster的模块

3 个答案: