boto-python动态数据库扫描属性to_get

Question

各位，boto的文档充其量是模糊的，为什么这个操作不起作用？

from boto.dynamodb2.table import Table
import time
print "Scanning Existing Database"
myTable = Table('myTable')
start = time.clock()
my_query = myTable.scan(scan_filter=None, attributes_to_get=['something'])
results = []
for x in my_query:
    results.append(x['something'])
elapsed = (time.clock() - start)
print "Scan Operation took",elapsed
print len(results)

为什么这样做：

#!/bin/env python
import boto
db = boto.connect_dynamodb()
import time
print "Scanning Existing Database"
table = db.get_table('current_fhv_drivers')
start = time.clock()
all_query = table.scan(attributes_to_get=['something'])
results = []
for x in all_query:
    results.append(x['something'])
elapsed = (time.clock() - start)
print "Scan Operation took",elapsed
print len(results)

Answer 1

似乎您正在尝试在创建连接之前获取一个表。尝试：

import boto
import boto.dynamodb2
from boto.dynamodb2.table import Table
conn = boto.dynamodb2.connect_to_region(
    'us-east-1',
    aws_access_key_id=AWS_ACCESS_KEY_ID,
    aws_secret_access_key=AWS_SECRET_ACCESS_KEY
)
myTable = Table('myTable', connection=conn)

Answer 2

如果在.boto文件中正确设置了配置，则第一个代码示例必须有效。它适用于我的任务。