boto python dynamodb扫描attribute_to_get [英] boto python dynamodb scan attributes_to_get

问题描述

伙计们，
boto的文档充其量是模糊的，为什么这个操作不起作用？

Folks, The docs for boto are vague at best, why is this operation not working?

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)

推荐答案

如果正确设置配置，第一个代码示例必须可以工作在.boto文件中。
适用于我的任务。

First code example must work if you properly set configs in .boto file. It works for my tasks.

这篇关于boto python dynamodb扫描attribute_to_get的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！