get function names from a list python

Question

I am trying to write a function that will print the values of a object but only those values that are defined in a list.

import boto.ec2.cloudwatch
conn = boto.ec2.cloudwatch.connect_to_region('ap-southeast-1')
alarms = conn.describe_alarms()
for alarm in alarms:
    print alarm.name

this will return a particular value for all alarms. How ever I want to make it work in such a way that I am able to print all the values that are defined in a list. Here is what I am trying to do

import boto.ec2.cloudwatch
conn = boto.ec2.cloudwatch.connect_to_region('ap-southeast-1')
alarms = conn.describe_alarms()
whitelist = ["name", "metric", "namespace"]
for alarm in alarms:
    print alarm.whitelist[0]

However this wont works of course. Any suggestion about what will be the best way to do that? SO that I am able to print everything that is defined in a whitelist.

jonrsharpe · Accepted Answer · 2014-07-10 10:57:06Z

2

You can use getattr (note that you are referring to attributes, or possibly methods, not functions):

for alarm in alarms:
    for attr in whitelist:
        print getattr(alarm, attr)

getattr takes an optional third argument, the default value in case attr isn't found, so you could do e.g.:

for attr in whitelist:
    print "{0}: {1}".format(attr, getattr(alarm, attr, "<Not defined>"))

answered Jul 10, 2014 at 10:57

jonrsharpe

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underyx · Accepted Answer · 2014-07-10 10:59:07Z

0

You can use the getattr() built-in function.

Your code would looks something like this:

import boto.ec2.cloudwatch
conn = boto.ec2.cloudwatch.connect_to_region('ap-southeast-1')
alarms = conn.describe_alarms()
whitelist = ["name", "metric", "namespace"]
for alarm in alarms:
    for attribute in whitelist:
        print(getattr(alarm, attribute))

answered Jul 10, 2014 at 10:59

underyx

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