[Tutor] Question about sorting a list within a dictionary within a list
ian.douglas at iandouglas.com
Mon Aug 1 19:48:44 CEST 2011
I'm using the Bono library for talking to EC2, and I'm getting a list of
EC2 instances back in a list called "reservations". Each element in the
list is a dictionary of information. One of those dictionary elements is
a list called 'instances', and I only ever care about the first entry.
That instances value is a dictionary, which holds a key I want to use
to sort the base "reservations" list.
I found this helpful bit for sorting a list of dictionaries by a key
within the dictionaries:
... this works great if you just have a list of dictionaries. I'm not
sure how to go deeper within that to sort my data without iterating
through the entire 'reservations' list and building an entirely new
list. Maybe it would be easier, but I'm just curious if it's possible
without messing with my main 'reservations' list.
My current code looks like this: (it's a views.py file)
from django.http import HttpResponse
from operator import itemgetter
conn = boto.connect_ec2()
reservations = conn.get_all_instances()
# this is where I'm trying to sort everything
res_sorted = sorted(reservations, key=itemgetter('launch_time'))
output = '<table>'
output += '<tr>'
output += '<th>State</th>'
output += '<th>Launched</th>'
output += '<th>Public Hostname</th>'
output += '<th>Public IP</th>'
output += '<th>Private Hostname</th>'
output += '<th>Private IP</th>'
output += '</tr>'
for reservation in res_sorted:
instance = reservation.instances
output += '<tr>'
output += '<td>' + instance.state + '</td>'
output += '<td>' + instance.launch_time + '</td>'
output += '<td>' + instance.public_dns_name + '</td>'
output += '<td>' + instance.ip_address + '</td>'
output += '<td>' + instance.private_dns_name + '</td>'
output += '<td>' + instance.private_ip_address + '</td>'
Ideally, I'd like to make each table column 'sortable' so the user can
click on state/launched/etc (I may add more columns in the future), but
I'm not sure how to search deeper within the 'reservations' list for the
sorted() call to get at the 'launch_time' element within the instaces
Also, I'm sure there are much better ways to do the display logic, but
I'll tackle that another time.
Thanks for any pointers,
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