Difference between revisions of "Sort"

Revision as of 13:37, 27 July 2015

#ENCODING
import io
import sys
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-16')
#MONGO
from pymongo import MongoClient
client = MongoClient()
client.progzoo.authenticate('scott','tiger')
db = client['progzoo']
#PRETTY
import pprint
pp = pprint.PrettyPrinter(indent=4)
#CODE
from bson.code import Code

Top Tips

Find

sort() is a cursor method that orders the results of a query.
The aggregation framework provides the $sort operator, and map_reduce takes sort as a parameter that is applied to the input documents.

The syntax for sort() is sort(<field>:<value>) where 1 indicates ascending and -1 indicates descending.
The order in which fields are specified dictates which fields are sorted first.

Sort all the documents in world by population descending, then name ascending.

for x in list(db.world.find().sort({"population":-1,"name":1})):
    print(x)

@@ Line 25: / Line 25: @@
 <div class=q data-lang="py3">Sort all the documents in world by population descending, then name ascending.
 <pre class=def>
-for x in db.world.find().sort({"population":-1,"name":1}):
+for x in list(db.world.find().sort({"population":-1,"name":1})):
      print(x)
 </pre>
 </div>