M101 Homework 2.2

本人写的第一个python程序：

# M101 Week2 - CRUD Homework 2.2
import pymongo
import sys# establish a connection to the database
connection = pymongo.Connection("mongodb://localhost", safe=True)
db = connection.students
grades = db.gradesdef hw2_2():for i in range(0, 200):query = {'type':'homework', 'student_id': i}selector = {'student_id':1, '_id':1, 'score':1}try:cursor = grades.find( query, selector )cursor = cursor.sort([('student_id',pymongo.ASCENDING),('score',pymongo.ASCENDING)])except:print "Unexpected error:", sys.exc_info()[0]raisefor hw in cursor:print "delete", hwgrades.remove(hw)breakhw2_2()

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