Pulling sub document from a document

The following code demonstrates the removing of sub document from a document using the pull command .

  1: import pymongo
  2: from datetime import *
  3: client = pymongo.MongoClient("localhost", 27017)
  4: 
  5: db = client['test-database']
  6: 
  7: userCollection = db['userCollection']
  8: 
  9: userCollection.remove ({"Name":"Uzi"} ,safe=True)
 10: 
 11: new_user = {"Name":"Uzi",
 12:     "Age":90,
 13:     "Childs":["fstChild","scnChild"],
 14:     "dateofbirth" : datetime(1970, 10, 25),
 15:     "email" : "loveme42@hotmail.com",
 16:     "RunningNo":nextNo ,
 17:     "Blog address":"http://zvikastechnologiesblog.blogspot.com",
 18:     "BankAcounts":[{"Name":"Leumi" ,"No":"123"},{"Name":"apoalim" ,"No":"456"}]}
 19: 
 20: userCollection.save (new_user)
 21: 
 22: userCollection.update({"Name":"Uzi"},
 23: {"$pull":{"BankAcounts":{"No":{"$ne":"123"}}}}, safe=True)
 24: 
 25: users = db.userCollection.find({"Name":"Uzi"},limit=1)
 26: 
 27: for user in users:
 28:     print ( type ( user))
 29:     print (  user)

And the result:
{'Age': 90, 'dateofbirth': datetime.datetime(1970, 10, 25, 0, 0), 'Blog address': 'http://zvikastechnologiesblog.blogspot.com', '_id': ObjectId('51b5c0fddef1c125e8218723'), 'RunningNo': 175, 'email': 'loveme42@hotmail.com', 'Name': 'Uzi', 'BankAcounts': [{'Name': 'Leumi', 'No': '123'}], 'Childs': ['fstChild', 'scnChild']}

The Mongo Query removes all the sub documents of docuemnts where the sub docuemnt "No" value is not equal to "123"
Note:There is a deiffrent between 123 and “123”.