title: Insert the $currentDate on mongodb with pymongo
body: <p>I need test the accuracy of a server mongodb.
  I am trying to insert a sequence of data, take the moment and it was sent to the database to know when it was inserted. I'm trying this:</p>
  
  <pre><code>#!/usr/bin/python
  from pymongo import Connection
  from datetime import date, timedelta, datetime
  
  class FilterData:
  
  @classmethod
  def setData(self, serialData):
      try:
          con = Connection('IP_REMOTE', 27017, safe=True)
          db = con['resposta']            
          inoshare = db.resposta
          inoshare.insert(serialData)            
          con.close()
  
      except  Exception as e:
          print "Erro no filter data: ", e.message, e.args
  
  obj = FilterData()
  inicio = datetime.now()
  termino = inicio + timedelta(seconds=10)
  contador = 1
  
  while inicio &lt;= termino:
      print contador, inicio.strftime('%d-%m-%Y %H:%M:%S')
      pacote = {'contador':contador, 'datahora':$currentDate()}
      obj.setData(pacote)
      contador += 1
  </code></pre>
  
  <p>But the variables of mongodb (using $) are not recognized in python. How to proceed to accomplish this integration?</p>
  
  <p><strong>Obs: IP_REMOTE = my valid IP on REMOTE server</strong></p>
  
  <p>then tried the following, but only inserts a single record.</p>
  
  <pre><code>#!/usr/bin/python
  from pymongo import Connection
  from datetime import date, timedelta, datetime
  import time
  
  class FilterData:
  
      def __init__(self):
          self.con = Connection('54.68.148.224', 27017, safe=True)
          self.db = self.con['resposta']            
          self.inoshare = self.db.resposta
  
      def setData(self, serialData):
          try:
  
              self.inoshare.update({}, serialData, upsert=True)            
  
          except  Exception as e:
              print "Erro no filter data: ", e.message, e.args
  
      def desconect(self):
          self.con.close()
  
  obj = FilterData()
  inicio = datetime.now()
  termino = inicio + timedelta(seconds=30)
  
  while inicio &lt;= termino:
      print inicio.strftime('%d-%m-%Y %H:%M:%S')
      pacote = {'$currentDate': {'datahora': { '$type': 'date' }}}
      obj.setData(pacote)
      inicio = datetime.now()
      time.sleep(1)
  
  obj.desconect()
  </code></pre>