title: AttributeError: module 'urllib3' has no attribute 'urlopen' in python
body: <p>I am trying to send temperature data over onto one of my website currently online. This code consists of measuring the temperature through a sensor(ds18b20), sending that data onto a mysql databse entitled temp_pi and specifically onto a table intitled TAB_CLASSROOM and lastly sending that data onto a webpage of mine. Everything in this code runs except for the <code>sendDataToServer()</code> part. I specify the error right before this particular line. I have the PHP set up on my website for this to work.</p>
  
  <pre><code>import os
  import glob
  import time
  import MySQLdb
  import datetime
  import mysql.connector
  from mysql.connector import Error
  
  #define db and cur
  
  db = MySQLdb.connect(host = "127.0.0.1", user = "root", passwd = "xB7O4fXmuMpF6M0u", db = "temp_pi")
  cur = db.cursor()
  
  #connection to the database
  try:
      connection = mysql.connector.connect(host='127.0.0.1',
                               database='temp_pi',
                               user='root',
                               password='xB7O4fXmuMpF6M0u')
  
      if connection.is_connected():
         db_Info = connection.get_server_info()
         print("Connected to MySQL database... MySQL Server version on ",db_Info)
         cursor = connection.cursor()
         cursor.execute("select database();")
         record = cursor.fetchone()
         print ("Your connected to - ", record)
  
  except Error as e :
      print ("Error while connecting to MySQL", e)
  
  #obtaining the temperature through the ds18b20 sensor            
  os.system('modprobe w1-gpio')
  os.system('modprobe w1-therm')
  
  base_dir = '/sys/bus/w1/devices/'
  device_folder = glob.glob(base_dir + '28*')[0]
  device_file = device_folder + '/w1_slave'
  
  def read_temp_raw():
      f = open(device_file, 'r')
      lines = f.readlines()
      f.close()
      return lines
  
  def read_temp():
      lines = read_temp_raw()
      while lines[0].strip()[-3:] != 'YES':
          time.sleep(0.2)
          lines = read_temp_raw()
      equals_pos = lines[1].find('t=')
      if equals_pos != -1:
          temp_string = lines[1][equals_pos+2:]
          temp_c = float(temp_string) / 1000.0
          temp_f = temp_c * 9.0 / 5.0 + 32.0
          return temp_c  
  #Defining sendDataToServer() and trying to send this data towards my website
  def sendDataToServer():
      global temperature
  
      threading.Timer(600,sendDataToServer).start()
      print("Mesuring...")
      read_temp()
      temperature = read_temp()
      print(temperature)
      temp= read_temp()
      urllib3.urlopen("http://francoouesttemp.tech/weather/add_data.php?temp="+temp).read()
  #insertion of data into the mysql database
  while True:
          print("putting temperature data into temp_pi database")
          i = datetime.datetime.now()
          year = str(i.year)
          month = str(i.month)
          day = str(i.day)
          date = day + "-" + month + "-" + year
  
          hour = str(i.hour)
          minute = str(i.minute)
          second = str(i.second)
          timestr = hour + ":" + minute + ":" + second
  
          valT = str(read_temp())
  
          try:
              cur.execute("""INSERT INTO TAB_CLASSROOM(temp_c,T_Date,T_Time) VALUES(%s,%s,%s)""",(valT,i,timestr))
              db.commit()
          except:
              db.rollback()
  
          time.sleep(5)
  
          #this is the part where my code tells me : NameError : name 'urllib3' is not defined ----- I want this part of the code to send the temperature, date and time over to my website.     
          sendDataToServer()
  
  cur.close()  
  db.close()
  </code></pre>