Why my python code is throwing several errors?

[amanulla1601]

from selenium import webdriver  
import time

driver=webdriver.Firefox()
time.sleep(3)
driver.minimize_window()
time.sleep(3)
driver.get("http://www.facebook.com")
time.sleep(3)
usr=input("Enter your username or Email \n")
pwd=input("Enter your password \n")
time.sleep(5)
username=driver.find_element_by_id("email")
username.send_keys(usr)
time.sleep(3)
password=driver.find_element_by_id("pass")
password.send_keys(pwd)
time.sleep(3)
login=driver.find_element_by_id("u_0_2")
login.click()