比如我下面這段給出的example，可以完成你的需求，模擬登入人人

# -*- coding:utf-8 -*-

from selenium import webdriver
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.common.by import
 
 By

wd = webdriver.Firefox()
wd.get("http://www.renren.com")
wd.maximize_window()

try:
    """這段可以檢視selenium的原始碼,屬於smart wait"""
    email = WebDriverWait(wd,timeout=10).until(EC.presence_of_element_located((By.ID,'email')),message=u'元素載入超時!')
    email.send_keys("*** 你的賬號 ***")
    passwd = WebDriverWait(wd,timeout=10
 
).until(EC.presence_of_element_located((By.ID,'password')),message=u'元素載入超時!')
    passwd.send_keys("*** 你的密碼 ***")
    wd.find_element_by_id("login").click() #點選登入
except NoSuchElementException as e:
    print e.message