from selenium import webdriver   
   browser = webdriver.Chrome()
    url = 'http://xxxx.com/site/signup'
    browser.get(url)
    time.sleep(1)
    # 通过class name方式定位
    browser.find_element_by_id("signupform-username").send_keys(str(email))
    browser.find_element_by_id("signupform-email").send_keys(str(email))
    browser.find_element_by_id("signupform-password").send_keys('123456')
    browser.find_element_by_name("signup-button").click()
    time.sleep(2)
    browser.quit()

1.先下载http://chromedriver.storage.googleapis.com/index.html对应版本
2.安装selenium 
3.copy代码进行修改