selenium scroll down python

   for i in range(20): # adjust integer value for need
       # you can change right side number for scroll convenience or destination 
       driver.execute_script("window.scrollBy(0, 250)")
       # you can change time integer to float or remove
       time.sleep(1)

driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")

browser.execute_script("window.scrollTo(0,document.body.scrollHeight)")

while driver.find_element_by_tag_name('div'):
    driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    Divs=driver.find_element_by_tag_name('div').text
    if 'End of Results' in Divs:
        print 'end'
        break
    else:
        continue