Changes

handles = driver.window_handles

driver.switch_to_window(handles[-1])

#Visit desired website

urllib.urlretrieve(url, tag)

driver.close()

switch_window()

pdfs_on_page = driver.find_elements_by_xpath("//div/div/div/article/div/ul/li/a")

#saves interior pdf

urllib.urlretrieve(url, pdf_tag)

driver.close()

switch_window()

print "download complete"