Mac无法使用COMMAND您需要的Keys.BACKSPACE 试试：
driver = self.driver
password = driver.find_element_by_xpath("//input[@name='password']")
password.clear()
password.send_keys(password)
password.send_keys(Keys.RETURN)
#password = webdriverwait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//input[@name='password']")))
#or
#time.sleep(1)
for i in range(len(password)):
password.send_keys(Keys.BACKSPACE)
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