方法一，用try...except...
def is_element_exsist(driver, locator):
'''
判断元素是否存在,存在返回True,不存返回False
:param locator: locator为元组类型，如("id", "yoyo")
:return: bool值，True or False
'''
try:
driver.find_element(*locator)
return True
except Exception as msg:
print("元素s找不到：s" (locator, msg))
return False
if __name__ == '__main__':
loc1 = ("id", "yoyo") # 元素1
print(is_element_exsist(driver, loc1))