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4-11章节执行报错：TypeError: object of type 'NoneType' has no len() ，不知道是什么原因

老师不知道这个错是什么原因造成的，图片识别的代码可以运行，但按照4-11章节来运行，就会报错

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from page.register_page import Register_Page
from util.get_code import GetCode
class Register_Handle(object):
 
def __init__(self,driver):
self.driver = driver
self.register_p = Register_Page(self.driver)
def send_user_mail(self,email):
self.register_p.get_email_element().send_keys(email)
def send_user_name(self,name):
self.register_p.get_username_element().send_keys(name)
def send_user_password(self,password):
self.register_p.get_password_element().send_keys(password)
 
def send_user_code(self,filename):
get_code_text = GetCode(self.driver)
code = get_code_text.code_photo(filename)
self.register_p.get_code_element().send_keys(code)
 
def get_user_text(self,info,user_info):
try:
if info == 'user_email_error':
text = self.register_p.get_email_error_element().text
elif info == 'user_name_error':
text = self.register_p.get_name_error_element().text
elif info == 'user_password_error':
text = self.register_p.get_password_error_element().text
else:
text = self.register_p.get_code_error_elemenet().text
except:
text = None
return text
def click_register_button(self):
self.register_p.get_butten_element().click()
 
def get_register_text(self):
return self.register_p.get_butten_element().text
 
------------------------------------------------------
from handle.register_handle import Register_Handle
 
class Register_business(object):
 
def __init__(self,driver):
self.register_h = Register_Handle(driver)
def user_base(self,email,name,password,filename):
self.register_h.send_user_mail(email)
self.register_h.send_user_name(name)
self.register_h.send_user_password(password)
self.register_h.send_user_code(filename)
self.register_h.click_register_button()
 
def register_succes(self):
if self.register_h.get_register_text() == None:
return True
else:
return False
def login_email_error(self,email,name,password,filename):
self.user_base(email,name,password,filename)
if self.register_h.get_user_text('email_error',"请输入有效的电子邮件地址") == None:
return True
else:
return False
def login_username_error(self,email,name,password,filename):
self.user_base(email,name,password,filename)
if self.register_h.get_user_text('user_name_error',"字符长度必须大于等于4，一个中文字算2个字符") == None:
return True
else:
return False
 
def login_password_error(self,email,name,password,filename):
self.user_base(email,name,password,filename)
if self.register_h.get_user_text('user_password_error',"最少需要输入5个字符") == None:
return True
else:
return False
 
def login_code_error(self,email,name,password,filename):
self.user_base(email,name,password,filename)
if self.register_h.get_user_text('code_error',"验证码错误") == None:
return True
else:
return False
 
-----------------------------------------------------
from PIL import Image
from ShowapiRequest import ShowapiRequest
import time
class GetCode:
def __init__(self,driver):
self.driver = driver
def code_photo(self,filename):
self.driver.save_screenshot(filename)
element_code = self.driver.find_element_by_id("getcode_num")
left = element_code.location['x']
top = element_code.location['y']
right = element_code.size['width'] + left
height = element_code.size['height'] + top
im = Image.open(filename)
new_image = im.crop((left, top, right, height))
new_image.save(filename)
time.sleep(2)
 
def code_infor(self,filename):
self.code_photo(filename)
r = ShowapiRequest("http://route.showapi.com/184-4", "73290", "90d9d5556af84a7b8d2fe02047b92c7c")
r.addBodyPara("typeId", "35")
r.addBodyPara("convert_to_jpg", "0")
r.addFilePara("image", filename)
res = r.post()
print(res.text)
text = res.json()['showapi_res_body']['Result']
return text