我正在尝试开发一个使用通用充电器为某些电动自行车充电的应用程序。因此，用户需要一个帐户，在注册时，他们从微调器中选择了自己拥有的电动自行车。该值需要存储在用户文件中，以便以后使用。问题是，当我尝试保存帐户时，出现以下错误：
AttributeError: 'NoneType' object has no attribute 'text'
当我删除所有保存微调器值的程序时，该程序将正常运行。 有人可以帮我解决这个问题吗？
主应用程序ULiVEmain.py的一部分
class CreateAccountWindow(Screen): #create an account
namee = ObjectProperty(None)
email = ObjectProperty(None)
password = ObjectProperty(None)
bikebrand = ObjectProperty(None)
def submit(self):
if self.namee.text != "" and self.email.text != "" and self.email.text.count("@") == 1 and self.email.text.count(".") > 0:
if self.password != "":
db.add_user(self.email.text, self.password.text, self.namee.text, self.bikebrand.text)
self.reset()
sm.current = "login_screen"
else:
invalidForm()
else:
invalidForm()
def login(self):
self.reset()
sm.current = "login_screen"
def reset(self):
self.email.text = ""
self.password.text = ""
self.namee.text = ""
def spinnerBrand(self, text):
print("Brand of the bike is: " + text)
kv = Builder.load_file("LayoutULiVEApp.kv")
sm = WindowManager()
db = DataBase("users.txt")
用于保存帐户数据的py文件：database.py
import datetime
class DataBase:
def __init__(self, filename):
self.filename = filename
self.users = None
self.file = None
self.load()
def load(self):
self.file = open(self.filename, "r")
self.users = {}
for line in self.file:
email, password, name, created, bikebrand= line.strip().split(";")
self.users[email] = (password, name, created, bikebrand)
self.file.close()
def get_user(self, email):
if email in self.users:
return self.users[email]
else:
return -1
def add_user(self, email, password, name, bikebrand):
if email.strip() not in self.users:
self.users[email.strip()] = (password.strip(), name.strip(), bikebrand.strip(), DataBase.get_date())
self.save()
return 1
else:
print("Email exists already")
return -1
def validate(self, email, password):
if self.get_user(email) != -1:
return self.users[email][0] == password
else:
return False
def save(self):
with open(self.filename, "w") as f:
for user in self.users:
f.write(user + ";" + self.users[user][0] + ";" + self.users[user][1] + ";" + self.users[user][2] + ";" +self.users[user][3] + "\n")
@staticmethod
def get_date():
return str(datetime.datetime.now()).split(" ")[0]
kv文件的一部分，以创建一个帐户
<CreateAccountWindow>
name: "create"
namee: namee
email: email
password: passw
FloatLayout:
cols:1
FloatLayout:
size: root.width, root.height/2
Label:
text: "Create an Account"
size_hint: 0.8, 0.2
pos_hint: {"x":0.1, "top":1}
font_size: (root.width**2 + root.height**2) / 14**4
Label:
size_hint: 0.26,0.15
pos_hint: {"x":0, "top":0.8}
text: "Name: "
font_size: (root.width**2 + root.height**2) / 14**4
TextInput:
pos_hint: {"x":0.3, "top":0.76}
size_hint: 0.5, 0.08
id: namee
multiline: False
font_size: (root.width**2 + root.height**2) / 14**4
Label:
size_hint: 0.26,0.15
pos_hint: {"x":0, "top":0.7}
text: "Email: "
font_size: (root.width**2 + root.height**2) / 14**4
TextInput:
pos_hint: {"x":0.3, "top":0.66}
size_hint: 0.5, 0.08
id: email
multiline: False
font_size: (root.width**2 + root.height**2) / 14**4
Label:
size_hint: 0.2,0.15
pos_hint: {"x":0, "top":0.6}
text: "Password: "
font_size: (root.width**2 + root.height**2) / 14**4
TextInput:
pos_hint: {"x":0.3, "top":0.56}
size_hint: 0.5, 0.08
id: passw
multiline: False
password: True
font_size: (root.width**2 + root.height**2) / 14**4
Label:
size_hint: 0.26,0.15
pos_hint: {"x":0, "top":0.5}
text: "Bike: "
font_size: (root.width**2 + root.height**2) / 14**4
Spinner:
id: bikebrand
on_text:
root.spinnerBrand(bikebrand.text)
text: "<Select>"
values: ['Brand A', 'Brand B', 'Brand C', 'Brand D', 'Brand E', 'Brand F', 'Brand G', 'Brand H', 'Brand I']
background_color: 1,1,1,1
color: 0,0,0,1
color_down: 0,0,0,1
size_hint: 0.5, 0.08
pos_hint: {"x":0.3, "top":0.46}
Button:
pos_hint:{"x":0.3,"y":0.25}
size_hint: 0.5, 0.1
font_size: (root.width**2 + root.height**2) / 15**4
text: "Already have an Account? Log In"
background_color: 0.68, 0.8, 0.5, 0.18
color: 0,0,0,1
on_release:
root.manager.transition.direction = "left"
root.login()
Button:
pos_hint:{"x":0.3,"y":0.05}
size_hint: 0.5, 0.12
text: "Submit"
font_size: (root.width**2 + root.height**2) / 13**4
background_color: 0.68, 0.8, 0.5, 0.18
color: 0,0,0,1
on_release:
root.manager.transition.direction = "left"
root.submit()
答案 0 :(得分：0)
在您的kv文件中，您尚未定义ObjectProperty bikebrand。我相信您只需要更改：
namee: namee
email: email
password: passw
包括bikebrand：
namee: namee
email: email
password: passw
bikebrand: bikebrand