我正在创建一个与服务器交互的程序，该程序供员工在移动设备上使用，所以我使用的是Kivy，我首先使用GUI。我按照文档中的说明进行了最好的理解，但似乎无法解决这个问题。我的代码引用变量和函数，但是，无论何时它运行它崩溃并给我和错误代码，说明变量或函数的名称（无论哪个被称为第一个）未定义
这是我的代码：
import sqlalchemy
import os
import kivy
import datetime
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy import app
from kivy.uix import button
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.lang import Builder
admincode = "..."
# SQL Functions
# Incomplete as of now
# shift will be pulled from database
shift = False
def UserLogin(id = 'unfilled', password = 'unfilled'):
global user
global localhost_enabled
if id == "localtest" and password == admincode:
user = id
localhost_enabled = True
return True
elif id == "servertest" and password == admincode:
user = id
localhost_enabled = False
return True
def UserLogout():
user = ''
def ShiftIn():
global shift
shift = True
def ShiftOut():
global shift
shift = False
def submitform(StartCash=0, EndCash=0):
NetCash = EndCash - StartCash
print("NetCash = {0}".format(NetCash))
def ShiftGetter():
if shift == True:
return "Shift Out"
else:
return "Shift In"
# Kivy Building
Builder.load_string("""
<LoginScreen>:
BoxLayout:
Label:
text: 'ID:'
TextInput:
id: LoginInputUser
text: ''
multiline: False
Label:
text: "Password:"
TextInput:
id: LoginInputPassword
text: ''
password: True
multiline: False
Button:
text: 'login'
on_press:
if UserLogin(LoginInputUser.text, LoginInputPassword.text): LoginValidationText.text = ''
if UserLogin(LoginInputUser.text, LoginInputPassword.text): root.manager.current = 'Home'
else: LoginValidationText.text = 'Invalid Username or Password'
Label:
text: ''
id: 'LoginValidationText'
<HomeScreen>:
BoxLayout:
Button:
text: 'Logout'
on_press:
UserLogout()
root.manager.current = 'Login'
Button:
text: 'Open Submission Form'
on_press: root.manager.current = 'Form'
Button:
text: 'Shift Out' if shift == True else 'Shift In'
on_press:
if shift: ShiftOut()
else: ShiftIn()
<FormScreen>:
BoxLayout:
Button:
text: 'Back to menu'
on_press: root.manager.current = 'Home'
Label:
text: 'Start Money:'
TextInput:
id: StartCash
text: ''
multiline: False
Label:
text: 'End Money:'
TextInput:
id: EndCash
text: ''
multiline: False
Button:
text: 'Submit'
on_press: submitform(StartCash = int(StartCash.text), EndCash = int(EndCash.text))
""")
class LoginScreen(Screen):
pass
class HomeScreen(Screen):
pass
class FormScreen(Screen):
pass
sm = ScreenManager()
sm.add_widget(LoginScreen(name='Login'))
sm.add_widget(HomeScreen(name='Home'))
sm.add_widget(FormScreen(name='Form'))
class RealApp(App):
def build(self):
return sm
RealApp().run()
错误信息：
[INFO ] [Logger ] Record log in C:\Users\sherl\.kivy\logs\kivy_17-08-20_28.txt
[INFO ] [Kivy ] v1.10.0
[INFO ] [Python ] v3.6.2 (v3.6.2:5fd33b5, Jul 8 2017, 04:14:34) [MSC v.1900 32 bit (Intel)]
[INFO ] [Factory ] 194 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_gif (img_pil, img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [OSC ] using <thread> for socket
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] Using the "OpenGL" graphics system
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] Backend used <glew>
[INFO ] [GL ] OpenGL version <b'4.4.0 - Build 20.19.15.4531'>
[INFO ] [GL ] OpenGL vendor <b'Intel'>
[INFO ] [GL ] OpenGL renderer <b'Intel(R) HD Graphics 5500'>
[INFO ] [GL ] OpenGL parsed version: 4, 4
[INFO ] [GL ] Shading version <b'4.40 - Build 20.19.15.4531'>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <32>
[INFO ] [Shader ] fragment shader: <b"WARNING: 0:7: '' : #version directive missing">
[INFO ] [Shader ] vertex shader: <b"WARNING: 0:7: '' : #version directive missing">
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
Traceback (most recent call last):
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 249, in create_handler
return eval(value, idmap), bound_list
File "<string>", line 39, in <module>
NameError: name 'shift' is not defined
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 597, in _apply_rule
rctx['ids'])
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 254, in create_handler
cause=tb)
kivy.lang.builder.BuilderException: Parser: File "<inline>", line 39:
...
37: on_press: root.manager.current = 'Form'
38: Button:
>> 39: text: 'Shift Out' if shift == True else 'Shift In'
40: on_press:
41: if shift: ShiftOut()
...
NameError: name 'shift' is not defined
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 249, in create_handler
return eval(value, idmap), bound_list
File "<string>", line 39, in <module>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\sherl\PycharmProjects\PokerRoomSQL\User\UserDepreciated.py", line 126, in <module>
sm.add_widget(HomeScreen(name='Home'))
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\uix\relativelayout.py", line 265, in __init__
super(RelativeLayout, self).__init__(**kw)
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\uix\floatlayout.py", line 65, in __init__
super(FloatLayout, self).__init__(**kwargs)
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\uix\layout.py", line 76, in __init__
super(Layout, self).__init__(**kwargs)
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\uix\widget.py", line 345, in __init__
Builder.apply(self, ignored_consts=self._kwargs_applied_init)
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 451, in apply
self._apply_rule(widget, rule, rule, ignored_consts=ignored_consts)
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 612, in _apply_rule
e), cause=tb)
kivy.lang.builder.BuilderException: Parser: File "<inline>", line 39:
...
37: on_press: root.manager.current = 'Form'
38: Button:
>> 39: text: 'Shift Out' if shift == True else 'Shift In'
40: on_press:
41: if shift: ShiftOut()
...
BuilderException: Parser: File "<inline>", line 39:
...
37: on_press: root.manager.current = 'Form'
38: Button:
>> 39: text: 'Shift Out' if shift == True else 'Shift In'
40: on_press:
41: if shift: ShiftOut()
...
NameError: name 'shift' is not defined
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 249, in create_handler
return eval(value, idmap), bound_list
File "<string>", line 39, in <module>
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 597, in _apply_rule
rctx['ids'])
File "C:\Users\sherl\AppData\Local\Programs\Python\Python36-32\lib\site-packages\kivy\lang\builder.py", line 254, in create_handler
cause=tb)
答案 0 :(得分：1)
您有以下错误：
我已将程序分成Python程序和kv文件，如下所示。
import sqlalchemy
import os
import datetime
from kivy.app import App
from kivy.properties import BooleanProperty
from kivy.uix.screenmanager import ScreenManager, Screen
admincode = "..."
# SQL Functions
# Incomplete as of now
# shift will be pulled from database
shift = BooleanProperty(False)
def UserLogin(id='unfilled', password='unfilled'):
global user
global localhost_enabled
if id == "localtest" and password == admincode:
user = id
localhost_enabled = True
return True
elif id == "servertest" and password == admincode:
user = id
localhost_enabled = False
return True
def UserLogout():
user = ''
def ShiftIn():
shift = True
def ShiftOut():
shift = False
def submitform(StartCash=0, EndCash=0):
NetCash = EndCash - StartCash
print("NetCash = {0}".format(NetCash))
def ShiftGetter():
if shift:
return "Shift Out"
else:
return "Shift In"
class LoginScreen(Screen):
pass
class HomeScreen(Screen):
pass
class FormScreen(Screen):
pass
sm = ScreenManager()
sm.add_widget(LoginScreen(name='Login'))
sm.add_widget(HomeScreen(name='Home'))
sm.add_widget(FormScreen(name='Form'))
class RealApp(App):
def build(self):
return sm
if __name__ == '__main__':
RealApp().run()
#:kivy 1.10.0
<LoginScreen>:
BoxLayout:
Label:
text: 'ID:'
TextInput:
id: LoginInputUser
text: ''
multiline: False
Label:
text: "Password:"
TextInput:
id: LoginInputPassword
text: ''
password: True
multiline: False
Button:
text: 'login'
on_press:
if UserLogin(LoginInputUser.text, LoginInputPassword.text): LoginValidationText.text = ''
if UserLogin(LoginInputUser.text, LoginInputPassword.text): root.manager.current = 'Home'
else: LoginValidationText.text = 'Invalid Username or Password'
Label:
text: ''
id: 'LoginValidationText'
<HomeScreen>:
BoxLayout:
Button:
text: 'Logout'
on_press:
UserLogout()
root.manager.current = 'Login'
Button:
text: 'Open Submission Form'
on_press: root.manager.current = 'Form'
Button:
text: 'Shift Out' if shift == True else 'Shift In'
on_press:
if shift: ShiftOut()
else: ShiftIn()
<FormScreen>:
BoxLayout:
Button:
text: 'Back to menu'
on_press: root.manager.current = 'Home'
Label:
text: 'Start Money:'
TextInput:
id: StartCash
text: ''
multiline: False
Label:
text: 'End Money:'
TextInput:
id: EndCash
text: ''
multiline: False
Button:
text: 'Submit'
on_press: submitform(StartCash = int(StartCash.text), EndCash = int(EndCash.text))