Le nom n'est pas défini lors de l'utilisation de variables et de fonctions dans Kivy

Question

Je crée un programme qui interagit avec un serveur, ce programme est destiné aux employés sur un appareil mobile, donc j'utilise Kivy, et je le fais l'interface graphique en premier. J'ai suivi les instructions sur la documentation au mieux de ma compréhension, mais je n'arrive pas à résoudre ce problème. Mon code fait référence aux variables et fonctions, mais, chaque fois qu'il fonctionne, il se bloque et me donne et le code d'erreur indiquant que le nom d'une variable ou une fonction (selon que l'on appelle en premier) n'est pas défini

Voici mon code:

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() 

Et le message d'erreur:

[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) 

Answer 1

Vous avez les erreurs suivantes:

1. Change "de l'application d'importation Kivy" à "d'importation kivy.app App"
2. Ajouter "de kivy.properties importer BooleanProperty"
3. Remplacer "shift = False" pour "shift = BooleanProperty (Faux)"
4. Supprimez toutes les références à "global shift"

J'ai séparé le programme en programme Python et en fichier kv comme indiqué ci-dessous.

modifed main.py

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() 

real.kv

#: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))