Python Tkinter Spinboxes return 使用 for 循环的值
Python Tkinter Spinboxes return value using for loops
我正在尝试使用 X 多个旋转框，因为列表中有项目 - 所以使用 for 循环将它们放在屏幕上。
但是，当我单击按钮时，我似乎无法让它们达到 return 它们的值。
aStarter = ["Starter 1", "Starter 2", "Starter 3"]
def getOrders():
aStarterOrder = []
aMainOrder = []
aDessertOrder = []
for i in aStarterQuantity:
aStarterOrder.append(StarterQuantity.get())
print(aStarterOrder)
aStarterQuantity = []
StarterQuantity = IntVar()
for i in range(len(aStarter)):
lbl = Label(self, text = aStarter[i]).grid(column = 0, row = 2 + i)
StarterQuantity = Spinbox(self, from_=0, to=20, width=5, command=callback, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 1, row = 2 + i)
print(StarterQuantity.get())
我尝试将 StarterQuantity 附加到 for 循环内的数组：
aStarterQuantity = []
StarterQuantity = IntVar()
for i in range(len(aStarter)):
lbl = Label(self, text = aStarter[i]).grid(column = 0, row = 2 + i)
StarterQuantity = Spinbox(self, from_=0, to=20, width=5, command=callback, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 1, row = 2 + i)
aStarterQuantity.append(StarterQuantity.get())
这 return 是一个 None 类型错误 - 我似乎无法从旋转框中获取值。
有什么想法吗？
这是完整的代码（这是一个非常早期的 WIP！）
from tkinter import *
from tkinter.font import Font
import sqlite3
DatabaseFile = 'RMS.db'
connDatabase = sqlite3.connect(DatabaseFile)
#Creating a cursor to run SQL Commands
DatabaseSelect = connDatabase.cursor()
#Selecting all Menu Data
DatabaseSelect.execute("SELECT * FROM MENU")
MenuData = DatabaseSelect.fetchall()
class Main(Tk): #This sets up the initial Frame in a Window called Main
def __init__(self): #This creates a controller to use the Frames
Tk.__init__(self) #This creates a Window within the controller
self._frame = None #This sets the frame to have a value of None - this makes sure the main Window doesn't get destroyed by the switch frame function
self.switch_frame(Home)
def switch_frame(self, frame_class): #This function is used to switch frames. Self is the master frame, frame_class is the name of the Class (page) being passed int
new_frame = frame_class(self)
if self._frame is not None:
self._frame.destroy() #Destroy any frames except the master
self._frame = new_frame #Make a new frame
self._frame.grid(column=0, row=0) #Put the frame in the top left
class Home(Frame):
def __init__(self, master):
Frame.__init__(self, master)
Label(self, text="The White Horse").grid(column = 0, row = 0)
btnPage1 = Button(self, text="Orders", command=lambda: master.switch_frame(Orders)).grid(column = 1, row = 0)
#Making a blank page with a return home button
class Orders(Frame): #This sets up a class called Page1 - Each new page will need a new class.
def __init__(self, master): #This sets up a controller to put things into the Frame
Frame.__init__(self, master) #Make the frame using the controller
#Get list of Starters from Menu Data
aStarter = ["Starter 1", "Starter 2", "Starter 3"]
aMain = []
aDessert = []
for i in MenuData:
if i[3] == "Starters":
aStarter.append(i[1])
if i[3] == "Main":
aMain.append(i[1])
if i[3] == "Dessert":
aDessert.append(i[1])
def getOrders():
aStarterOrder = []
aMainOrder = []
aDessertOrder = []
for i in aStarterQuantity:
aStarterOrder.append(StarterQuantity.get())
print(aStarterOrder)
def callback():
print(StarterQuantity.get())
#Starter Section
boxes = []
aStarterQuantity = []
StarterQuantity = IntVar()
for i in range(len(aStarter)):
lbl = Label(self, text = aStarter[i]).grid(column = 0, row = 2 + i)
StarterQuantity = Spinbox(self, from_=0, to=20, width=5, command=callback, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 1, row = 2 + i)
aStarterQuantity.append(StarterQuantity.get())
#Mains Sections
for i in range(len(aMain)):
lbl = Label(self, text = aMain[i]).grid(column = 6, row = 2 + i)
MainQuantity = Spinbox(self, from_=0, to=20, width=5, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 7, row = 2 + i)
#Dessert Section
for i in range(len(aDessert)):
lbl = Label(self, text = aDessert[i]).grid(column = 12, row = 2 + i)
DessertQuantity = Spinbox(self, from_=0, to=20, width=5, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 13, row = 2 + i)
btnHome = Button(self, text="Home", command=lambda: master.switch_frame(Home)).grid(column = 0, row = 1) #Add a Button
btnSubmitEntries = Button(self, text = "Submit", command = getOrders).grid(column = 0, row= 20)
Main = Main()
Main.geometry("1200x800")
Main.mainloop()
问题似乎是 grid 方法没有 return 任何东西，所以 StarterQuantity 被分配 None 即默认 return 值对于一个函数。
for i in range(len(aStarter)):
lbl = Label(self, text=aStarter[i])
lbl.grid(column=0, row=2 + i)
sq_font = Font(family='Helvetica',
size=20,
weight='bold')
StarterQuantity = Spinbox(self,
from_=0,
to=20,
width=5, command=callback,
font=sq_font)
StarterQuantity.grid(column=1, row=2 + i)
aStarterQuantity.append(StarterQuantity.get())
这适用于我的情况。 （取出 Spinbox 的 Font 参数以提高移动设备的可读性）。
不相关的注释；我不知道你 prefer/have 维护什么代码风格，当然这取决于你，但我认为提及 Python (PEP8) 中的命名风格约定可能会有所帮助class 名称使用 CamelCase，变量名称使用 lower_case_w_underscores，常量使用 functions/methods，SCREAMING_SNAKE。
我正在尝试使用 X 多个旋转框，因为列表中有项目 - 所以使用 for 循环将它们放在屏幕上。
但是，当我单击按钮时，我似乎无法让它们达到 return 它们的值。
aStarter = ["Starter 1", "Starter 2", "Starter 3"]
def getOrders():
aStarterOrder = []
aMainOrder = []
aDessertOrder = []
for i in aStarterQuantity:
aStarterOrder.append(StarterQuantity.get())
print(aStarterOrder)
aStarterQuantity = []
StarterQuantity = IntVar()
for i in range(len(aStarter)):
lbl = Label(self, text = aStarter[i]).grid(column = 0, row = 2 + i)
StarterQuantity = Spinbox(self, from_=0, to=20, width=5, command=callback, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 1, row = 2 + i)
print(StarterQuantity.get())
我尝试将 StarterQuantity 附加到 for 循环内的数组：
aStarterQuantity = []
StarterQuantity = IntVar()
for i in range(len(aStarter)):
lbl = Label(self, text = aStarter[i]).grid(column = 0, row = 2 + i)
StarterQuantity = Spinbox(self, from_=0, to=20, width=5, command=callback, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 1, row = 2 + i)
aStarterQuantity.append(StarterQuantity.get())
这 return 是一个 None 类型错误 - 我似乎无法从旋转框中获取值。
有什么想法吗？
这是完整的代码（这是一个非常早期的 WIP！）
from tkinter import *
from tkinter.font import Font
import sqlite3
DatabaseFile = 'RMS.db'
connDatabase = sqlite3.connect(DatabaseFile)
#Creating a cursor to run SQL Commands
DatabaseSelect = connDatabase.cursor()
#Selecting all Menu Data
DatabaseSelect.execute("SELECT * FROM MENU")
MenuData = DatabaseSelect.fetchall()
class Main(Tk): #This sets up the initial Frame in a Window called Main
def __init__(self): #This creates a controller to use the Frames
Tk.__init__(self) #This creates a Window within the controller
self._frame = None #This sets the frame to have a value of None - this makes sure the main Window doesn't get destroyed by the switch frame function
self.switch_frame(Home)
def switch_frame(self, frame_class): #This function is used to switch frames. Self is the master frame, frame_class is the name of the Class (page) being passed int
new_frame = frame_class(self)
if self._frame is not None:
self._frame.destroy() #Destroy any frames except the master
self._frame = new_frame #Make a new frame
self._frame.grid(column=0, row=0) #Put the frame in the top left
class Home(Frame):
def __init__(self, master):
Frame.__init__(self, master)
Label(self, text="The White Horse").grid(column = 0, row = 0)
btnPage1 = Button(self, text="Orders", command=lambda: master.switch_frame(Orders)).grid(column = 1, row = 0)
#Making a blank page with a return home button
class Orders(Frame): #This sets up a class called Page1 - Each new page will need a new class.
def __init__(self, master): #This sets up a controller to put things into the Frame
Frame.__init__(self, master) #Make the frame using the controller
#Get list of Starters from Menu Data
aStarter = ["Starter 1", "Starter 2", "Starter 3"]
aMain = []
aDessert = []
for i in MenuData:
if i[3] == "Starters":
aStarter.append(i[1])
if i[3] == "Main":
aMain.append(i[1])
if i[3] == "Dessert":
aDessert.append(i[1])
def getOrders():
aStarterOrder = []
aMainOrder = []
aDessertOrder = []
for i in aStarterQuantity:
aStarterOrder.append(StarterQuantity.get())
print(aStarterOrder)
def callback():
print(StarterQuantity.get())
#Starter Section
boxes = []
aStarterQuantity = []
StarterQuantity = IntVar()
for i in range(len(aStarter)):
lbl = Label(self, text = aStarter[i]).grid(column = 0, row = 2 + i)
StarterQuantity = Spinbox(self, from_=0, to=20, width=5, command=callback, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 1, row = 2 + i)
aStarterQuantity.append(StarterQuantity.get())
#Mains Sections
for i in range(len(aMain)):
lbl = Label(self, text = aMain[i]).grid(column = 6, row = 2 + i)
MainQuantity = Spinbox(self, from_=0, to=20, width=5, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 7, row = 2 + i)
#Dessert Section
for i in range(len(aDessert)):
lbl = Label(self, text = aDessert[i]).grid(column = 12, row = 2 + i)
DessertQuantity = Spinbox(self, from_=0, to=20, width=5, font=Font(family='Helvetica', size=20, weight='bold')).grid(column = 13, row = 2 + i)
btnHome = Button(self, text="Home", command=lambda: master.switch_frame(Home)).grid(column = 0, row = 1) #Add a Button
btnSubmitEntries = Button(self, text = "Submit", command = getOrders).grid(column = 0, row= 20)
Main = Main()
Main.geometry("1200x800")
Main.mainloop()
问题似乎是 grid 方法没有 return 任何东西，所以 StarterQuantity 被分配 None 即默认 return 值对于一个函数。
for i in range(len(aStarter)):
lbl = Label(self, text=aStarter[i])
lbl.grid(column=0, row=2 + i)
sq_font = Font(family='Helvetica',
size=20,
weight='bold')
StarterQuantity = Spinbox(self,
from_=0,
to=20,
width=5, command=callback,
font=sq_font)
StarterQuantity.grid(column=1, row=2 + i)
aStarterQuantity.append(StarterQuantity.get())
这适用于我的情况。 （取出 Spinbox 的 Font 参数以提高移动设备的可读性）。