【发布时间】：2021-09-15 06:59:12
【问题描述】：
我正在寻找有关如何解决我的问题的建议。我需要一种方法来将条目列表保存在我的saveInput() 方法中，以便稍后在课堂外使用不同的函数访问它。我想出的唯一解决方案是一个全局变量，但我被告知它们是魔鬼，当它们不恒定时我应该尽量避免它们。如果有人能给我一个解决方案，我将不胜感激。我的代码如下，包括 CSV 文件。
from tkinter import font as tkfont # python 3
import tkinter as tk
import csv
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")
# the container is where we'll stack a bunch of frames
# on top of each other, then the one we want visible
# will be raised above the others
container = tk.Frame(self)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}
for F in (StartPage, PageOne, PageTwo, PageThree, PageFour):
page_name = F.__name__
frame = F(parent=container, controller=self)
self.frames[page_name] = frame
# put all of the pages in the same location;
# the one on the top of the stacking order
# will be the one that is visible.
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame("StartPage")
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="This is the start page", font=controller.title_font)
label.pack(side="top", fill="x", pady=10)
button1 = tk.Button(self, text="Enter airport details",
command=lambda: controller.show_frame("PageOne"))
button2 = tk.Button(self, text="Enter flight details",
command=lambda: controller.show_frame("PageTwo"))
button3 = tk.Button(self, text="Enter price plan and calculate profit",
command=lambda: controller.show_frame("PageThree"))
button4 = tk.Button(self, text="Clear data",
command=lambda: controller.show_frame("PageFour"))
button1.pack()
button2.pack()
button3.pack()
button4.pack()
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
ukAirportOptionList = [
"LPL",
"BOH"
]
foreignAirportList = []
with open('Airports.csv', 'r') as fd:
reader = csv.reader(fd)
for row in reader:
foreignAirportList.append(row)
tk.Label(self, text="Airport Details", font=controller.title_font).grid()
ukAirportTracker = tk.StringVar()
ukAirportTracker.set("Select the UK Airport")
tk.OptionMenu(self, ukAirportTracker, *ukAirportOptionList).grid()
foreignAirportTracker = tk.StringVar()
foreignAirportTracker.set("Select the Oversea Airport")
tk.OptionMenu(self, foreignAirportTracker, *[airport[0] for airport in foreignAirportList]).grid()
saveButton = tk.Button(self, text="Save",
command=lambda: [controller.show_frame("StartPage"),
self.saveInput(ukAirportTracker, foreignAirportTracker)])
saveButton.grid(row=3, column=1)
def saveInput(self, *args):
enteries = []
for arg in args:
enteries.append(arg.get())
print(enteries)
class PageTwo(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
aircraftTypesList = [['medium narrow body', 8, 2650, 180, 8],
['large narrow body', 7, 5600, 220, 10],
['medium wide body', 5, 4050, 406, 14]]
label = tk.Label(self, text="Flight Details", font=controller.title_font)
label.grid()
aircraftTypeTracker = tk.StringVar()
aircraftTypeTracker.set("Aircraft Type")
tk.OptionMenu(self, aircraftTypeTracker, *[aircraft[0] for aircraft in aircraftTypesList]).grid()
saveButton = tk.Button(self, text="Save",
command=lambda: [controller.show_frame("StartPage"), self.saveInput(aircraftTypeTracker)])
saveButton.grid()
def saveInput(self, *args):
enteries = []
for arg in args:
enteries.append(arg.get())
print(enteries)
class PageThree(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
tk.Label(self, text="This is page 3", font=controller.title_font).grid(row=0, column=0)
tk.Label(self, text="Price of Standard Seat").grid(row=1)
tk.Label(self, text="Price of First Class Seat").grid(row=2)
e1 = tk.Entry(self)
e2 = tk.Entry(self)
e1.grid(row=1, column=1)
e2.grid(row=2, column=1)
saveButton = tk.Button(self, text="Save",
command=lambda: [controller.show_frame("StartPage"), self.saveInput(e1, e2)])
saveButton.grid(row=3, column=1)
def saveInput(self, *args):
enteries = []
for arg in args:
enteries.append(arg.get())
print(enteries)
class PageFour(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="This is page 4", font=controller.title_font)
label.pack(side="top", fill="x", pady=10)
button = tk.Button(self, text="Go to the start page",
command=lambda: controller.show_frame("StartPage"))
button.pack()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
csv 文件：
JFK,John F Kennedy International,5326,5486
ORY,Paris-Orly,629,379
MAD,Adolfo Suarez Madrid-Barajas,1428,1151
AMS,Amsterdam Schiphol,526,489
CAI,Cairo International,3779,3584
【问题讨论】：
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请阅读来自this answer的问题链接。有一个问题几乎完全符合您的要求。