我的程序应该计算电话费用。它运行但不计算答案，但显示单选按钮的编号。
# Import tkinter
import tkinter
import tkinter.messagebox
dayVal = 0
eveVal = 0
off_peak = 0
# Create the class
class MyGUI:
def __init__(self):
# Create the main window.
self.main_window = tkinter.Tk()
# Create the variable objects to display
self.rb1_value = tkinter.StringVar()
self.rb2_value = tkinter.StringVar()
self.rb3_value = tkinter.StringVar()
# Create two frames. One for the Radiobuttons
# and another for the regular Button widgets.
self.info_frame = tkinter.Frame(self.main_window)
self.button_frame = tkinter.Frame(self.main_window)
self.fourth_frame = tkinter.Frame(self.main_window)
# Create the label for the promt frame.
self.prompt_label = tkinter.Label(self.fourth_frame, \
text='Enter the length of the call (in minutes):')
# Create the entry box for the top frame.
self.minute_entry = tkinter.Entry(self.fourth_frame, \
width=10)
# Placement of the top label, and the entry box.
self.prompt_label.pack(side='left')
self.minute_entry.pack(side ='right')
# Create an IntVar object to use with the Radiobuttons.
self.radio_var = tkinter.IntVar()
# Set the intVar object.
self.radio_var.set(dayVal)
self.radio_var.set(eveVal)
self.radio_var.set(off_peak)
# Create the Radiobutton widgets in the top_frame.
self.rb1 = tkinter.Radiobutton(self.info_frame, \
text='Daytime (6:00 am - 5:59 pm), $0.07/minute',
variable=self.radio_var, \
value=1)
self.rb2 = tkinter.Radiobutton(self.info_frame, \
text='Evening (6:00 pm - 11:59 pm), $0.12/minute',
variable=self.radio_var, \
value=2)
self.rb3 = tkinter.Radiobutton(self.info_frame, \
text='Off-Peak (midnight - 5:59 pm), $0.05/minute',
variable=self.radio_var, \
value=3)
# Pack the Radio Buttons
self.rb1.pack()
self.rb2.pack()
self.rb3.pack()
# Create a Calculate cost button and a Quit button
self.show_info_button = tkinter.Button(self.button_frame, \
text='Calculate cost', command=self.show)
self.quit_button = tkinter.Button(self.button_frame, \
text='Quit', command=self.main_window.destroy)
# Pack the Buttons
self.show_info_button.pack(side='left')
self.quit_button.pack(side='right')
# Pack the frames
self.info_frame.pack()
self.fourth_frame.pack()
self.button_frame.pack()
# Start the mainloop
tkinter.mainloop()
def calculate(self):
lengthVal = float(self.minute_entry.get())
dayVal = format(lengthVal * .07, ',.2f')
eveVal = format(lengthVal * .12, ',.2f')
off_peak = format(lengthVal * .05, ',.2f')
# The do something method is the callback function for the Calculate button.
def show(self):
tkinter.messagebox.showinfo('The cost of the call is: ', +\
float(self.radio_var.get()))
# Create an instance of the MyGUI class
my_gui = MyGUI()
答案 0 :(得分：1)
这解决了它。问题是你试图操纵全局变量。一旦设置了全局变量，它通常不会发生变化（更多信息如下）。为了解决这个问题，我将你的全局变为类属性。
另外，我应该进一步提到你的全局变量可以更精确。您可以使用global命令来更改它们，但由于您已经在使用类属性，因此在这里更合适。通常，全局变量设置为在整个程序中保持不变的事物。
此外，我稍微更改了calculate功能，以检查用户当前设置的单选按钮，然后检查所有三个常用cost变量。根据选择的内容，它将根据您设置的成本因素计算呼叫成本。另外，我应该提到format在这里有点多余（imo）。
import tkinter
import tkinter.messagebox
# Create the class
class MyGUI:
def __init__(self):
# Create the main window.
self.main_window = tkinter.Tk()
self.main_window.title("Call Calculator")
# Create the variable objects to display
self.rb1_value = tkinter.StringVar()
self.rb2_value = tkinter.StringVar()
self.rb3_value = tkinter.StringVar()
# Create two frames. One for the Radiobuttons
# and another for the regular Button widgets.
self.info_frame = tkinter.Frame(self.main_window)
self.button_frame = tkinter.Frame(self.main_window)
self.fourth_frame = tkinter.Frame(self.main_window)
# Create the label for the promt frame.
self.prompt_label = tkinter.Label(self.fourth_frame, \
text='Enter the length of the call (in minutes):')
# Create the entry box for the top frame.
self.minute_entry = tkinter.Entry(self.fourth_frame, \
width=10)
# Placement of the top label, and the entry box.
self.prompt_label.pack(side='left')
self.minute_entry.pack(side ='right')
# Create an IntVar object to use with the Radiobuttons.
self.radio_var = tkinter.IntVar()
#make globals class attributes
self.dayVal = 0
self.eveVal = 0
self.off_peak = 0
# Set the intVar object.
self.radio_var.set(self.dayVal)
self.radio_var.set(self.eveVal)
self.radio_var.set(self.off_peak)
# Create the Radiobutton widgets in the top_frame.
self.rb1 = tkinter.Radiobutton(self.info_frame, \
text='Daytime (6:00 am - 5:59 pm), $0.07/minute',
variable=self.radio_var, \
value=1)
self.rb2 = tkinter.Radiobutton(self.info_frame, \
text='Evening (6:00 pm - 11:59 pm), $0.12/minute',
variable=self.radio_var, \
value=2)
self.rb3 = tkinter.Radiobutton(self.info_frame, \
text='Off-Peak (midnight - 5:59 pm), $0.05/minute',
variable=self.radio_var, \
value=3)
# Pack the Radio Buttons
self.rb1.pack()
self.rb2.pack()
self.rb3.pack()
# Create a Calculate cost button and a Quit button
self.show_info_button = tkinter.Button(self.button_frame, \
text='Calculate cost', command=self.show)
self.quit_button = tkinter.Button(self.button_frame, \
text='Quit', command=self.main_window.destroy)
# Pack the Buttons
self.show_info_button.pack(side='left')
self.quit_button.pack(side='right')
# Pack the frames
self.info_frame.pack()
self.fourth_frame.pack()
self.button_frame.pack()
# Start the mainloop
tkinter.mainloop()
def calculate(self):
lengthVal = float(self.minute_entry.get())
sel_radio = self.radio_var.get()
if sel_radio == 1:
cost = format(lengthVal * .07, ',.2f')
elif self_radio == 2:
cost = format(lengthVal * .12, ',.2f')
else:
cost = format(lengthVal * .05, ',.2f')
return cost
# The do something method is the callback function for the Calculate button.
def show(self):
cost = self.calculate()
tkinter.messagebox.showinfo('Cost of Call:', "Your call has costed the following amount in USD\n\t\t$ %s" % cost)
# Create an instance of the MyGUI class
my_gui = MyGUI()
答案 1 :(得分：0)
您的calculate（）方法修改dayVal，eveVal和off_peak的局部变量。这可能不是你想要的。