python - Tkinter 数学测验

Question

这个程序有什么问题吗？每次我运行它时，在我按下开始之前都会显示第一个数学问题。而且答案始终是第一道数学题，永远不会改变。另外，计时器上面不应该有数学问题。谢谢，斯科特

from Tkinter import*
import time
import tkMessageBox
import random

def Questions():    
    number1 = random.randrange(1,25)
    number2 = random.randrange(1,50)
    answer = number1 + number2
    prompt = ("Add " + str(number1) + " and " + str(number2))
    label1 = Label(root, text=prompt, width=len(prompt), bg='yellow')
    label1.pack()
    return answer

def start():
    global count_flag 
    Questions()
    count_flag = True
    count = 0.0
    while True:
        if count_flag == False:
            break
        # put the count value into the label
        label['text'] = str(count)
        # wait for 0.1 seconds
        time.sleep(0.1)
        # needed with time.sleep()
        root.update()
        # increase count
        count += 0.1

def Submit(answer, entryWidget):
     """ Display the Entry text value. """
     global count_flag

     count_flag = False
     print answer

     if entryWidget.get().strip() == "":
         tkMessageBox.showerror("Tkinter Entry Widget", "Please enter a number.")

     if answer != int(entryWidget.get().strip()):
         tkMessageBox.showinfo("Answer", "INCORRECT!")
     else:
         tkMessageBox.showinfo("Answer", "CORRECT!")



# create a Tkinter window
root = Tk()

root.title("Math Quiz")
root["padx"] = 40
root["pady"] = 20   

# Create a text frame to hold the text Label and the Entry widget
textFrame = Frame(root)

#Create a Label in textFrame
entryLabel = Label(textFrame)
entryLabel["text"] = "Answer:"
entryLabel.pack(side=LEFT)

# Create an Entry Widget in textFrame
entryWidget = Entry(textFrame)
entryWidget["width"] = 50
entryWidget.pack(side=LEFT)

textFrame.pack()

#directions     
directions = ('Click start to begin. You will be asked a series of questions.')
instructions = Label(root, text=directions, width=len(directions), bg='orange')
instructions.pack()

# this will be a global flag
count_flag = True

answer = Questions()

Sub = lambda: Submit(answer, entryWidget)
#stopwatch = lambda: start(answer)

# create needed widgets
label = Label(root, text='0.0')
btn_submit = Button(root, text="Submit", command = Sub)
btn_start = Button(root, text="Start", command = start)
btn_submit.pack()
btn_start.pack()
label.pack()


# start the event loop
root.mainloop()

Answer 1

您的问题在于如何调用 Questions() 方法。您只需询问一次答案

answer = Questions()

并且您在按开始之前执行此操作(这就是为什么它在您按开始之前显示)

要修复它，您可以使用如下代码:

from Tkinter import*
import time
import tkMessageBox
import random

def Questions():    
    number1 = random.randrange(1,25)
    number2 = random.randrange(1,50)
    answer = number1 + number2
    prompt = ("Add " + str(number1) + " and " + str(number2))
    label1 = Label(root, text=prompt, width=len(prompt), bg='yellow')
    label1.pack()
    return answer

def start():
    global count_flag 
    global answer
    answer = Questions()
    count_flag = True
    count = 0.0
    while True:
        if count_flag == False:
            break
        # put the count value into the label
        label['text'] = str(count)
        # wait for 0.1 seconds
        time.sleep(0.1)
        # needed with time.sleep()
        root.update()
        # increase count
        count += 0.1

def Submit(answer, entryWidget):
     """ Display the Entry text value. """
     global count_flag

     count_flag = False
     print answer

     if entryWidget.get().strip() == "":
         tkMessageBox.showerror("Tkinter Entry Widget", "Please enter a number.")

     if answer != int(entryWidget.get().strip()):
         tkMessageBox.showinfo("Answer", "INCORRECT!")
     else:
         tkMessageBox.showinfo("Answer", "CORRECT!")



# create a Tkinter window
root = Tk()

root.title("Math Quiz")
root["padx"] = 40
root["pady"] = 20   

# Create a text frame to hold the text Label and the Entry widget
textFrame = Frame(root)

#Create a Label in textFrame
entryLabel = Label(textFrame)
entryLabel["text"] = "Answer:"
entryLabel.pack(side=LEFT)

# Create an Entry Widget in textFrame
entryWidget = Entry(textFrame)
entryWidget["width"] = 50
entryWidget.pack(side=LEFT)

textFrame.pack()

#directions     
directions = ('Click start to begin. You will be asked a series of questions.')
instructions = Label(root, text=directions, width=len(directions), bg='orange')
instructions.pack()

# this will be a global flag
count_flag = True


Sub = lambda: Submit(answer, entryWidget)
#stopwatch = lambda: start(answer)

# create needed widgets
label = Label(root, text='0.0')
btn_submit = Button(root, text="Submit", command = Sub)
btn_start = Button(root, text="Start", command = start)
btn_submit.pack()
btn_start.pack()
label.pack()


# start the event loop
root.mainloop()

在此代码中，每次您点击开始时答案都会更新，并且仅在您点击开始时更新。