Tkinter全局名称保持时间未定义

Question

import Tkinter
import random
from time import sleep

class simpleapp_tk(Tkinter.Tk):
    def __init__(self,parent):
        Tkinter.Tk.__init__(self,parent)
        self.parent = parent
        self.initialize()

    def initialize(self):
        self.grid()


        self.labelVariable = Tkinter.StringVar()
        label = Tkinter.Label(self,textvariable=self.labelVariable,anchor="w",fg="blue",bg="gold")
        label.grid(column=0,row=0,sticky='EW')
        self.labelVariable.set(u"Press button to begin!")


        self.button = Tkinter.Button(self,text=u"Start",
                                command=self.usertypetest(0),fg="black",bg="green")
        self.button.grid(column=2,row=0)


        self.labelVariable2 = Tkinter.StringVar()
        label2 = Tkinter.Label(self,textvariable=self.labelVariable2,anchor="w",fg="blue",bg="gold")
        label2.grid(column=1,row=0,sticky='EW')
        self.labelVariable2.set(u'Time')


        self.entryVariable = Tkinter.StringVar()
        self.entry = Tkinter.Entry(self,textvariable=self.entryVariable,fg="black",bg="white")
        self.entry.grid(column=0,row=1,columnspan=2,sticky='EW')
        self.entryVariable.set(u"")


        self.grid_columnconfigure(0,weight=1)
        self.grid_rowconfigure(0,weight=1)
        self.resizable(True,True)


    def keeptime(num1):
        self.entry.selection_range(0, Tkinter.END)
        timer = num1
        t = 0
        while timer < 1:
            self.labelVariable2.set(t)
            sleep(.01)
            t += .01



    def usertype(self):
        randletter = random.choice('qwer')
        self.labelVariable.set("Press "+randletter)
        userinput = self.entryVariable.get
        while userinput == '':
            pass
        if userinput == randletter:
            return 'Correct'    
        else:
            return 'Incorrect'

    def usertypetest(self,num1):
        keeptime(num1)
        for x in range(20):
            result = usertype()
            print result
            if result == 'Correct':
                y = y+5
            else:
                y = y-2
        timer += 1
        self.labelVariable.set(str(y)+' is your score')






if __name__ == "__main__":
    app = simpleapp_tk(None)
    app.title('LoL Practice')
    app.geometry("700x50")
    app.configure(background='black')
    app.mainloop()

那是我的程序。 该程序的目标是，当用户单击“开始”时，计时器将启动，并打印到标签上，并向他们显示从（Q，W，E，R）中随机选择的字母，他们必须尽快键入。 程序将对它们计时并在最后根据错误给出分数，并停止计时器。 我遇到的问题是它说：

Traceback (most recent call last):
  File "C:/Users/Brett/Documents/shellrunpractice", line 83, in <module>
    app = simpleapp_tk(None)
  File "C:/Users/Brett/Documents/shellrunpractice", line 9, in __init__
    self.initialize()
  File "C:/Users/Brett/Documents/shellrunpractice", line 22, in initialize
    command=self.usertypetest(0),fg="black",bg="green")
  File "C:/Users/Brett/Documents/shellrunpractice", line 66, in usertypetest
    keeptime(num1)
NameError: global name 'keeptime' is not defined

此问题已修复！

另外，在进行一些更改之前，代码没有产生错误，但是当我单击按钮时，程序刚刚挂起。 我想知道你们是否可以在我的代码中找到其他任何可能导致此错误的错误，如果可以，怎么办。 我意识到我的代码很糟糕，我只是从Tkinter开始，而且我还不确定是否一切正常。

Answer 1

您实际上应该使用self.keeptime(num1)而不是keeptime(num1)来访问类方法，并且应该将self作为keeptime方法的第一个参数

def keeptime(self,num1):
    self.entry.selection_range(0, Tkinter.END)
    timer = num1
    t = 0
    while timer < 1:
        self.labelVariable2.set(t)
        sleep(.01)
        t += .01