Warning: file_get_contents(/data/phpspider/zhask/data//catemap/2/python/297.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181

Warning: file_get_contents(/data/phpspider/zhask/data//catemap/1/ms-access/4.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
需要了解python中的此错误文本的帮助:_Python_Tkinter_Traceback - Fatal编程技术网

需要了解python中的此错误文本的帮助:

需要了解python中的此错误文本的帮助:,python,tkinter,traceback,Python,Tkinter,Traceback,好的,所以基本上我写了一个不太漂亮的GUI,它提供随机的简单数学问题。它就像我想要的那样工作。但是,每当我单击enter时,空闲外壳就会向我吐出红色。尽管如此,正如我所说,它仍能继续发挥我所希望的作用。因此,我很难理解为什么我的代码的这一特定部分会导致问题。为代码的冗长部分道歉: from tkinter import Label, Frame, Entry, Button, LEFT, RIGHT, END from tkinter.messagebox import showinfo imp

好的,所以基本上我写了一个不太漂亮的GUI,它提供随机的简单数学问题。它就像我想要的那样工作。但是,每当我单击enter时,空闲外壳就会向我吐出红色。尽管如此,正如我所说,它仍能继续发挥我所希望的作用。因此,我很难理解为什么我的代码的这一特定部分会导致问题。为代码的冗长部分道歉:

from tkinter import Label, Frame, Entry, Button, LEFT, RIGHT, END
from tkinter.messagebox import showinfo
import random

class Ed(Frame):
    'Simple arithmetic education app'
    def __init__(self,parent=None):
        'constructor'
        Frame.__init__(self, parent)
        self.pack()
        self.tries = 0
        Ed.make_widgets(self)
        Ed.new_problem(self)

    def make_widgets(self):
        'defines Ed widgets'
        self.entry1 = Entry(self, width=20, bg="gray", fg ="black")
        self.entry1.grid(row=0, column=0, columnspan=4)
        self.entry1.pack(side = LEFT)
        self.entry2 = Entry(self, width=20, bg="gray", fg ="black")
        self.entry2.grid(row=2, column=2, columnspan=4)
        self.entry2.pack(side = LEFT)
        Button(self,text="ENTER", command=self.evaluate).pack(side = RIGHT)

    def new_problem(self):
        'creates new arithmetic problem'
        opList = ["+", "-"]
        a = random.randrange(10+1)
        b = random.randrange(10+1)
        op = random.choice(opList)
        if b > a:
            op = "+"
        self.entry1.insert(END, a)
        self.entry1.insert(END, op)
        self.entry1.insert(END, b)


    def evaluate(self):
        'handles button "Enter" clicks by comparing answer in entry to correct result'
        result = eval(self.entry1.get())
        if result == eval(self.entry2.get()):
            self.tries += 1
            showinfo(title="Huzzah!", message="That's correct! Way to go! You got it in {} tries.".format(self.tries))
            self.entry1.delete(0, END)
            self.entry2.delete(0, END)
            self.entry1.insert(END, self.new_problem())
        else:
            self.tries += 1
            self.entry2.delete(0, END)
这是我得到的信息:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python32\lib\tkinter\__init__.py", line 1399, in __call__
    return self.func(*args)
  File "C:\Python32\Python shit\csc242hw4\csc242hw4.py", line 55, in evaluate
    self.entry1.insert(END, self.new_problem())
  File "C:\Python32\lib\tkinter\__init__.py", line 2385, in insert
    self.tk.call(self._w, 'insert', index, string)
_tkinter.TclError: wrong # args: should be ".52882960.52883240 insert index text"

错误消息说Tkinter认为它获取了错误的args数

再回溯一下,我们看到这一行导致了错误:

File "C:\Python32\Python shit\csc242hw4\csc242hw4.py", line 55, in evaluate
    self.entry1.insert(END, self.new_problem())
但这似乎是正确的论据数量!发生了什么事

问题是
self.new\u problem()
返回
None
。当参数为
None
时,Python的Tkinter包装器似乎不会传递参数

要解决此问题,请取消对
insert
的调用,并将第55行更改为

self.new_problem()

这是因为您已经在调用
self.entry.insert
从内部
新问题

太棒了!你是对的,我太专注于使用insert语句了,以至于忽略了我在以前的函数中已经在这样做的事实,所以我需要做的就是调用它。非常感谢您花时间查看我的代码!注意:不要使用eval()从字符串中获取值。如果需要整数,请使用int()。如果您希望使用float,请使用float()。