Question

我使用Tkinter编写了一个GUI，第一次运行时工作正常。但是，在退出后我尝试再次运行它，我收到以下错误：

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Anaconda\lib\lib-tk\Tkinter.py", line 1470, in __call__
return self.func(*args)
File "G...tkinter_ny.py", line 55, in <lambda>
self.myRunModelButton=tk.Button(f1,text='Run Model', command=lambda: self.BeregnModel(), width=15, height=4)
File "G...tkinter_ny.py", line 115, in BeregnModel
sl.sim(self.model,self.data,'2013Q3','2015Q4')
File "stresslos.py", line 115, in sim
print (period,' solved')
File "G...tkinter_ny.py", line 39, in write
**self.text_area.insert(tk.END, str)**
File "C:\Anaconda\lib\lib-tk\Tkinter.py", line 3048, in insert
self.tk.call((self._w, 'insert', index, chars) + args)
TclError: invalid command name ".192096136L.192102984L"

我怀疑在运行用于修改stdput的代码时出现错误：该行封装在**中的问题。

    class StdoutRedirector(object):

        def __init__(self, text_area):
            self.text_area = text_area

        def write(self, str):
            **self.text_area.insert(tk.END, str)**
            self.text_area.see(tk.END)
            self.text_area.update() #to be added to get it in real time

任何人都知道为什么会这样吗？

感谢您的回答。完整代码添加：

import Tkinter as tk
import ttk as ttk
import pandabank as pb
import sys as sys
import subprocess as sp

class StresGUI(tk.Tk, ):
def __init__(self,inputData, inputModel):
    tk.Tk.__init__(self)

#        w,h=1000,900     
#        self.geometry("%dx%d+0+0" % (w, h))
    self.grid()
    self.title(The Name) #name of frame
    #initializing data
    self.data=pb.databank('')
    self.data.set_data(inputData)
    self.model=inputModel  
    self.selection = None

    #self.frame=tk.Frame()
    nb=ttk.Notebook(self)
    nb.pack(fill='both', expand='yes')

    #class redirect and update widgets with shell output in real time
    class StdoutRedirector(object):

        def __init__(self, text_area):
            self.text_area = text_area

        def write(self, str):
            self.text_area.insert(tk.END, str)
            self.text_area.see(tk.END)
            self.text_area.update() #to be added to get it in real time

    # create a child frame for each page
    f1 = tk.Frame()
    f2 = tk.Frame()
    f3 = tk.Frame()

    # create the pages
    nb.add(f1, text='Solve models')
    nb.add(f2, text='Bank information')
    nb.add(f3, text='Treeview')

    '''Adding items to frame 1 - Solve model'''
    #put run model button on frame1
    self.myRunModelButton=tk.Button(f1,text='Run Model', command=lambda: self.BeregnModel(), width=15, height=4)
    self.myRunModelButton.pack(side=tk.TOP, fill=tk.BOTH)       
    #Quit program button on fram1
         self.myQuitButton=tk.Button(f1,text='Quit', command=self.destroy,width=15, height=4)
         self.myQuitButton.pack(side=tk.BOTTOM, fill=tk.BOTH)

    outputPanel =tk.Text(f1, wrap='word', height = 25, width=40)
    outputPanel1 =tk.Text(f2, wrap='word', height = 25, width=40)         
    outputPanel.pack(side=tk.BOTTOM)
    outputPanel1.pack(side=tk.BOTTOM)
    self.out1=StdoutRedirector(outputPanel)
    self.out2=StdoutRedirector(outputPanel1)        
    sys.stdout = self.out1 #setting print output to frame1 initially
    f1.bind("<Enter>",lambda e: self.useOut1())  #changig print output when entering the frame 
    f2.bind("<Enter>",lambda e: self.useOut2())   #changig print output when entering the frame 


    '''Adding items to frame 2 - Bank info'''
    #plot values button
    self.myPlotButton=tk.Button(f2,text='Plot values', command=lambda: self.PlotValues(self.data),width=15, height=4)
    self.myPlotButton.pack(side=tk.TOP, fill=tk.BOTH) 
    #print values button
    self.myPrintButton=tk.Button(f2,text='Print values', command=lambda:self.PrintValues(self.data),width=15, height=4)
    self.myPrintButton.pack(side=tk.TOP, fill=tk.BOTH, anchor=tk.NW,before=self.myPlotButton) 
         #scrollbar for var selection
    f2.scrollbar=ttk.Scrollbar(f2)
    f2.scrollbar.pack(side=tk.RIGHT, fill=tk.BOTH)         
    lb = tk.Listbox(f2, yscrollcommand=f2.scrollbar.set, width=50)
    for items in self.model.allvar:
        lb.insert(tk.END,items)
    lb.bind("<Double-Button-1>", self.SelectVar)
    lb.pack(side=tk.LEFT, fill=tk.BOTH) 
    f2.scrollbar.config(command=lb.yview)

def SelectVar(self, event):
    widget = event.widget
    selection=widget.curselection()            
    value = widget.get(selection[0])
    self.selection=value

def BeregnModel(self):
    import stresslos as sl    
    try:
        os.remove('los.pyc')
    except: 
        pass        
    sl.simskriv(self.model)
    sl.sim(self.model,self.data,'2013Q3','2015Q4') 

def PlotValues(self,inputdata):
    fig=inputdata.data[app.selection].plot()
    return fig

def PrintValues(self,inputdata):
    if app.selection == None:
        print ('Please select variable to print')
    else:
        sp.call('cls',shell=True)
        inputdata.print_item(app.selection)       

def useOut1(self):
    sys.stdout = self.out1 

def useOut2(self):
    sys.stdout = self.out2

if __name__ == "__main__":
app = StresGUI(data,model)
app.mainloop()T

Answer 1

这必须与spyder有关，或者与你如何设置重定向器有关。我对spyder一无所知，所以我不能肯定地说。问题的关键是，你在一个被破坏的小部件上调用一个方法。

我的猜测是你重定向stdout，然后你退出程序，但stdout仍然被重定向。因此，当spyder需要打印某些东西时，它会尝试去旧的标准输出。当它这样做时，它会尝试将数据插入到已被销毁的旧文本小部件中。

第二次运行时，Tkinter会出错

1 个答案: