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我的代碼：入門嘗試一個AttributeError時IntVar（）分配給一個變量
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Created on Sun Jan 22 14:47:36 2017
@author: Jose Chong
"""
import json
try:
import tkinter as tk
except ImportError:
import Tkinter as tk
import os
import pymsgbox
filepath = os.path.expanduser(r'~\Documents\joseDzirehChongToDoList\toDoListSaveFile.json')
checkboxList = []
def checkSaveFile():
def checkExistenceOfSaveFile():
if not os.path.isdir(os.path.expanduser(r'~\Documents\joseDzirehChongToDoList')):
os.makedirs(os.path.expanduser(r'~\Documents\joseDzirehChongToDoList'), 777)
if not os.path.isfile(filepath):
open(filepath, 'w')
open(filepath).close()
def checkIfSaveFileIsEmpty():
global checkboxList
if os.path.getsize(filepath) == 0:
with open (filepath, 'w') as outfile:
json.dump(checkboxList, outfile)
with open(filepath) as infile:
checkboxList = json.load(infile)
checkExistenceOfSaveFile()
checkIfSaveFileIsEmpty()
try:
open(filepath, 'w')
open(filepath).close()
except (IOError, ValueError):
pymsgbox.alert("""You're not supposed to see this message ever. If you do, that means your save file is either missing or corrupted, and my methods of stopping that have failed. Please email me at '[email protected]' with a copy of your save file so I can tell what went wrong.
Click the button below to exit, the red button in the corner doesn't work.""", 'Broken Save File')
checkSaveFile()
var = tk.IntVar()
def loadToJSON():
with open(filepath, 'w') as outfile:
json.dump(checkboxList, outfile)
class CheckboxRow(tk.Frame):
def __init__(self, master, text):
self.text = text
tk.Frame.__init__(self, master)
checkbox = tk.Checkbutton(self, text=text, variable=var)
checkbox.pack(side=tk.LEFT)
deleteItem = tk.Button(self, text="x", bg="red", fg="white",
activebackground="white", activeforeground="red",
command=self.destroyCheckbox)
deleteItem.pack(side=tk.RIGHT)
newItem = [self.text, var.get()]
self.master.master.checkboxList.append(newItem)
loadToJSON()
def destroyCheckbox(self, text):
self.text = text
newItem = [self.text, var.get()]
self.master.master.checkboxList.remove(newItem)
self.destroy()
loadToJSON()
class CheckboxArea(tk.Frame):
def add(self, name):
row = CheckboxRow(self, name)
row.pack(fill=tk.X)
class InputStuff(tk.Frame):
def __init__(self, master=None, **kwargs):
tk.Frame.__init__(self, master, **kwargs)
prompt = tk.Label(self, text="What do you want your checkbox to be for?")
prompt.pack()
bottomInput = tk.Frame(self)
self.entry = tk.Entry(bottomInput, bd=3)
self.entry.pack(side=tk.LEFT)
buttonConfirm = tk.Button(bottomInput, text="Confirm", command=self.drawCheckbox)
buttonConfirm.pack(side=tk.LEFT)
bottomInput.pack()
buttonDone = tk.Button(self, text = "Close Input", command=master.hideInputStuff)
buttonDone.pack()
def drawCheckbox(self, event=None):
self.master.add(self.entry.get())
self.entry.delete(0, tk.END)
class MainWindow(tk.Frame):
def __init__(self, master=None, **kwargs):
tk.Frame.__init__(self, master, **kwargs)
self.checkboxList = []
self.checkboxArea = CheckboxArea(self)
self.checkboxArea.pack(fill=tk.X)
self.inputStuff = InputStuff(self)
self.addButton = tk.Button(self, text="Add Item", command=self.showInputStuff)
self.hideInputStuff() # start with "add" button active
self.load()
def load(self):
for savedCheckbox in checkboxList:
checkboxRow = tk.Frame(checkboxArea)
checkboxRow.pack(fill=tk.X)
checkbox1 = tk.Checkbutton(checkboxRow, text=savedCheckbox[0], variable=var)
checkbox1.pack(side=tk.LEFT)
deleteItem = tk.Button(checkboxRow, text="x", bg="red", fg="white",
activebackground="white", activeforeground="red",
command=lambda c=savedCheckbox, r=checkboxRow: destroyCheckbox(c, r))
deleteItem.pack(side=tk.RIGHT)
loadToJSON()
def add(self, name):
self.checkbox_area.add(name)
self.checkboxList.append(name)
def showInputStuff(self):
self.addButton.pack_forget()
self.input_stuff.pack()
self.input_stuff.entry.focus()
self.master.bind('<Return>', self.input_stuff.drawCheckbox)
def hideInputStuff(self):
self.inputStuff.pack_forget()
self.addButton.pack()
self.master.unbind('<Return>')
def main():
master = tk.Tk()
master.title("To-Do List (with saving!)")
master.geometry("300x300")
win = MainWindow(master)
win.pack(fill=tk.X)
master.mainloop()
if __name__ == "__main__":
main()
它的可怕壞了，我知道了。我不想幫助其他任何東西，只是AttributeError。
完整的錯誤：
runfile('C:/Users/Josalina/Desktop/Coding/Language - Python/to-do-list-to-compile/toDoListToCompile.py', wdir='C:/Users/Josalina/Desktop/Coding/Language - Python/to-do-list-to-compile')
Traceback (most recent call last):
File "<ipython-input-78-a1f8f63a42cc>", line 1, in <module>
runfile('C:/Users/Josalina/Desktop/Coding/Language - Python/to-do-list-to-compile/toDoListToCompile.py', wdir='C:/Users/Josalina/Desktop/Coding/Language - Python/to-do-list-to-compile')
File "C:\Users\Josalina\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 866, in runfile
execfile(filename, namespace)
File "C:\Users\Josalina\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/Josalina/Desktop/Coding/Language - Python/to-do-list-to-compile/toDoListToCompile.py", line 51, in <module>
var = tk.IntVar()
File "C:\Users\Josalina\Anaconda3\lib\tkinter\__init__.py", line 351, in __init__
Variable.__init__(self, master, value, name)
File "C:\Users\Josalina\Anaconda3\lib\tkinter\__init__.py", line 233, in __init__
self._root = master._root()
AttributeError: 'NoneType' object has no attribute '_root'
我不知道這意味着什麼。 IntVar（）不是Tkinter的標準部分嗎？爲什麼會引發錯誤？我如何解決它？另外，修復這個錯誤可能不會讓程序運行，它只會讓我轉向下一個錯誤。提前致謝！