Question

我的代码。 filepath的内容是我认为的重要内容。

# -*- coding: utf-8 -*-
"""
Created on Sun Jan 22 14:47:36 2017

@author: Jose Chong
"""
import json
import tkinter
import os

filepath = os.path.expanduser(r'~\Documents\joseDzirehChongToDoList\toDoListSaveFile.json')

master = tkinter.Tk()
master.title("To-Do List")
master.geometry("300x300")

masterFrame = tkinter.Frame(master)

masterFrame.pack(fill=tkinter.X)

checkboxArea = tkinter.Frame(masterFrame, height=26)

checkboxArea.pack(fill=tkinter.X)

inputStuff = tkinter.Frame(masterFrame)

checkboxList = []

with open(filepath) as infile:    
    checkboxList = json.load(infile)

def destroyCheckbox(checkbox, row):
    row.destroy()
    del checkboxList [checkboxList.index(str(checkbox))]

    with open(filepath, 'w') as outfile:
        json.dump(checkboxList, outfile)

for savedCheckbox in checkboxList:
    checkboxRow = tkinter.Frame(checkboxArea)
    checkboxRow.pack(fill=tkinter.X)
    checkbox1 = tkinter.Checkbutton(checkboxRow, text=savedCheckbox)
    checkbox1.pack(side=tkinter.LEFT)
    deleteItem = tkinter.Button(checkboxRow, text="x", bg="red", fg="white",
                                activebackground="white", activeforeground="red",
                                command=lambda c=savedCheckbox, r=checkboxRow: destroyCheckbox(c, r))
    deleteItem.pack(side=tkinter.RIGHT)

    with open(filepath, 'w') as outfile:
        json.dump(checkboxList, outfile)

def drawCheckbox():
    newCheckboxInput = entry.get()
    def destroyCheckbox():
        checkboxRow.destroy()
        del checkboxList[checkboxList.index(newCheckboxInput)]
        with open(filepath, 'w') as outfile:
            json.dump(checkboxList, outfile)                 
    checkboxList.append(newCheckboxInput)
    entry.delete(0,tkinter.END)
    checkboxRow = tkinter.Frame(checkboxArea)
    checkboxRow.pack(fill=tkinter.X)
    checkbox1 = tkinter.Checkbutton(checkboxRow, text = checkboxList[-1])
    checkbox1.pack(side=tkinter.LEFT)
    deleteItem = tkinter.Button(checkboxRow, text = "x", command=lambda c=savedCheckbox, r=checkboxRow: destroyCheckbox(c, r), bg="red", fg="white", activebackground="white", activeforeground="red")
    deleteItem.pack(side=tkinter.RIGHT)

    with open(filepath, 'w') as outfile:
        json.dump(checkboxList, outfile)


def createInputStuff():
    paddingFrame = tkinter.Frame(inputStuff, height=5)
    paddingFrame.pack(fill=tkinter.X)
    buttonDone.pack()
    inputStuff.pack()
    buttonAdd.pack_forget()
    master.bind('<Return>', lambda event: drawCheckbox())

def removeInputStuff():
    inputStuff.pack_forget()
    buttonAdd.pack()
    buttonDone.pack_forget()
    master.unbind('<Return>')


buttonDone = tkinter.Button(inputStuff, text = "Close Input", command=removeInputStuff)


buttonAdd = tkinter.Button(masterFrame, text="Add Item", command=createInputStuff)
buttonAdd.pack()


topInput = tkinter.Frame(inputStuff)
bottomInput = tkinter.Frame(inputStuff)

topInput.pack()
bottomInput.pack()

prompt = tkinter.Label(topInput, text="What do you want your checkbox to be for?")
prompt.pack()
entry = tkinter.Entry(bottomInput, bd=3)
entry.pack(side=tkinter.LEFT)
buttonConfirm = tkinter.Button(bottomInput, text="Confirm", command=drawCheckbox)
buttonConfirm.pack(side=tkinter.LEFT)

master.mainloop()

使用print（filepath）我可以看到文件路径是有效的，＆＃34; C：\ Users \ Josalina \ Documents \ joseDzirehChongToDoList \ toDoListSaveFile.json＆＃34;打印出来。但是，我收到此错误（如果可能需要，请转到错误的末尾，其余部分仅用于上下文）

Traceback (most recent call last):

  File "<ipython-input-33-f554d849ad97>", line 1, in <module>
    runfile('C:/Users/Josalina/Desktop/Coding/Language - Python/to-do-list-to-compile/toDoList.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/toDoList.py", line 30, in <module>
    checkboxList = json.load(infile)

  File "C:\Users\Josalina\Anaconda3\lib\json\__init__.py", line 268, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)

  File "C:\Users\Josalina\Anaconda3\lib\json\__init__.py", line 319, in loads
    return _default_decoder.decode(s)

  File "C:\Users\Josalina\Anaconda3\lib\json\decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())

  File "C:\Users\Josalina\Anaconda3\lib\json\decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None

JSONDecodeError: Expecting value

我甚至没有357行，我只有107行代码。我该如何解决？我们的想法是，它应该将列表中的项添加到JSON文件中，基本上是this，但JSON文件位于不同的位置。

Answer 1

这是一个空文件......程序拒绝运行，因此它是一个空文件

你不能json.load一个空文件。这就是程序拒绝运行的原因。

你的代码在这里......

checkboxList = []

with open(filepath) as infile:    
    checkboxList = json.load(infile)

您只需将[]放入文件即可。它不能是空的。

该列表应该在程序第一次运行时添加到文件中

然后你需要这样的东西来添加“到文件”，而不是“从文件”中读取

with open(filepath, 'w') as fp:
    json.dump(checkboxList, fp)

我在第357行收到JSONDecodeError。我甚至没有第357行

1 个答案: