从字典和列表框中删除项目

Question

我有一个程序可以将字典的内容放入 Tkinter Listbox，但我无法从 Listbox 和字典中删除它。

from tkinter import *
import ast

f = open("orders.txt", "r")
contents = f.read()
f.close()
things = ast.literal_eval(contents)
secondthing = [things, "test"]
root = Tk()
f = Frame(root).pack()
l = Listbox(root)
b = Button(root, text = "delete selection", command = lambda: delete(l))
b.pack()
l.pack()

for i, j in things.items():
    oneitem = i + " " + j
    l.insert(END, oneitem)

def delete(listbox):

    global things
    # Delete from Listbox
    selection = l.curselection()
    l.delete(selection[0])
    # Delete from list that provided it
    evaluater = l.get(selection[0])
    value = eval(evaluater)
    ind = things.index(value)
    del(things[ind])
    print(things)

root.mainloop()

当我尝试删除某些内容时，它会给我：

Exception in Tkinter callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/tkinter/__init__.py", line 1883, in __call__
    return self.func(*args)
  File "/Users/mimmo/black_market/aaa.py", line 12, in <lambda>
    b = Button(root, text = "delete selection", command = lambda: delete(l))
  File "/Users/mimmo/black_market/aaa.py", line 28, in delete
    value = eval(evaluater)
  File "<string>", line 1
    ohhh ohhhhh
         ^
SyntaxError: unexpected EOF while parsing

谁能帮助我，因为我可以从 Listbox 中删除它，我只是在从字典中删除它时出错。

orders.txt的内容：

{"ayyy" : "ayyyyyy", "ohhh" : "ohhhhh"}

Answer 1

首先，我建议使用 json 或 pickle 来存储字典的内容——这是最常见的做法。我真的不明白你想做什么，所以我写了一个函数，它通过它的索引从列表框和事物中删除一个元素。您收到的错误是由 eval 函数引起的，该函数试图将您的列表框项目解释为 python 代码。当然，它会出现语法错误。

# Deletes element from listbox and thigs by it's index
def delete(listbox, index: int):
    global things
    item = listbox.get(index)
    key = item.split()[0]
    del things[key]
    listbox.delete(index)

从字典和列表框中删除项目

Delete item from dictionary and Listbox

python

listbox

tkinter