我创建了一个简单的GUI应用程序来管理未知单词，同时学习一门新语言。名为Vocabulary的应用程序是用C＃编写的，它从XML文档中加载/保存单词。由于我最近从Windows切换到Linux，我正在使用Python重写应用程序。
尽管如此，编辑后保存一个单词我遇到了麻烦。
这是我的C＃方法：
void Save()
{
if (listView1.SelectedItems.Count > 0)
{
Word word = FindWord(listView1.SelectedItems[0].Text);
word.WordOrPhrase = txt_Word.Text;
word.Explanation = txt_Explanation.Text;
word.Translation = txt_Translation.Text;
word.Examples = txt_Examples.Text;
listView1.SelectedItems[0].Text = txt_Word.Text;
ReadOnlyON();
}
else
{
MessageBox.Show("You have not selected any contacts!", "Notification", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
SaveAll();
WordCount();
Sync();
}
...这是我的Python函数：
def save_item(self):
if len(self.listBox.curselection()) > 0:
word = self.find_word(self.listBox.curselection())
word.wordorphrase = self.get_word()
word.explanation = self.get_explanation()
word.translation = self.get_translation()
word.example = self.get_example()
self.listBox.curselection() = self.get_word()
self.read_only_ON()
else:
messagebox.showinfo('Notification', 'You have not selected any word!')
self.save_all()
self.word_count()
应用程序无法启动，因为：
/usr/bin/python3.5 /home/cali/PycharmProjects/Vocabulary/Vocabulary.py
File "/home/cali/PycharmProjects/Vocabulary/Vocabulary.py", line 232
self.listBox.curselection() = self.get_word()
^
SyntaxError: can't assign to function call
Process finished with exit code 1
此外，当我注释掉该行时，我收到另一个错误：
/usr/bin/python3.5 /home/cali/PycharmProjects/Vocabulary/Vocabulary.py
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python3.5/tkinter/__init__.py", line 1553, in __call__
return self.func(*args)
File "/home/cali/PycharmProjects/Vocabulary/Vocabulary.py", line 227, in save_item
word.wordorphrase = self.get_word()
AttributeError: 'NoneType' object has no attribute 'wordorphrase'
有人能帮助我吗？我不知道如何访问：
listView1.SelectedItems[0].Text
此外，如果您查看我的整个代码，它可能会有所帮助：
# Vocabulary.py
# GUI program to manage unknown words
from tkinter import *
from tkinter import ttk
from tkinter import messagebox
import xml.etree.ElementTree as ET
import os
class Word:
def __init__(self, wordorphrase = None, explanation = None, translation = None, example = None):
self.wordorphrase = wordorphrase
self.explanation = explanation
self.example = example
self.translation = translation
class Vocabulary(Frame):
def __init__(self, master):
Frame.__init__(self, master)
self.master = master
self.master.resizable(width = False, height = False)
self.master.title('Vocabulary')
self.create_widgets()
self.words = []
self.load_words()
def on_closing(self):
self.save_all()
if messagebox.askokcancel("Quit", "Do you want to quit?"):
self.master.destroy()
def create_widgets(self):
self.buttons_frame = Frame(self.master)
self.buttons_frame.grid(row = 10, sticky = W)
self.search_frame = Frame(self.master)
self.search_frame.grid(row = 1, sticky = W, columnspan = 2)
self.comboBox = ttk.Combobox(self.search_frame,
width = 3)
self.comboBox.grid(row = 0, column = 14, sticky = W)
self.comboBox['values'] = ( 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' )
self.btn_Add = Button(self.buttons_frame,
text = 'Add',
command = self.add_item)
self.btn_Add.grid(row = 0, sticky = W)
self.btn_Remove = Button(self.buttons_frame,
text = 'Remove',
command = self.remove_item)
self.btn_Remove.grid(row = 0, column = 1, sticky = W)
self.btn_Edit = Button(self.buttons_frame,
text = 'Edit',
command = self.edit_item)
self.btn_Edit.grid(row = 0, column = 2, sticky = W)
self.btn_Save = Button(self.buttons_frame,
text = 'Save',
command = self.save_item)
self.btn_Save.grid(row = 0, column = 3, sticky = W)
self.btn_Refresh = Button(self.buttons_frame,
text = 'Refresh',
command = self.refresh_all)
self.btn_Refresh.grid(row = 0, column = 4, sticky = W)
self.lblSearch = Label(self.search_frame, text = 'SEARCH: ')
self.lblSearch.grid(row = 0, column = 5, sticky = W)
self.txt_Search = Text(self.search_frame,
height = 1,
width = 70)
self.txt_Search.grid(row = 0, column = 6, columnspan = 3, sticky = W)
self.lblWordsOrPhrases = Label(self.master, text = 'WORDS/PHRASES:')
self.lblWordsOrPhrases.grid(row = 2, column = 0)
self.lblWordOrPhrase = Label(self.master, text = 'Word or phrase:')
self.lblWordOrPhrase.grid(row = 2, column = 1, sticky = W)
self.listBox = Listbox(self.master,
selectmode='extended',
height = 34,
width = 38)
self.listBox.grid(row = 3, column = 0, rowspan = 7, sticky = W)
self.listBox.bind('<<ListboxSelect>>', self.selectedIndexChanged)
self.txt_WordOrPhrase = Text(self.master,
height = 1,
width = 40)
self.txt_WordOrPhrase.grid(row = 3, column = 1, sticky = N)
self.lblExplanation = Label(self.master, text = 'Explanation:')
self.lblExplanation.grid(row = 4, column = 1, sticky = W)
self.txt_Explanation = Text(self.master,
height = 10,
width = 40)
self.txt_Explanation.grid(row = 5, column = 1, sticky = N)
self.lblTranslation = Label(self.master, text = 'Translation:')
self.lblTranslation.grid(row = 6, column = 1, sticky = W)
self.txt_Translation = Text(self.master,
height = 10,
width = 40)
self.txt_Translation.grid(row = 7, column = 1, sticky = N)
self.lblExamples = Label(self.master, text = 'Example(s):')
self.lblExamples.grid(row = 8, column = 1, sticky = W)
self.txt_Example = Text(self.master,
height = 10,
width = 40)
self.txt_Example.grid(row = 9, column = 1, sticky = S)
def load_words(self):
self.listBox.delete(0, END)
self.words.clear()
path = os.path.expanduser('~/Desktop')
vocabulary = os.path.join(path, 'Vocabulary', 'Words.xml')
if not os.path.exists(vocabulary):
if not os.path.exists(os.path.dirname(vocabulary)):
os.mkdir(os.path.dirname(vocabulary))
doc = ET.Element('Words')
tree = ET.ElementTree(doc)
tree.write(vocabulary)
else:
tree = ET.ElementTree(file=vocabulary)
for node in tree.findall('WordOrPhrase'):
w = Word(node.find('Word').text, node.find('Explanation').text, node.find('Translation').text,
node.find('Examples').text)
self.words.append(w)
self.listBox.insert(END, w.wordorphrase)
def save_all(self):
path = os.path.expanduser('~/Desktop')
vocabulary = os.path.join(path, 'Vocabulary', 'Words.xml')
tree = ET.ElementTree(file=vocabulary)
for xNode in tree.getroot().findall('WordOrPhrase'):
tree.getroot().remove(xNode)
for w in self.words:
xTop = ET.Element('WordOrPhrase')
xWord = ET.Element('Word')
xExplanation = ET.Element('Explanation')
xTranslation = ET.Element('Translation')
xExamples = ET.Element('Examples')
xWord.text = w.wordorphrase
xExplanation.text = w.explanation
xTranslation.text = w.translation
xExamples.text = w.example
xTop.append(xWord)
xTop.append(xExplanation)
xTop.append(xTranslation)
xTop.append(xExamples)
tree.getroot().append(xTop)
tree.write(vocabulary)
def add_item(self):
if len(self.listBox.curselection()) > 0:
messagebox.showinfo('Notification', 'Please make sure you have no words selected!')
elif self.txt_WordOrPhrase['state'] == 'disabled':
messagebox.showinfo('Notification', 'Please make sure you refresh fields first!')
else:
if len(self.txt_WordOrPhrase.get("1.0", "end-1c")) == 0:
messagebox.showinfo('Notification', 'Please enter the word!')
else:
w = Word(self.get_word(), self.get_explanation(), self.get_translation(), self.get_example())
if not any(x for x in self.words if x.wordorphrase == w.wordorphrase):
self.words.append(w)
self.listBox.insert(END, w.wordorphrase)
else:
messagebox.showinfo('Notification', 'That word already exists in your vocabulary!')
self.clear_all()
self.sync()
self.word_count()
self.save_all()
def remove_item(self):
for index in reversed(self.listBox.curselection()):
self.listBox.delete(index)
del self.words[index]
def edit_item(self):
if len(self.listBox.curselection()) > 0:
self.read_only_OFF()
else:
messagebox.showinfo('Notification', 'Nothing is selected!')
self.btn_Edit.config(state = 'disabled')
self.read_only_ON()
self.sync()
def save_item(self):
if len(self.listBox.curselection()) > 0:
word = self.find_word(self.listBox.curselection())
word.wordorphrase = self.get_word()
word.explanation = self.get_explanation()
word.translation = self.get_translation()
word.example = self.get_example()
#self.listBox.curselection() = self.get_word()
self.read_only_ON()
else:
messagebox.showinfo('Notification', 'You have not selected any word!')
self.save_all()
self.word_count()
def sync(self):
pass
def word_count(self):
pass
def clear_all(self):
self.txt_WordOrPhrase.delete('1.0', END)
self.txt_Explanation.delete('1.0', END)
self.txt_Translation.delete('1.0', END)
self.txt_Example.delete('1.0', END)
def refresh_all(self):
self.clear_all()
self.read_only_OFF()
self.btn_Edit.config(state = 'disabled')
self.word_count()
self.sync()
def get_word(self):
return self.txt_WordOrPhrase.get('1.0', '1.0 lineend')
def get_explanation(self):
return self.txt_Explanation.get('1.0', '1.0 lineend')
def get_translation(self):
return self.txt_Translation.get('1.0', '1.0 lineend')
def get_example(self):
return self.txt_Example.get('1.0', '1.0 lineend')
def find_word(self, word):
for x in self.words:
if x.wordorphrase == word:
return x
def selectedIndexChanged(self, event = None):
self.read_only_OFF()
selected = self.listBox.curselection()
if len(selected) == 0:
self.btn_Edit.config(state = 'disabled')
self.refresh_all()
return
try:
word = self.words[selected[0]]
self.clear_all()
self.txt_WordOrPhrase.insert(END, word.wordorphrase)
self.txt_Explanation.insert(END, word.explanation)
self.txt_Translation.insert(END, word.translation)
self.txt_Example.insert(END, word.example)
self.read_only_ON()
self.btn_Edit.config(state = 'normal')
except Exception:
return
def read_only_ON(self):
self.txt_WordOrPhrase.config(state = 'disabled')
self.txt_Explanation.config(state = 'disabled')
self.txt_Translation.config(state = 'disabled')
self.txt_Example.config(state = 'disabled')
def read_only_OFF(self):
self.txt_WordOrPhrase.config(state = 'normal')
self.txt_Explanation.config(state = 'normal')
self.txt_Translation.config(state = 'normal')
self.txt_Example.config(state = 'normal')
def main():
root = Tk()
gui = Vocabulary(root)
root.protocol('WM_DELETE_WINDOW', gui.on_closing)
root.mainloop()
if __name__ == '__main__':
main()
答案 0 :(得分：0)
以下是完整的解决方案：
def save_item(self):
if len(self.listBox.curselection()) > 0:
word = self.find_word(self.listBox.get(ACTIVE))
word.wordorphrase = self.get_word()
word.explanation = self.get_explanation()
word.translation = self.get_translation()
word.example = self.get_example()
word_index = self.listBox.curselection()[0]
self.listBox.delete(word_index)
self.listBox.insert(word_index, self.get_word())
self.read_only_ON()
else:
messagebox.showinfo('Notification', 'You have not selected any word!')
self.save_all()
self.word_count()