我有一个用C＃编写的应用程序，需要转换为Python，因为我最近切换到了Linux。这是一个简单的GUI应用程序，用于在学习新语言的同时管理未知单词。不过，我需要 remove_item（）函数，我还需要 find_word（）函数。
在C＃中，我将创建以下两种方法：
void Remove()
{
Word word = new Word();
try { word = FindWord(listView1.SelectedItems[0].Text); }
catch { return; }
if (listView1.SelectedItems.Count > 0)
{
try
{
foreach (ListViewItem eachItem in listView1.SelectedItems)
{
words.RemoveAll(x => x.WordOrPhrase == eachItem.Text);
listView1.Items[listView1.Items.Count - 1].Selected = true;
listView1.Items.Remove(eachItem);
}
}
catch { }
ClearAll();
ReadOnlyON();
}
else
{
MessageBox.Show("You have not selected any words!", "Notification", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
ReadOnlyOFF();
WordCount();
Sync();
}
private Word FindWord(string word)
{
return words.Find(x => x.WordOrPhrase == word);
}
...但是当涉及到Python时，我仍然是新手，所以任何帮助都会受到赞赏。以下是我到目前为止的情况：
对于FindWord（）方法，可以将其重写为：
def FindWord(word):
for x in words:
if x.WordOrPhrase == word:
return x
或
def FindWord(word):
return next((x for x in words if x.WordOrPhrase == word), None)
或
def FindWord(word):
return next(filter(lambda x: x.WordOrPhrase == word, words), None)
...但我正在努力重写Remove（）方法。这是一种方式：
def remove_item(self):
word = self.listBox.get(ACTIVE)
new_word_list = [] # initialize empty list
delete_idxs = []
for idx, item in enumerate(self.words):
if item.wordorphrase == word:
delete_idxs.append(idx)
else:
new_word_list.append(item)
self.words = new_word_list # overwrite the old word_list with the new one
for idx in reversed(delete_idxs):
self.listBox.delete(idx)
...我最想要的是将我的C＃方法转换为Python。以下是我到目前为止的情况：
def remove_item(self):
word = Word()
try:
word = find_word(self.listBox.curselection())
except:
return
if self.listBox.len(curselection()) > 0:
try:
for item in self.listBox.curselection():
self.words.remove(lambda x: x.wordorphrase == item.text)
# listView1.Items[listView1.Items.Count - 1].Selected = true;
self.listBox.remove(item)
except:
pass
self.clear_all()
else:
pass
# show messagebox
我不知道如何访问：
listView1.SelectedItems[0].Text listView1.SelectedItems.Count > 0 listView1.SelectedItems listView1.Items[listView1.Items.Count - 1].Selected 这是我到目前为止所做的：
# 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, explanation, translation, example):
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.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):
w = Word(self.get_word(), self.get_explanation(), self.get_translation(), self.get_example())
self.words.append(w)
self.listBox.insert(END, w.wordorphrase)
self.clear_all()
self.save_all()
def remove_item(self):
word = Word()
try:
word = find_word(self.listBox.curselection())
except:
return
if self.listBox.len(curselection()) > 0:
try:
for item in self.listBox.curselection():
self.words.remove(lambda x: x.wordorphrase == item.text)
# listView1.Items[listView1.Items.Count - 1].Selected = true;
self.listBox.remove(item)
except:
pass
self.clear_all()
else:
pass
# show messagebox
def edit_item(self):
pass
def save_item(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):
pass
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(word):
for x in self.words:
if x.wordorphrase == word:
return x
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)
对于我的列表框，我通常将模式设置为EXTENDED，以便用户可以选择一个或多个项目并一次删除所有项目。我通过以下方法这样做：
# Function with Tk.Listbox passed as arg
def remove_from(list_box):
# Tuple of currently selected items in arg
selected_items = list_box.curselection()
# Initialize a 'repositioning' variable
pos = 0
for item in selected_items:
# Set index of each item selected
idx = int(item) - pos
# Deletes only that index in the listbox
list_box.delete(idx, idx)
# Increments to account for shifts
pos += 1
例如，让我说在我的列表框中我有4个项目。然后我选择第一项和第三项。致电list_box.curselection()我收到以下内容：
selected_items = (0, 2)
0是列表框中第一个项目的位置，2是第三个项目的位置。然后对于我的元组中的每个项目，我建立它的索引。
通过此步骤，对于第一个项目，发生以下事项：
idx = 0 - 0
list_box.delete(0, 0)
pos = 1
所以现在我删除了0位置的项目（例如第一项），我的列表框已经移位了！所以第二个现在是第一个，第三个是第二个，第四个是第三个。但是，我的元组没有改变，因为它是原始选项的列表框中的位置。这是关键。接下来会发生什么：
idx = 2 - 1
list_box.delete(1, 1)
pos = 2
由于列表框已移位，因此位置1现在对应于最初位于列表框第三个位置的项目。这可以继续n个职位。
自我删除
您可以尝试以下方法：
# Function with Tk.Listbox and self.words[] passed as args
def remove_from(list_box, list):
# Tuple of currently selected items in arg
selected_items = list_box.curselection()
# List of Words already constructed
word_list = list
# Initialize a 'repositioning' variable
pos = 0
for item in selected_items:
# Set index of each item selected
idx = int(item) - pos
# Deletes only that index in the listbox
list_box.delete(idx, idx)
# Gets the string value of the given index
word = list_box.get(idx, idx)
# Removes the word from the list
if any(word in x for x in word_list):
word_list.remove(word)
# Increments to account for shifts
pos += 1