Python函数在传递字符串变量时返回空列表

Question

我正在使用自动填充文本编辑器。当用户按下空格时，它会接收用户的输入并打印带有用户提到的前缀的单词列表。

下面是代码：

#!/usr/bin/env python 

from tkinter import * 
import tkinter.font as tkFont 


class Node: 
    def __init__(self): 
     self.word = None 
     self.nodes = {} # dict of nodes 

    def __get_all__(self): 
     x = [] 

     for key, node in self.nodes.items(): 
      if (node.word is not None): 
       x.append(node.word) 

      x = x + node.__get_all__ 

     return x 

    def __str__(self): 
     return self.word 

    def __insert__(self, word, string_pos=0): 
     current_letter = word[string_pos] 

     if current_letter not in self.nodes: 
      self.nodes[current_letter] = Node(); 
     if (string_pos + 1 == len(word)): 
      self.nodes[current_letter].word = word 
     else: 
      self.nodes[current_letter].__insert__(word, string_pos + 1) 

      return True 

    def __get_all_with_prefix__(self, prefix, string_pos): 
     x = [] 
     #print("We are in the get prefix func", prefix) 

     for key, node in self.nodes.items(): 
      if (string_pos >= len(prefix) or key == prefix[string_pos]): 
       if (node.word is not None): 
        x.append(node.word) 

       if (node.nodes != {}): 
        if (string_pos + 1 <= len(prefix)): 
         x = x + node.__get_all_with_prefix__(prefix, string_pos + 1) 
        else: 
         x = x + node.__get_all_with_prefix__(prefix, string_pos) 

     return x 


class Trie: 
    def __init__(self): 
     self.root = Node() 

    def insert(self, word): 
     self.root.__insert__(word) 

    def get_all(self): 
     return self.root.__get_all__ 

    def get_all_with_prefix(self, prefix, string_pos=0): 
     return self.root.__get_all_with_prefix__(prefix, string_pos) 


root = Tk() 
trie = Trie() 
customFont = tkFont.Font(family="arial", size=17) 

with open('words_file_for_testing.txt', mode='r') as f: 
    for line in f: 
     for word in line.split(): 
      trie.insert(word) 


def retrieve_input(self): 
    inputValue = content_text.get("1.0", "end-1c") 
    print(trie.get_all_with_prefix(inputValue)) 
    printing_the_list(inputValue) 

def printing_the_list(getinputvalue): 
    print(getinputvalue) 
    print(type(getinputvalue)) 
    print(trie.get_all_with_prefix("A")) 
    print(trie.get_all_with_prefix(getinputvalue)) 
    #print(type(words)) 
    #print(words) 
    #print(trie.get_all_with_prefix("A")) 
    #master = Tk() 
    #listbox = Listbox(master) 
    #listbox.pack() 
    #for item in words: 
    # listbox.insert(END, item) 

root.title("Autocomplete Word") 
root.geometry('800x400+150+200') 
content_text = Text(root, wrap='word', font=customFont) 
content_text.focus_set() 
content_text.pack(expand='yes', fill='both') 
scroll_bar = Scrollbar(content_text) 
content_text.configure(yscrollcommand=scroll_bar.set) 
scroll_bar.config(command=content_text.yview) 
scroll_bar.pack(side='right', fill='y') 
root.bind("<space>", retrieve_input) 
root.mainloop() 

现在，我有问题，其printing_the_list(getinputvalue)功能。在此功能中，getinputvalue是存储用户输入值的变量。当我手动输入字符串到print(trie.get_all_with_prefix("A"))函数时，它会根据需要打印单词列表，但是，当我尝试使用getinputvalue变量打印具有用户输入值的单词的前缀列表时，获得了一个空列表[]。

上面的Python代码打印：

[] 
A 
<class 'str'> 
['AAE', 'AAEE', 'AAG', 'AAF', 'AAP', 'AAPSS', 'AAM', 'AAMSI', 'AARC', 'AAII', 'AAO', 'Aar', 'Aaron', 'Aarika', 'Aargau', 'Aaren', 'Aarhus', 'Aara', 'Aarau', 'Aandahl', 'Aani', 'Aaqbiye', 'Aalesund', 'Aalto', 'Aalborg', 'Aalst', 'Aachen', 'A-and-R'] 
[] 

我在做什么错。

Answer 1

你的问题是，当你键入一个和然后按空间

inputValue = content_text.get("1.0", "end-1c") 

回报'A '代替'A'。

这是因为content_text.get()adds a new line character在字符串的末尾。要忽略这两个换行符，空间，用途：

inputValue = content_text.get("1.0", "end-2c")