在python3中使用readline自动完成

Question

我试图用这个漂亮的技巧here来处理一个csv文件。虽然我似乎无法使用python3自动完成工作。我不知道从readline开始。文件有点密集。我的猜测是，我错过了Python 2中没有raw_input()的东西。

我粘贴了下面的我的尝试。当我在shell中，并且我点击标签时，我只会看到大标签并且没有自动完成操作。我的意图是，下面的输入语句自动完成字符串['10/10/2013', '10/13/2013', '10/14/2013', '10/15/2013']。

我错过了什么？

import readline 

class MyCompleter(object): # Custom completer 

    def __init__(self, options): 
     self.options = sorted(options) 

    def complete(self, text, state): 
     if state == 0: # on first trigger, build possible matches 
      if text: # cache matches (entries that start with entered text) 
       self.matches = [s for s in self.options 
            if s and s.startswith(text)] 
      else: # no text entered, all matches possible 
       self.matches = self.options[:] 

     # return match indexed by state 
     try: 
      return self.matches[state] 
     except IndexError: 
      return None 


dates = [ 
    '10/10/2013 13:03:51', 
    '10/10/2013 13:54:32', 
    '10/10/2013 18:48:48', 
    '10/10/2013 19:13:00', 
    '10/13/2013 12:58:17', 
    '10/13/2013 13:38:15', 
    '10/13/2013 16:48:58', 
    '10/13/2013 17:23:59', 
    '10/13/2013 20:09:56', 
    '10/13/2013 21:54:14', 
    '10/13/2013 21:57:43', 
    '10/13/2013 22:47:40', 
    '10/14/2013 13:32:53', 
    '10/14/2013 21:14:51', 
    '10/15/2013 10:18:23' 
    ] 

dates = [x.split(' ')[0] for x in dates] 

completer = MyCompleter(list(set(dates))) 
readline.set_completer(completer.complete) 
readline.parse_and_bind('tab: complete') 
date = input('Enter a date in m/d/yy format\n\t') 

更新：下面的答案很好，但在OS X上仍然存在问题。我甚至不知道从哪里开始排除故障。我在Ubuntu上获得了这个自动完成功能，但是它在我的OS X系统上不会绑定到tab。

Answer 1

修正版本：

from __future__ import print_function 

import sys 
import readline 
from os import environ 


class MyCompleter(object): # Custom completer 

    def __init__(self, options): 
     self.options = sorted(options) 

    def complete(self, text, state): 
     if state == 0: # on first trigger, build possible matches 
      if not text: 
       self.matches = self.options[:] 
      else: 
       self.matches = [s for s in self.options 
           if s and s.startswith(text)] 

     # return match indexed by state 
     try: 
      return self.matches[state] 
     except IndexError: 
      return None 

    def display_matches(self, substitution, matches, longest_match_length): 
     line_buffer = readline.get_line_buffer() 
     columns = environ.get("COLUMNS", 80) 

     print() 

     tpl = "{:<" + str(int(max(map(len, matches)) * 1.2)) + "}" 

     buffer = "" 
     for match in matches: 
      match = tpl.format(match[len(substitution):]) 
      if len(buffer + match) > columns: 
       print(buffer) 
       buffer = "" 
      buffer += match 

     if buffer: 
      print(buffer) 

     print("> ", end="") 
     print(line_buffer, end="") 
     sys.stdout.flush() 


dates = [ 
    '10/10/2013 13:03:51', 
    '10/10/2013 13:54:32', 
    '10/10/2013 18:48:48', 
    '10/10/2013 19:13:00', 
    '10/13/2013 12:58:17', 
    '10/13/2013 13:38:15', 
    '10/13/2013 16:48:58', 
    '10/13/2013 17:23:59', 
    '10/13/2013 20:09:56', 
    '10/13/2013 21:54:14', 
    '10/13/2013 21:57:43', 
    '10/13/2013 22:47:40', 
    '10/14/2013 13:32:53', 
    '10/14/2013 21:14:51', 
    '10/15/2013 10:18:23' 
    ] 

dates = [x.split(' ')[0] for x in dates] 

completer = MyCompleter(list(set(dates))) 
readline.set_completer_delims(' \t\n;') 
readline.set_completer(completer.complete) 
readline.parse_and_bind('tab: complete') 
readline.set_completion_display_matches_hook(completer.display_matches) 
print('Enter a date in m/d/yy format\n\t') 
date = input("> ") 

说明（S）：

• 添加自定义display_matches()（可能不适合你有用）
• 新增readline.set_completer_delims()调用，因为我们希望将/作为单词的一部分。

在Mac OS X