为什么Python的read_history_文件不允许我进行操作？

Question

所以。我拥有名为~/.osc_history的文件，如下所示：

$ w
17:53  up  3:15, 5 users, load averages: 1.30 1.17 1.10
USER     TTY      FROM              LOGIN@  IDLE WHAT
kyma     console  -                14:39    3:14 -
kyma     s001     -                17:20       - w

$ ls -l ~/.osc_history 
-rw-r--r--  1 kyma  staff  13 Mar  6 17:41 /Users/kyma/.osc_history

$ ls -lO ~/.osc_history 
-rw-r--r--  1 kyma  staff  - 13 Mar  6 17:41 /Users/kyma/.osc_history

文件中的标头正确：

^{pr2}$

在交互式提示符下，以下代码运行良好：

$ python
Python 2.7.10 (default, Jul 30 2016, 19:40:32) 
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os.path
>>> import readline
>>> histfile = os.path.join(os.path.expanduser("~"), ".osc_history")
>>> histfile
'/Users/kyma/.osc_history'
>>> readline.read_history_file(histfile)
>>> ^D

但是，当我试图运行以下程序时，我称之为“yeuch.py公司"... 在

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import readline                 # Command line history
import os.path

histfile = os.path.join(os.path.expanduser("~"), ".osc_history")
if not os.path.isfile(histfile):     # If there's no history file...
    empty = open(histfile, "a")      # ... create an ALMOST empty one...
    empty.write("_HiStOrY_V2_\n")    # ... with the special header line
    empty.close()
readline.read_history_file(histfile) # Read history from previous sessions
readline.set_history_length(1000)    # Default length was -1 (infinite)

……我明白了：

$ python yeuch.py
Traceback (most recent call last):
  File "yeuch.py", line 14, in <module>
    readline.read_history_file(histfile) # Read history from previous sessions
IOError: [Errno 1] Operation not permitted

怎么回事？（我希望我没有多次忽略一些愚蠢的打字错误…）