Python - ディレクトリ操作(os module, symlink method(シンボリックリンクの作成))

初めてのPerl 第6版
(オライリージャパン)
Randal L. Schwartz (著) brian d foy (著)
Tom Phoenix (著), 近藤 嘉雪 (翻訳)

開発環境

• OS X Mavericks - Apple(OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python (プログラミング言語)

初めてのPerl 第6版 (Randal L. Schwartz (著)、brian d foy (著)、Tom Phoenix (著)、近藤 嘉雪 (翻訳)、オライリージャパン)の13章(ディレクトリ操作)の13.13(練習問題)7.をPythonで考えてみる。

13.13(練習問題)7.

コード(BBEdit, Emacs)

sample290_7.py

#!/usr/bin/env python3
#-*- coding: utf-8

import os
import sys

if len(sys.argv) != 3:
    sys.exit()

src = sys.argv[1]
dst = sys.argv[2]

if os.path.isdir(dst):
    dst = os.path.join(dst, os.path.basename(src))

try:
    os.link(src, dst)
except:
    print(sys.exc_info())

入出力結果(Terminal)

$ ./sample290_7.py temp.txt temp1.txt
$ ls -l temp*.txt temp_dir
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp1.txt

temp_dir:
total 0
drwxr-xr-x   2 kamimura  staff   68 Jun  3 18:04 ./
drwxr-xr-x  12 kamimura  staff  408 Jun  3 18:05 ../
$ ./sample290_7.py -s temp.txt temp2.txt
$ ls -l temp*.txt temp_dir
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff  8 Jun  3 18:06 temp2.txt@ -> temp.txt

temp_dir:
total 0
drwxr-xr-x   2 kamimura  staff   68 Jun  3 18:04 ./
drwxr-xr-x  13 kamimura  staff  442 Jun  3 18:06 ../
$ ./sample290_7.py -s temp.txt temp_dir
$ ls -l temp*.txt temp_dir
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff  8 Jun  3 18:06 temp2.txt@ -> temp.txt

temp_dir:
total 8
drwxr-xr-x   3 kamimura  staff  102 Jun  3 18:06 ./
drwxr-xr-x  13 kamimura  staff  442 Jun  3 18:06 ../
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:06 temp.txt@ -> temp.txt
$ ./sample290_7.py -s temp.txt temp_dir/temp3.txt
$ ls -l temp*.txt temp_dir
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff  8 Jun  3 18:06 temp2.txt@ -> temp.txt

temp_dir:
total 16
drwxr-xr-x   4 kamimura  staff  136 Jun  3 18:07 ./
drwxr-xr-x  13 kamimura  staff  442 Jun  3 18:06 ../
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:06 temp.txt@ -> temp.txt
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:07 temp3.txt@ -> temp.txt
$ ./sample290_7.py  ./temp_dir/temp.txt .
(<class 'OSError'>, OSError(62, 'Too many levels of symbolic links'), <traceback object at 0x1039d97c8>)
$ ls -l temp*.txt temp_dir
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  2 kamimura  staff  0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff  8 Jun  3 18:06 temp2.txt@ -> temp.txt

temp_dir:
total 16
drwxr-xr-x   4 kamimura  staff  136 Jun  3 18:07 ./
drwxr-xr-x  13 kamimura  staff  442 Jun  3 18:06 ../
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:06 temp.txt@ -> temp.txt
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:07 temp3.txt@ -> temp.txt
$ ./sample290_7.py temp2.txt  temp_dir
$ ls -l temp*.txt temp_dir
-rw-r--r--  3 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  3 kamimura  staff  0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff  8 Jun  3 18:06 temp2.txt@ -> temp.txt

temp_dir:
total 16
drwxr-xr-x   5 kamimura  staff  170 Jun  3 18:07 ./
drwxr-xr-x  13 kamimura  staff  442 Jun  3 18:06 ../
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:06 temp.txt@ -> temp.txt
-rw-r--r--   3 kamimura  staff    0 May 20 14:16 temp2.txt
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:07 temp3.txt@ -> temp.txt
$ ./sample290_7.py ./temp_dir/temp2.txt  .
(<class 'FileExistsError'>, FileExistsError(17, 'File exists'), <traceback object at 0x10ab53808>)
$ ./sample290_7.py ./temp_dir/temp2.txt  temp3.txt
$ ls -l temp*.txt temp_dir
-rw-r--r--  4 kamimura  staff  0 May 20 14:16 temp.txt
-rw-r--r--  4 kamimura  staff  0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff  8 Jun  3 18:06 temp2.txt@ -> temp.txt
-rw-r--r--  4 kamimura  staff  0 May 20 14:16 temp3.txt

temp_dir:
total 16
drwxr-xr-x   5 kamimura  staff  170 Jun  3 18:07 ./
drwxr-xr-x  14 kamimura  staff  476 Jun  3 18:08 ../
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:06 temp.txt@ -> temp.txt
-rw-r--r--   4 kamimura  staff    0 May 20 14:16 temp2.txt
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:07 temp3.txt@ -> temp.txt
$ ./sample290_7.py -s ./temp_dir/temp2.txt  temp4.txt
$ ls -l temp*.txt temp_dir
-rw-r--r--  4 kamimura  staff   0 May 20 14:16 temp.txt
-rw-r--r--  4 kamimura  staff   0 May 20 14:16 temp1.txt
lrwxr-xr-x  1 kamimura  staff   8 Jun  3 18:06 temp2.txt@ -> temp.txt
-rw-r--r--  4 kamimura  staff   0 May 20 14:16 temp3.txt
lrwxr-xr-x  1 kamimura  staff  20 Jun  3 18:08 temp4.txt@ -> ./temp_dir/temp2.txt

temp_dir:
total 16
drwxr-xr-x   5 kamimura  staff  170 Jun  3 18:07 ./
drwxr-xr-x  15 kamimura  staff  510 Jun  3 18:08 ../
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:06 temp.txt@ -> temp.txt
-rw-r--r--   4 kamimura  staff    0 May 20 14:16 temp2.txt
lrwxr-xr-x   1 kamimura  staff    8 Jun  3 18:07 temp3.txt@ -> temp.txt
$