From c7b87b749dfde42bc3406b466ffe181e487df112 Mon Sep 17 00:00:00 2001
From: rasbt <se.raschka@me.com>
Date: Sun, 1 Dec 2013 00:26:24 -0500
Subject: [PATCH] file ops

---
 file_browsing.py | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 file_browsing.py

diff --git a/file_browsing.py b/file_browsing.py
new file mode 100644
index 0000000..2ea522d
--- /dev/null
+++ b/file_browsing.py
@@ -0,0 +1,68 @@
+# File system operations using Python
+# sr 11/30/2013
+
+
+import os
+import shutil
+
+# working directory
+c_dir = os.getcwd()                 # show current working directory
+os.listdir(c_dir)                   # shows all files in the working directory
+os.chdir('~/Data')                  # change working directory
+
+
+
+# walk
+tree = os.walk(c_dir)      
+# moves through sub directories and creates a 'generator' object of tuples
+# ('dir', [file1, file2, ...] [subdirectory1, subdirectory2, ...]), 
+#    (...), ...
+
+
+
+#check files: returns either True or False
+os.exists('../rel_path')
+os.exists('/home/abs_path')
+os.isfile('./file.txt')
+os.isdir('./subdir')
+
+
+
+# file permission (True or False
+os.access('./some_file', os.F_OK) # File exists? Python 2.7
+os.access('./some_file', os.R_OK) # Ok to read? Python 2.7
+os.access('./some_file', os.W_OK) # Ok to write? Python 2.7
+os.access('./some_file', os.X_OK) # Ok to execute? Python 2.7
+os.access('./some_file', os.X_OK | os.W_OK) # Ok to execute or write? Python 2.7
+
+
+
+# join (creates operating system dependent paths)
+os.path.join('a', 'b', 'c')
+# 'a/b/c' on Unix/Linux
+# 'a\\b\\c' on Windows
+os.path.normpath('a/b/c') # converts file separators
+
+
+
+# os.path: direcory and file names
+os.path.samefile('./some_file', '/home/some_file')  # True if those are the same
+os.path.dirname('./some_file')  # returns '.' (everythin but last component)
+os.path.basename('./some_file') # returns 'some_file' (only last component
+os.path.split('./some_file') # returns (dirname, basename) or ('.', 'some_file)
+os.path.splitext('./some_file.txt') # returns ('./some_file', '.txt')
+os.path.splitdrive('./some_file.txt') # returns ('', './some_file.txt')
+os.path.isabs('./some_file.txt') # returns False (not an absolute path)
+os.path.abspath('./some_file.txt')
+
+
+# create and delete files and directories
+os.mkdir('./test')  # create a new direcotory
+os.rmdir('./test')  # removes an empty direcotory
+os.removedirs('./test') # removes nested empty directories
+os.remove('file.txt')   # removes an individual file
+shutil.rmtree('./test') # removes directory (empty or not empty)
+
+os.rename('./dir_before', './renamed') # renames directory if destination doesn't exist
+shutil.move('./dir_before', './renamed') # renames directory always
+