From 206aec57e4da0a6ea31e9fca6fbb23bfa6f56ded Mon Sep 17 00:00:00 2001
From: Corey Schafer <CoreyMSchafer@gmail.com>
Date: Tue, 19 Dec 2017 21:43:13 -0700
Subject: [PATCH] Python Context Managers code snippets

---
 .../Sample-Dir-One/mydoc.txt                  |  0
 .../Sample-Dir-One/todo.txt                   |  0
 .../Sample-Dir-One/work.txt                   |  0
 .../Sample-Dir-Two/demo.txt                   |  0
 .../Sample-Dir-Two/sample.txt                 |  0
 .../Sample-Dir-Two/test.txt                   |  0
 Python-Context-Managers/cm_demo.py            | 19 +++++++++
 Python-Context-Managers/sample.txt            |  1 +
 Python-Context-Managers/snippets.txt          | 41 +++++++++++++++++++
 9 files changed, 61 insertions(+)
 create mode 100644 Python-Context-Managers/Sample-Dir-One/mydoc.txt
 create mode 100644 Python-Context-Managers/Sample-Dir-One/todo.txt
 create mode 100644 Python-Context-Managers/Sample-Dir-One/work.txt
 create mode 100644 Python-Context-Managers/Sample-Dir-Two/demo.txt
 create mode 100644 Python-Context-Managers/Sample-Dir-Two/sample.txt
 create mode 100644 Python-Context-Managers/Sample-Dir-Two/test.txt
 create mode 100644 Python-Context-Managers/cm_demo.py
 create mode 100644 Python-Context-Managers/sample.txt
 create mode 100644 Python-Context-Managers/snippets.txt

diff --git a/Python-Context-Managers/Sample-Dir-One/mydoc.txt b/Python-Context-Managers/Sample-Dir-One/mydoc.txt
new file mode 100644
index 0000000..e69de29
diff --git a/Python-Context-Managers/Sample-Dir-One/todo.txt b/Python-Context-Managers/Sample-Dir-One/todo.txt
new file mode 100644
index 0000000..e69de29
diff --git a/Python-Context-Managers/Sample-Dir-One/work.txt b/Python-Context-Managers/Sample-Dir-One/work.txt
new file mode 100644
index 0000000..e69de29
diff --git a/Python-Context-Managers/Sample-Dir-Two/demo.txt b/Python-Context-Managers/Sample-Dir-Two/demo.txt
new file mode 100644
index 0000000..e69de29
diff --git a/Python-Context-Managers/Sample-Dir-Two/sample.txt b/Python-Context-Managers/Sample-Dir-Two/sample.txt
new file mode 100644
index 0000000..e69de29
diff --git a/Python-Context-Managers/Sample-Dir-Two/test.txt b/Python-Context-Managers/Sample-Dir-Two/test.txt
new file mode 100644
index 0000000..e69de29
diff --git a/Python-Context-Managers/cm_demo.py b/Python-Context-Managers/cm_demo.py
new file mode 100644
index 0000000..823866a
--- /dev/null
+++ b/Python-Context-Managers/cm_demo.py
@@ -0,0 +1,19 @@
+import os
+from contextlib import contextmanager
+
+
+@contextmanager
+def change_dir(destination):
+    try:
+        cwd = os.getcwd()
+        os.chdir(destination)
+        yield
+    finally:
+        os.chdir(cwd)
+
+
+with change_dir('Sample-Dir-One'):
+    print(os.listdir())
+
+with change_dir('Sample-Dir-Two'):
+    print(os.listdir())
diff --git a/Python-Context-Managers/sample.txt b/Python-Context-Managers/sample.txt
new file mode 100644
index 0000000..d863439
--- /dev/null
+++ b/Python-Context-Managers/sample.txt
@@ -0,0 +1 @@
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
\ No newline at end of file
diff --git a/Python-Context-Managers/snippets.txt b/Python-Context-Managers/snippets.txt
new file mode 100644
index 0000000..3d64909
--- /dev/null
+++ b/Python-Context-Managers/snippets.txt
@@ -0,0 +1,41 @@
+
+class Open_File():
+
+    def __init__(self, destination):
+        pass
+
+    def __enter__(self):
+        pass
+
+    def __exit__(self, exc_type, exc_val, traceback):
+        pass
+
+
+#### Using contextlib ####
+
+@contextmanager
+def open_file(file, mode):
+    f = open(file, mode)
+    yield f
+    f.close()
+
+
+with open_file('sample.txt', 'w') as f:
+    f.write('Lorem ipsum dolor sit amet, consectetur adipiscing elit.')
+
+print(f.closed)
+
+
+#### CD Example ####
+
+cwd = os.getcwd()
+os.chdir('Sample-Dir-One')
+print(os.listdir())
+os.chdir(cwd)
+
+cwd = os.getcwd()
+os.chdir('Sample-Dir-Two')
+print(os.listdir())
+os.chdir(cwd)
+
+