add with temporary_dir() example

context-managers.py

@@ -1,6 +1,13 @@
-from contextlib import contextmanager
-import os
+#!/usr/bin/env python2.7
 
+# Examples from:
+# https://stackoverflow.com/questions/3012488/what-is-the-python-with-statement-designed-for
+
+from contextlib import contextmanager
+from tempfile import mkdtemp
+
+import os
+import shutil
 
 @contextmanager
 def working_directory(path):
@@ -21,9 +28,30 @@ def just_a_test():
         print "finally!"
 
 
+
+
+@contextmanager
+def temporary_dir(*args, **kwds):
+    name = mkdtemp(*args, **kwds)
+    try:
+        yield name
+    finally:
+        shutil.rmtree(name)
+
+
+
 with working_directory("/tmp"), just_a_test():
     # do something within data/stuff
     print os.getcwd()
 
 # here I am back again in the original working directory
 print os.getcwd()
+
+
+with temporary_dir() as tmpdir:
+    print tmpdir
+    tmpfile = tmpdir + "/foo"
+    with open(tmpfile, "w") as f:
+        f.write("foo")
+
+# tmpdir is now gone