added persistance / serialization

Author: PythonCHB

_downloads/CircularReferenceExample.ipynb

@@ -18,9 +18,9 @@
 
 class MyChild(object):
     def __init__(self, parent):
-        self.parent = parent
+        #self.parent = parent
         # if a weak ref is used, then no memory leak.
-        #self.parent = weakref.proxy(parent)
+        self.parent = weakref.proxy(parent)
 
         ## store some data so it will use appreciable memory
         ## multiply by 1234 to reduce interning
@@ -55,4 +55,4 @@ def __del__(self):
         print "ref count:", sys.getrefcount(p)
         print "mem_use: %f MB"%mem_check.get_mem_use()
         del p
-        gc.collect()
+        print "collected", gc.collect()

_downloads/memcount.py

@@ -3,14 +3,15 @@ In This Collection
 
 .. ifslides::
 
-    +----------------------+
-    | Topics:              |
-    +======================+
-    | .. toctree::         |
-    |     :maxdepth: 1     |
-    |                      |
-    |     weak_references  |
-    +----------------------+
+    +-------------------------------+
+    | Topics:                       |
+    +===============================+
+    | .. toctree::                  |
+    |     :maxdepth: 1              |
+    |                               |
+    |     weak_references           |
+    |     persistance_serialization |
+    +-------------------------------+
 
 .. ifnotslides::
 
@@ -21,6 +22,7 @@ In This Collection
         :maxdepth: 1
 
         weak_references
+        persistance_serialization
 
 .. rst-class:: credit