* Introducing "Struct", the base class for all structured datatypes.

This is the original implementation as found in Ca+4H2_Hstorage_iter.py .

params/params_struct.py

@@ -0,0 +1,49 @@
+# $Id: params_struct.py,v 1.1 2011-03-10 17:17:48 wirawan Exp $
+#
+# wpylib.params.params_struct module
+# Created: 20110310
+# Wirawan Purwanto
+#
+"""
+params_struct.py
+
+This module hosts `Struct', the simplest structured datatype,
+which in python is basically the same as dict.
+However this syntactic sugar will make your code very much like other
+high-level language (less mess with a['member'] kind of thing).
+Also this class will allow us to provide a base class to more specialized
+classes of similar nature.
+
+Other classes that are similar in purpose:
+
+* wpylib.params.params_flat.Parameters
+  For assisting parameter lookup in functions.
+
+* wpylib.db.result_base
+  For storing result from program output file.
+
+
+
+CHARACTERISTICS/USAGE PATTERN
+
+* Just like dict, it does not enforce a particular structure.
+* Use words only as keys (i.e. keys are valid python identifiers).
+* Do not prepend and append two underscores at the same time.
+
+
+"""
+
+
+class Struct(object):
+  """A simplistic structured datatype.
+  No particular structure is assumed.
+  Results are fetchable by either X.member or X['member'] syntax.
+  Limited dict-like operations are supported."""
+  def __getitem__(self, item):
+    if hasattr(self, item):
+      return getattr(self, item)
+    else:
+      raise KeyError, "Invalid result name: %s" % (item)
+  def __contains__(self, item):
+    #return item in dir(self)
+    return hasattr(self, item)