Added listinherited.py

progrmoiz · progrmoiz · commit 99097ed2f689 · 2017-12-04T14:03:43.000+05:00
diff --git a/README.md b/README.md
@@ -21,6 +21,7 @@
 - [timer3.py](timer3.py) Homegrown timing tools for function calls.
 - [classtree.py](classtree.py) Climb inheritance tree using namespace links, displaying higher superclasses with indentation for height
 - [listinstance.py](listinstance.py)  Mix-in class that provides a formatted print() or str()
+- [listinherited.py](listinherited.py) Mix-in class that provides a formatted print() or str() (Use dir() to collect both instance attr and names inherited from its classes)
 
 ---
 
diff --git a/listinherited.py b/listinherited.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+# File listinherited.py (2.x + 3.x)
+
+
+class ListInherited:
+    """
+    Use dir() to collect both instance attr and names inherited from
+    its classes; Python 3.x shows more name than 2.x because of the
+    implied object superclass in the new-style class model; getattr()
+    fetches inherited names not in self.__dict__; user __str__, not
+    __repr__, or else the loops when printing bound method!
+    """
+
+    def __attrname(self):
+        result = ''
+        for attr in dir(self):  # instance dir
+            if attr[:2] == '__' and attr[-2:] == '__':
+                result += '\t%s\n' % attr
+            else:
+                result += '\t%s=%s\n' % (attr, getattr(self, attr))
+        return result
+
+    def __str__(self):
+        return '<Instance of %s, address %s:\n%s>' % (
+            self.__class__.__name__,
+            id(self),           # My address
+            self.__attrname())  # name=value list
+
+
+def tester(listerclass, sept=False):
+
+    class Super:
+
+        def __init__(self):
+            self.data1 = 'spam'
+
+        def ham(self):
+            pass
+
+    class Sub(Super, listerclass):
+
+        def __init__(self):
+            Super.__init__(self)
+            self.data2 = 'eggs'
+            self.data3 = 42
+
+        def spam(self):
+            pass
+
+    instance = Sub()
+    print(instance)
+    if sept:
+        print('-' * 80)
+
+
+if __name__ == '__main__':
+
+    tester(ListInherited)
