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diff --git a/pypers/oxford/interp.py b/pypers/oxford/interp.py
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+# interp.py
+
+import UserDict
+
+class Chainmap(UserDict.DictMixin):
+    """Combine multiple mappings for sequential lookup. Raymond Hettinger,
+    http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/305268 """
+
+    def __init__(self, *maps):
+        self._maps = maps
+
+    def __getitem__(self, key):
+        for mapping in self._maps:
+            try:
+                return mapping[key]
+            except KeyError:
+                pass
+        raise KeyError(key)
+
+
+
+import sys
+from string import Template
+
+def interp(text, repldic=None, safe_substitute=True):
+    caller = sys._getframe(1)
+    if repldic:
+        mapping = Chainmap(repldic, caller.f_locals, caller.f_globals)
+    else:
+        mapping = Chainmap(caller.f_locals, caller.f_globals)
+    t  = Template(text)
+    if safe_substitute:
+        return t.safe_substitute(mapping)
+    else:
+        return t.substitute(mapping)
+   
+## Example:
+
+language="Python"
+
+def printmsg():
+    opinion = "favorite"
+    print interp("My $opinion language is $language.")
+
+