I'm going thru the online zope book (2.6) and trying out the simple interest rate calculator web application under the section: Creating a Basic Zope Application Using Page Templates and Scripts http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/BasicObject. stx I'll attach the error log: Time 2009/01/13 09:57:11.072 US/Central User Name (User Id) admin (admin) Request URL http://localhost:8080/interest/interestRateDisplay Exception Type AttributeError Exception Value calculateCompoundingInterest Traceback (innermost last): * Module ZPublisher.Publish, line 119, in publish * Module ZPublisher.mapply, line 88, in mapply * Module ZPublisher.Publish, line 42, in call_object * Module Shared.DC.Scripts.Bindings, line 313, in __call__ * Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec * Module Products.PageTemplates.ZopePageTemplate, line 330, in _exec * Module Products.PageTemplates.ZopePageTemplate, line 427, in pt_render * Module Products.PageTemplates.PageTemplate, line 89, in pt_render * Module zope.pagetemplate.pagetemplate, line 117, in pt_render * Module zope.tal.talinterpreter, line 271, in __call__ * Module zope.tal.talinterpreter, line 346, in interpret * Module zope.tal.talinterpreter, line 623, in do_insertText_tal * Module Products.PageTemplates.Expressions, line 228, in evaluateText * Module zope.tales.tales, line 696, in evaluate URL: /interest/interestRateDisplay Line 10, Column 4 Expression: <PythonExpr here.calculateCompoundingInterest(principal, interest_rate, periods, years)> Names: * {'container': <Folder at /interest>, * 'context': <Folder at /interest>, * 'default': <object object at 0x0071C528>, * 'here': <Folder at /interest>, * 'loop': {}, * 'nothing': None, * 'options': {'args': ()}, * 'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x06EB1A08>, * 'request': <HTTPRequest, URL=http://localhost:8080/interest/interestRateDisplay>, * 'root': <Application at >, * 'template': <ZopePageTemplate at /interest/interestRateDisplay>, * 'traverse_subpath': [], 'user': <PropertiedUser 'admin'>} * Module Products.PageTemplates.ZRPythonExpr, line 49, in __call__ __traceback_info__: here.calculateCompoundingInterest(principal, interest_rate, periods, years) * Module PythonExpr, line 1, in <expression> AttributeError: calculateCompoundingInterest form interest_rate 12.0 years 12 periods 4 principal 20000.0 Does this indicate an error with my python script? Joseph Thomas College of American Pathologists http://www.cap.org <http://www.cap.org/> Consider our environment; please print this e-mail only if truly necessary. Thank you!