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The Prefect Python
by Jean-François Ménard 28 Aug '02

28 Aug '02

Just posted this on comp.lang.python. Maybe Zope developpers could have comments. ************** First, a warning: - I'm very poor in english. - I woke up way too early this morning. - It's a long post... (Sorry!) - I *love* python. This is not a troll, or anything like that. Ok. Here we go. I would like to share my impressions and my comments on Python. At the end, I will propose what would be for me the *perfect* Python interpreter. Background: I'm working on a fairly big Python (Zope) project since a year and a half. It's a content management system for a big (19 000 employees) entreprise. At first, I was the sole developper for the project. My orders were: "Ok, choose what you want, do what you want. We just want one thing: results..." Lucky, hey? ;) I had experience in Object Pascal (Delphi), Vb (...), C++ and Java. I was new in the company, and wanted to impress my bosses. After some research, I narrowed my choices to two options: EJB (Java) and Zope (Python). I gave a serious look at EJB, but in the end, I chose Python. I took a risk. I don't regret it. After only 2 months, I had already produced a working system. Alone... :) Opinions, impressions: At first, I was amazed by the simplicity and the clarity of the syntax. I *love* the indentation style. It gives clean and standardized source code. We are now three developpers on the project, and it's easy for anyone of us to understand the code of the others. But... As project grew up, I started to see some of the limitations of the language. I understand that Python was not designed for such big projects. But it's so powerfull, so clean, that I just wonder what Python could become with just some (ok, not so minors...) improvements. I understand that backward compatibility is important too, but the latests extensions to Python begin to seem locked by past decisions. I don't like this tendency to __this__ and __that__ everything. We loose in readability, accessibility and clarity, in my opinion... The Perfect Python (c): What is missing ? Well, I'm not a language designer, but I can say what *I* miss. - Interfaces. Behavior checking is not enough. - Private and Public scopes. Explicitly. No more __name_mangling - Design by contract. Pre and Post conditions. Could save hours of debugging. - Block comments. """ """ should be for documentation. - Class variables. - A cleaner Property declaration. No separate _variable. Saw too many newbie posts about that. - No more self in functions declarations. In OOP, this *can* be implicit. (I know, this is controversial stuff) - Standard GUI library. AnyGui seems to be the solution, but development seems to have stalled recently... I tried to write an example of what Perfect Python(c) could look like. It's not valid code (duh!), and it does'nt try to do anything unless give a sample syntax: ******************** from package1.package2 import module1, module2 public interface MyInterface implements (OtherInterface1, OtherInterface2): """ Comments """ private PrivateClassVariable public property MyProperty public MyFunction(param1, param2) public class MyClass(Class1, Class2) implements MyInterface, Interface2: """ Comments """ # Instance Variable private InstanceVariable = "Default" # Class Variable - Public by default static PublicClassVariable = "Default" # Class Variable - Private static private PrivateClassVariable = "Default" public initialize(param1, param2="", param3=None): """ Comments """ # OtherInstanceVariable is Public by default self.OtherInstanceVariable = "rien" # OtherInstanceVariable2 - Private private self.OtherInstanceVariable = "rien" private MyFunction(MyParameter1, MyParameter1): """ Comments """ return "Result" /* Block comment function Foo(): pass */ public property MyProperty: """ Comments """ get(): """ Comments """ return self.MyProperty set(newValue): """ Comments """ self.MyProperty = newValue private testInterface(otherObject): """ Interface checking """ # Check for interface implementation if otherObject implements MyInterface: return true # Check for multiple interface implementation if otherObject implements (OtherInterface1 or OtherInterface2): return true # Check for class inheritance if otherObject implements MyInterface: return true return false private testInheritence(otherObject): """ Inheritence checking """ # Check for class inheritance if otherObject implements Class1: return true private propertyCall(): """ Uniform call """ return self.MyProperty private propertySet(newValue): """ Uniform call """ self.MyProperty = "new value" public functionWithAssertion(Param1): """ Design by Contract """ require: """ Precondition """ Param1 < 1000000 do: """ Function body """ pass ensure: """ Poscondition """ Param1 < 1000000 ******************** I have no idea how this could be implemented. Maybe a PerfectPython interpretor could be developped on top of the standard interpretor? Any comments? Anybody interested to start the project? ;)

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ZPT: examples in The Zope Book don't work
by Joseph A. Knapka 28 Aug '02

28 Aug '02

Hi folks, I was trying page templates out for the first time the other day, and ran into this minor problem: After cut&pasting the code from the "compoundInterest" example in chapter 5 of TZB into my ZMI, they didn't work. The interestDisplay template, confronted with <span tal:replace="years">, threw an exception claiming that "years" was undefined. Changing it to <span tal:replace="request/years"> worked fine. Similarly, all references to request variables in the invocation of the Python script had to be changed from "variable" to "request.variable". Am I missing something here, or is this the way templates are supposed to work? (Incidentally, this was Zope 2.5.1 on a Linux box.) Thanks, -- Joe "I'd rather chew my leg off than maintain Java code, which sucks, 'cause I have a lot of Java code to maintain and the leg surgery is starting to get expensive." - Me

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test scripts with versions
by Jim Kutter 28 Aug '02

28 Aug '02

One question as an offshoot to my last question. Testing a script (Python) while in a version is unsupported because of "TemporaryStorage is incompatible with versions" Doh So how do I test scripts while in a version? -jim

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calling PythonScript on another machine
by alienoid 28 Aug '02

28 Aug '02

Hello zope users, Can anybody explain how I can call Python Script on comp B Zope from Python Script on comp A Zope? Thanks in advance -- Best regards, alienoid mailto:alienoid@is.lg.ua

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xron on Solaris
by Shilpa Shenvi 28 Aug '02

28 Aug '02

Hello, I am having some problems with xron. One machine runs Solaris 8 - the xron does not have problems here. However, I am having difficulty running xrons on the machine with Solaris 2.5.1. In both cases, I use Zope 2.5 and xron 0.0.10 . On the machine with Solaris 2.5.1, the first time I add a xron to a directory, it shows up in the Cataloged Objects field of the Scheduler. However, after the time it should have run, the Cataloged Objects field is completely cleared even though I had specified a reschedule. In addition, the method that I specify to run on the xron is never executed. Is there anything I can change to get the xron running on the Solaris 2.5.1 machine? Is there some incompatibility with the version of the operating system? Thanks, Shilpa

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Report into Solaris Zope Performance - The Postscript
by Paul Browning 28 Aug '02

28 Aug '02

This report <http://www.zope.org/Members/glpb/solaris> (March 2002) painted a rather depressing picture for "poor little rich kids" obliged to run Zope on Solaris. The following is offered by way an update. The residual crunch issue seems to be what happens when you put a database adapter in the mix. We're not yet sure whether the various tweaks we've applied cure Zope applications that make heavy use of back-end Oracle databases. <http://www.zope.org/Members/glpb/solaris/report_ps> Please continue to report your experiences to zope(a)zope.org and I'll try to provide an update from time to time. Paul -- The Library, Tyndall Avenue, Univ. of Bristol, Bristol, BS8 1TJ, UK E-mail: paul.browning(a)bristol.ac.uk URL: http://www.bris.ac.uk/

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RE: [Zope] No stack trace returned on XMLRPC call
by Jay, Dylan 28 Aug '02

28 Aug '02

> -----Original Message----- > From: Dieter Maurer [mailto:dieter@handshake.de] > Sent: Wednesday, 28 August 2002 6:48 AM > To: Jay, Dylan > Cc: 'zope(a)zope.org' > Subject: Re: [Zope] No stack trace returned on XMLRPC call > > > Jay, Dylan writes: > > I'm calling a PythonScript via xmlrpc and an error is > being returned that > > includes HTML with the error type and value but no stack > trace. I've no idea > > if this is correct behaviour or a bug or a > misconfiguration but it's really > > annoying me as I have no idea how to reproduce the error > inside zope where I > > do get stack traces. The zope instance is running on w2k > with -D option and > > I get stack traces in the HTML with normal webrequests > (assuming they cause > > an exception). > Call your PythonScript via HTTP (instead of XML-RPC). > This can look something like: > > > <http://<your-Zope>/<PathToTheScript>?param1=value1&param2=value2&... > > You may need urlencoding and form variables converters to get > the correct > values to the script. > > If this is two complex, make a specialized Python Script, that calls > your Python script with the correct arguments. > Call this Python Script via HTTP. If I could I would, but the arguments include lists of dictionaries which zope doesn't handle as normal http yet.

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Re: [Zope] Virtual Host Monster, Win 98, ZopeBook2.6
by Jaroslav Lukesh 28 Aug '02

28 Aug '02

| Odesílatel: Danny Morgan <danielhmorgan(a)cox.net> | I also added the line: | www.example.com:8080/vhm_test | to the VHM's 'Mappings' tab. | | When I enter 'www.example.com:8080' in my browser, I get an | 'Invalid syntax error/Page Cannot Be Displayed'. Try this mappings: www.example.com/vhm_test and add www.example.com to the file: c:\windows\hosts Regards JL.

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Frontpage-like editor for Zope/Linux?
by Robert Oschler 28 Aug '02

28 Aug '02

I'm looking for a (at least semi) WYSIWIG form painter slash HTML/DTML editor for Zope running on SuSE Linux web pages. Anybody seen such a beast? If so, what do you think of it? thx

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do I need to get user's password?
by Terry Hancock 28 Aug '02

28 Aug '02

Hi, I'm looking at implementing a very simple encrypted password scheme, using SimpleUserFolder. The documentation says I need to implement a function to return a user's password. But if I understand encryption at all, this is supposed to be impossible. What should I do? Return an empty string? The hashed password? What depends on this capability? Surely it doesn't need this to support logins, does it? Also, should I expect any trouble with using SUF with CookieCrumbler to get cookie-based authentication? Otherwise, SUF looks pretty straightforward. Just trying to make sure I understand what I'm doing. ;-D Thanks, Terry -- ------------------------------------------------------ Terry Hancock hancock(a)anansispaceworks.com Anansi Spaceworks http://www.anansispaceworks.com P.O. Box 60583 Pasadena, CA 91116-6583 ------------------------------------------------------

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