February 2004 - Zope

ZODB on the file system
by Petter Holmström 24 Feb '04

24 Feb '04

Hello, I'm sure this question has been asked before in one form or another, but I have not found a reply that completely answers my question. So here we go again. We're trying to convince our computer department to use zope, however the fact that Zope stores all the files in a single datafile which isn't accessable through ordinary file management functions (and therefore eliminates incremental backups) make them hesitated. Is there any way to run Zope completely on the file system (also when running ZEO)? I've tried LocalFS but it doesn't seem to work with Plone and Zope 2.7 (and in addition it seems to be a bit insecure). How about ZFS? APE? Thanks, -Petter-

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Report to Sender
by coppergate1＠lentaspace.co.uk 24 Feb '04

24 Feb '04

Incident Information:- Database: d:/notes/data/mail.box Originator: zope(a)zope.org Recipients: BRK@lenta business space Subject: hi Date/Time: 02/24/2004 09:22:23 AM The file attachment doc.zip you sent to the recipients listed above was infected with the W32/Netsky.b@MM!zip virus and was not successfully cleaned. ======================================================================================== This message and any attachments are confidential and may also be privileged or otherwise protected. If you are not the intended recipient, you may not copy, distribute or disclose its content to any person or entity, use it for any purpose or store or copy the information in any medium. If you have received it in error, please notify the sender immediately and delete the message from your systems. Personal messages and/or opinions in a message are solely those of the author. The company will accept no responsibility for such messages. You are advised to check the message for computer viruses using your own software before opening any attachments.

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Re: <censored>
by colin.reed＠sovereignsc.co.uk 24 Feb '04

24 Feb '04

Please see the attached file for details ********************************************************* Disclaimer This message (including any attachments) contains confidential information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. ********************************************************* Visit us at http://www.mahindrabt.com

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the uncertainty principle is untenable
by Angel 24 Feb '04

24 Feb '04

Please reply to hdgbyi(a)public.guangzhou.gd.cn . Thank you ! THE UNCERTAINTY PRINCIPLE IS UNTENABLE By re-analysing Heisenberg's Gamma-Ray Microscope experiment and the ideal experiment from which the uncertainty principle is derived, it is actually found that the uncertainty principle can not be obtained from them. It is therefore found to be untenable. Key words: uncertainty principle; Heisenberg's Gamma-Ray Microscope Experiment; ideal experiment Ideal Experiment 1 Heisenberg's Gamma-Ray Microscope Experiment A free electron sits directly beneath the center of the microscope's lens (please see AIP page http://www.aip.org/history/heisenberg/p08b.htm or diagram below) . The circular lens forms a cone of angle 2A from the electron. The electron is then illuminated from the left by gamma rays--high energy light which has the shortest wavelength. These yield the highest resolution, for according to a principle of wave optics, the microscope can resolve (that is, "see" or distinguish) objects to a size of dx, which is related to and to the wavelength L of the gamma ray, by the expression: dx = L/(2sinA) (1) However, in quantum mechanics, where a light wave can act like a particle, a gamma ray striking an electron gives it a kick. At the moment the light is diffracted by the electron into the microscope lens, the electron is thrust to the right. To be observed by the microscope, the gamma ray must be scattered into any angle within the cone of angle 2A. In quantum mechanics, the gamma ray carries momentum as if it were a particle. The total momentum p is related to the wavelength by the formula, p = h / L, where h is Planck's constant. (2) In the extreme case of diffraction of the gamma ray to the right edge of the lens, the total momentum would be the sum of the electron's momentum P'x in the x direction and the gamma ray's momentum in the x direction: P' x + (h sinA) / L', where L' is the wavelength of the deflected gamma ray. In the other extreme, the observed gamma ray recoils backward, just hitting the left edge of the lens. In this case, the total momentum in the x direction is: P''x - (h sinA) / L''. The final x momentum in each case must equal the initial x momentum, since momentum is conserved. Therefore, the final x momenta are equal to each other: P'x + (h sinA) / L' = P''x - (h sinA) / L'' (3) If A is small, then the wavelengths are approximately the same, L' ~ L" ~ L. So we have P''x - P'x = dPx ~ 2h sinA / L (4) Since dx = L/(2 sinA), we obtain a reciprocal relationship between the minimum uncertainty in the measured position, dx, of the electron along the x axis and the uncertainty in its momentum, dPx, in the x direction: dPx ~ h / dx or dPx dx ~ h. (5) For more than minimum uncertainty, the "greater than" sign may added. Except for the factor of 4pi and an equal sign, this is Heisenberg's uncertainty relation for the simultaneous measurement of the position and momentum of an object. Re-analysis To be seen by the microscope, the gamma ray must be scattered into any angle within the cone of angle 2A. The microscope can resolve (that is, "see" or distinguish) objects to a size of dx, which is related to and to the wavelength L of the gamma ray, by the expression: dx = L/(2sinA) (1) This is the resolving limit of the microscope and it is the uncertain quantity of the object's position. The microscope can not see the object whose size is smaller than its resolving limit, dx. Therefore, to be seen by the microscope, the size of the electron must be larger than or equal to the resolving limit. But if the size of the electron is larger than or equal to the resolving limit dx, the electron will not be in the range dx. Therefore, dx can not be deemed to be the uncertain quantity of the electron's position which can be seen by the microscope, but deemed to be the uncertain quantity of the electron's position which can not be seen by the microscope. To repeat, dx is uncertainty in the electron's position which can not be seen by the microscope. To be seen by the microscope, the gamma ray must be scattered into any angle within the cone of angle 2A, so we can measure the momentum of the electron. dPx is the uncertainty in the electron's momentum which can be seen by microscope. What relates to dx is the electron where the size is smaller than the resolving limit. When the electron is in the range dx, it can not be seen by the microscope, so its position is uncertain. What relates to dPx is the electron where the size is larger than or equal to the resolving limit .The electron is not in the range dx, so it can be seen by the microscope and its position is certain. Therefore, the electron which relates to dx and dPx respectively is not the same. What we can see is the electron where the size is larger than or equal to the resolving limit dx and has a certain position, dx = 0. Quantum mechanics does not rely on the size of the object, but on Heisenberg's Gamma-Ray Microscope experiment. The use of the microscope must relate to the size of the object. The size of the object which can be seen by the microscope must be larger than or equal to the resolving limit dx of the microscope, thus the uncertain quantity of the electron's position does not exist. The gamma ray which is diffracted by the electron can be scattered into any angle within the cone of angle 2A, where we can measure the momentum of the electron. What we can see is the electron which has a certain position, dx = 0, so that in no other position can we measure the momentum of the electron. In Quantum mechanics, the momentum of the electron can be measured accurately when we measure the momentum of the electron only, therefore, we have gained dPx = 0. And, dPx dx =0. (6) Every physical principle is based on an Ideal Experiment, not based on MATHEMATICS, including heisenberg uncertainty principle. For example, the Law of Conservation of Momentum is based on the collision of two stretch ball in the vacuum; the Principle of equivalence(general relativity) is besed on the Einstein's laboratory in the lift. Please see the book: Max Jammer. (1974) The philosophy of quantum mechanics (John wiley & sons , Inc New York ) Page 96 Heisenberg's Gamma-Ray Microscope experiment is an ideal experiment. Einstein said, One Experiment is enough to negate a physical principle. Heisenberg's Gamma-Ray Microscope experiment has negated the uncertainty principle. Ideal experiment 2 Single Slit Diffraction Experiment Suppose a particle moves in the Y direction originally and then passes a slit with width dx(Please see diagram below) . The uncertain quantity of the particle's position in the X direction is dx, and interference occurs at the back slit . According to Wave Optics , the angle where No.1 min of interference pattern is can be calculated by following formula: sinA=L/2dx (1) and L=h/p where h is Planck's constant. (2) So the uncertainty principle can be obtained dPx dx ~ h (5) Re-analysis According to Newton first law , if an external force in the X direction does not affect the particle, it will move in a uniform straight line, ( Motion State or Static State) , and the motion in the Y direction is unchanged .Therefore , we can learn its position in the slit from its starting point. The particle can have a certain position in the slit and the uncertain quantity of the position is dx =0. According to Newton first law , if the external force at the X direction does not affect particle, and the original motion in the Y direction is not changed , the momentum of the particle int the X direction will be Px=0 and the uncertain quantity of the momentum will be dPx =0. This gives: dPx dx =0. (6) No experiment negates NEWTON FIRST LAW. Whether in quantum mechanics or classical mechanics, it applies to the microcosmic world and is of the form of the Energy-Momentum conservation laws. If an external force does not affect the particle and it does not remain static or in uniform motion, it has disobeyed the Energy-Momentum conservation laws. Under the above ideal experiment , it is considered that the width of the slit is the uncertain quantity of the particle's position. But there is certainly no reason for us to consider that the particle in the above experiment has an uncertain position, and no reason for us to consider that the slit's width is the uncertain quantity of the particle. Therefore, the uncertainty principle, dPx dx ~ h (5) which is derived from the above experiment is unreasonable. Conclusion >From the above re-analysis , it is realized that the ideal experiment demonstration for the uncertainty principle is untenable. Therefore, the uncertainty principle is untenable. Reference: 1. Max Jammer. (1974) The philosophy of quantum mechanics (John wiley & sons , Inc New York ) Page 65 2. Ibid, Page 67 3. http://www.aip.org/history/heisenberg/p08b.htm Author : BingXin Gong Postal address : P.O.Box A111 YongFa XiaoQu XinHua HuaDu GuangZhou 510800 P.R.China E-mail: hdgbyi(a)public.guangzhou.gd.cn Tel: 86---20---86856616

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java applet in zope
by Gregor de Lijzer 24 Feb '04

24 Feb '04

where can i get an example of how to integrate a java applet in Zope? Thanx Greg ______________________________________________________________________________ Ein Grund zum Feiern: Die PC Praxis ermittelt zwischen 10 grossen Mailprovidern WEB.DE FreeMail als Testsieger http://f.web.de/?mc=021190

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Python, Pre-Fill Form Fields
by AdvertisingDept 23 Feb '04

23 Feb '04

It IS a plain dictionary, and not a magic zope object. myrequest.form['key'] = 'value' does work correctly. Thank You Paul!!! Umm, while I have your attention, Can I ask you some conceptual questions about REQUEST in a new thread?

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Python, Pre-Fill Form Fields
by AdvertisingDept 23 Feb '04

23 Feb '04

thanks Paul, you're very patient. Unfortunately, I still can't set the FORM section of the REQUEST. I keep getting the error: 'dict' object has no attribute 'set' for either of the following scripts. Any ideas where I am going wrong? Python Script ------------------------------- #Get the HTML request object myrequest = container.REQUEST #preset the request field myrequest.form.set('aformfield', 'a value') #go to the form return context.theform(REQUEST=myrequest) Python Script ------------------------------- #preset the request field container.REQUEST.form.set('aformfield', 'a value') #go to the form return context.theform(REQUEST=container.REQUEST)

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Python, Pre-Fill Form Fields
by AdvertisingDept 23 Feb '04

23 Feb '04

thanks Paul, but... How does my browser's back button fill in the form values? Is there really no way to set a value into the FORM section of the REQUEST? For each input tag, setting up a tal lookup and fill-in, A. seems like a lot of work B. violates the ZPT concept of separating logic from layout. I would prefer keep all the logic in the python script.

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context.MailHost
by Simon Forster 23 Feb '04

23 Feb '04

I'm struggling with MailHost (Acquisition?). I've got a form which, through a PythonScript, sends me an email. This works fine. (context.MailHost.simple_send(...), is the call to send the email FWIW). When I move the MailHost up one directory, the self same script fails with something akin to: "Cannot locate object at: http://127.0.0.1:8080/xxx/yyy" I thought that, by Acquisition, Zope would look in the current folder, then the parent, then the parent's parent etc until it found the required object (or not). Obviously I don't understand this process. Can anyone help as I've spent some time trying to understand where I'm going wrong. TIA Simon Forster _____________________________________________________ LDML Ltd, 62 Pall Mall, London, SW1Y 5HZ, UK Tel: +44 (0)70 9230 5244 Fax: +44 (0)70 9230 5247 _____________________________________________________

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Python, Pre-Fill Form Fields
by AdvertisingDept 23 Feb '04

23 Feb '04

How do I... use a python script to pre-fill the value of a form's field? I am setting a field in the request, but it appears in the 'other' section of the request. Page Template - html form ------------------------------- <html> <body> <form method="POST" action=""> Enter text: <input name="aformfield" type="text" value="" /> <input type="submit" name="form.button.submit" value="Submit" /> </form> <br /><br /><br /> <p tal:content="structure request">stuff</p> </body> </html> Python Script ------------------------------- #Get the HTML request object myrequest = container.REQUEST #preset the request field myrequest.set('aformfield', 'a value') #go to the form return context.theform(REQUEST=myrequest) Note: I am actually trying to pre-fill a CMFformcontroller template in plone 2.0. However, if I can't get this most simple example to work... Many thanks in advance.

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