June 2004 - Zope - Zope lists

repozo import error
by Raphael Badin 23 Jun '04

23 Jun '04

Hi all, I might be a simple PYTHONPATH trick ... but I can't get the backup/restore tool repozo to work ... stacktrace ------ File "repozo.py", line 75, in ? from ZODB.FileStorage import FileStorage File "/usr/local/src/Zope/lib/python/ZODB/__init__.py", line 18, in ? import cPersistence, Persistence ImportError: No module named cPersistence Thx, Raphael

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modifying ZMI
by David Siedband 23 Jun '04

23 Jun '04

I'm interested in what would be involved in modifying the ZMI to create a button to 'duplicate and rename' instead of doing 'copy', 'paste', 'rename' when I want to clone a new version of an existing object. thx -- David Siedband Oceanic Sky New Media http://oceanicsky.com

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Product for user registration?
by Robb Shecter 23 Jun '04

23 Jun '04

Hi, Anybody recommend a product or system that for users to register themselves in a Zope site? Basically, I want to have the functionality of the Plone registration process, but I don't need the whole Plone system. I'm guessing that I'm going about this the right way; I want to do light-weight user-membership types of things - customized preferences, saved searches, opt-in mailing lists, etc. The Zope user model looks perfectly adequate to build on to make these - no reason to use Plone, and then have to dismantle and not use most of it. And so, I'm wondering if there's a stand-alone package for users to register and eventually cause an entry in a user folder to be created. Thanks, Robb

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easy question ? How to jump back to a previous page..
by Martin Koekenberg 22 Jun '04

22 Jun '04

hello, I've a loginscreen (Session based User folder). In my index_html template is the folowing code : <dtml-if expr="AUTHENTICATED_USER.getUserName() == 'Anonymous User'"> <dtml-call expr="RESPONSE.redirect('/login', lock=1)"> </dtml-if> /login is the login page. But how can I automaticaly jump back (after a succesfull login) to de page that was requested before the loginscreen ? Example: I enter the site (http://beta.swol1894.nl) That page will forward me to the login. After a succesfull login I want a jump to the homepage. (That page send me to the login). Who know's a solution for this ? Greetings, Martin Koekenberg

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CMFPlone
by Laura McCord 22 Jun '04

22 Jun '04

Hi, I am so desparate right now because I have been working with this issue all day. I need to add one more textfield in the edit form (image_edit_form). Then I need to display it along with the description when the photo is selected. This what I added in the edit form: <div class="field" tal:define="text request/text | here/Text"> <textarea cols="80" rows="5" tabindex="" id="text" name="text" tal:content="text" tal:attributes="value Text; tabindex tabindex/next;" > Text </textarea> </div> Then in photoalbum_photo_view I added this under the description: <div tal:content="structure image/Text">text</div> I am forgetting something because it is giving me an attribute error regarding 'Text' Any help to solve this would surely be appreciated. Thanks, Laura

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Solution for Problem with container in External Method
by hawelek_tlen 22 Jun '04

22 Jun '04

Ok, I found a solution, I can write it in External Method in this way: def onAddExtMethod(self): connection=self.restrictedTraverse('MySqlCon') connection.manage_open_connection() regards, Adam

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"Too many open files" - New Zope Installation
by Sean Hardman 22 Jun '04

22 Jun '04

I have a new installation of Zope on a Solaris machine with the following software versions: Solaris 2.9 Python 2.3.4 Zope 2.7.0 Plone 2.0.3 Error messages similar to the following crop up in a relatively short amount of time: 2004-06-21T15:59:03 ERROR(200) SiteError http://test:8080/cio/favicon.ico/inde x_html Traceback (most recent call last): File "/opt/Zope-2.7/lib/python/ZPublisher/Publish.py", line 100, in publish File "/opt/Zope-2.7/lib/python/ZPublisher/mapply.py", line 88, in mapply File "/opt/Zope-2.7/lib/python/ZPublisher/Publish.py", line 40, in call_object File "/opt/zope/Products/CMFCore/FSFile.py", line 91, in index_html File "/opt/zope/Products/CMFCore/FSObject.py", line 115, in _updateFromFS File "/opt/zope/Products/CMFCore/FSFile.py", line 69, in _readFile IOError: [Errno 24] Too many open files: '/opt/zope/Products/CMFPlone/skins/plon e_images/favicon.ico' I have increased the max descriptors to 1024 which only delays the problem by a couple of minutes. Oddly enough the problem clears itself after three hours of minimal use otherwise I have to restart to clear it. Any suggestions, obvious or otherwise, would be greatly appreciated. Sean --

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Problem with container in External Method
by hawelek_tlen 22 Jun '04

22 Jun '04

Hi, I have Problem with External Method, I try to execute the same code like in Python script: connection=container.restrictedTraverse('MySqlCon') connection.manage_open_connection() in External Method: def onAddExtMethod(): connection=container.restrictedTraverse('MySqlCon') connection.manage_open_connection() and I get always the same error: Error Type: NameError Error Value: global name 'container' is not defined so my question, how can I refere to "conteiner" or "context" in External Method? thanks for help, best regards, Adam

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THE UNCERTAINTY PRINCIPLE IS UNTENABLE
by Boll 22 Jun '04

22 Jun '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. 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: 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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Current location: is my script reliable?
by Tonico Strasser 22 Jun '04

22 Jun '04

Use case I want to add fragement identifier like #xyz to a link and don't want to reload the page and preserve the query strings when I click on it. Example address: <https://www.example.com/foo/bar?x=y> Why it doesn't work by default By default, if I click on an anchor with '#xyz' a regular UA computes https://www.example.com/foo/#xyz because Zope adds a <base> tag to generated pages. This little python script might help to get the "real" location, but I'm not sure if it will work in all different setups and Zope versions: request = context.REQUEST server_url = request.get('SERVER_URL') path_info = request.environ.get('PATH_INFO') path_info = path_info.split('VirtualHostRoot')[-1] query_string = request.get('QUERY_STRING') if query_string: query_string = '?%s' % query_string location = server_url + path_info + query_string return location My questions Is 'PATH_INFO' always available? Is there something else I should consider? Thanks. Tonico

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