🌐 Mailman 3 October 2002 - Python-list - python.org

McMillian installer + win32com.client.constants - how to use them together?
by vtail＠yandex.ru Oct. 1, 2002

Oct. 1, 2002

Greetings, can anybody please explain me the Right Way to use McMillian installer with application that uses constants from MSWord library? I've generate them with win32com/client/makepy.py and use them in my code via ====> import win32com.client ... a = win32com.client.constants.wdBlack # application crashed here ... <=== When I build .exe from my applications it is crashed on marked line with AttributeError exception. I've tried to study this subject myself, but now I'm totally confused with all this gencache.EnsureModule(), prog_id, CLSID etc. I can't find any clear documentation on the subject. I'll greatly appreciated any help on this, even RTFM links ;). Victor.

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Find out link location
by Klaus Hoeppner Oct. 1, 2002

Oct. 1, 2002

Hi, with the os.path module I can use the islink function to check, wether a file is symbolic link. But how can I find out, where the link points to. E.g. if I have readme.txt --> ../packages/mypackage/readme.txt how do I get the "../packages/mypackage/readme.txt" with python? Regards Klaus

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help with writing extension
by Eric Hagemann Oct. 1, 2002

Oct. 1, 2002

I have been handcrafting an extension module creating a new type I am making use of the numeric methods (+,-,* etc) I solved the problem of the object interating with other types by working through the __coerce__() function and have no issue with operations like <obj>+2 but I am getting an error on 2-<obj>. In Beazley's book there are descriptions of functions like __radd__() when defining a new type in python, but I cannot find reference to these functions in C ? I have checked the doc's (not to say that I did not miss something ;) ) What is interesting is that both <obj>+2 and 2+<obj> both end up in the __coerce__ function. Whats even more interesting is that the arguments to __coerce__ are in the same order for both function calls, the first argument is <obj> the second is a PyInt. The Error I get (for 2+<obj>) is Traceback (most recent call last): File "C:\py_lib\test.py", line 30, in ? print "2+d = ",2+d TypeError: unsupported operand types for + that occurs after the __coerce__ function finishes. Has anybody worked through this before?

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Is there a docutils / reStructuredText system for C++ source code available?
by Pierre Rouleau Oct. 1, 2002

Oct. 1, 2002

I have been using docutil and reStructuredText for Python code and it works great. Pydoc does a superb job of helping in setting up an internal web site that provides documentation for our Python code, let alone the ability to run doctest test and show auto testing of python documentation on line! That works great for our Python code. Now i want to do the same thing for our C++ code. Since Python has been partly implemented in C / C++ i tough there might already exist some tools for parsing C++ and some comments (given some formatting conventions) and generate the same kind of output the html tool of docutil does. Does any one know any thing that resembles that? Thanks -- Pierre Rouleau

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Keeping track of variables.
by kingfool Sept. 30, 2002

Sept. 30, 2002

Is there an editor I can use that will help me find the first instance a variable was used across an entire program of multiple files? Reason I ask is because I'm going through and adding features to a program as a learning experience. Coming from C++ as my only programming language I find it a bit confusing to not know when something was declared/used first, which can reveal a bit more about what the variable is for.

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Re: a question about mailman
by Tim Roberts Sept. 30, 2002

Sept. 30, 2002

"Mark McEahern" <marklists(a)mceahern.com> wrote: > >Hmm, when I glanced at the code it looked like the order of processing in >the pipeline was for the message to pass through the Archiver before the >Dispatcher, so I just simplistically assumed: 1) that the Archiver added >enough information to the message so that; 2) by the time the message got to >the Dispatcher, you'd have enough information to format a pseudo string like >this in the footer: Mailman allows for external archivers. Most installations just use the built-in one, pipermail. However, even with that, unless you modify the code otherwise, Mailman spins off a separate thread to do the archiving. Thus, there is no guarantee that you know the actual URL by the time the message goes out. -- - Tim Roberts, timr(a)probo.com Providenza & Boekelheide, Inc.

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Re: redhat8
by William Sept. 30, 2002

Sept. 30, 2002

Anthony Tuininga <anthony(a)computronix.com> writes: > According to the release documentation: > > Python 2.2.1 is on the CD. great, but i would like to know if it's the default version, linked with /usr/bin/python... -- William Dodé - flibuste.net http://wikipython.tuxfamily.org

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ANN: empy 2.0 -- Embed Python in template text as markup
by Erik Max Francis Sept. 30, 2002

Sept. 30, 2002

Summary empy is a system for embedding Python expressions and statements in template text; it takes an empy source file, processes it, and produces output. This is accomplished via expansions, which are special signals to the empy system and are set off by a special prefix (by default the at sign, '@'). empy can expand arbitrary Python expressions and statements in this way, as well as a variety of special forms. Textual data not explicitly delimited in this way is sent unaffected to the output, allowing Python to be used in effect as a markup language. Also supported are "hook" callbacks, recording and playback via diversions, and dynamic, chainable filters. The system is highly configurable via command line options and embedded commands. Expressions are embedded in text with the '@(...)' notation; variations include conditional expressions with '@(...?...:...)' and the ability to handle thrown exceptions with '@(...$...)'. As a shortcut, simple variables and expressions can be abbreviated as '@variable', '@object.attribute', '@function(arguments)', '@sequence[index]', and combinations. Full-fledged statements are embedded with '@{...}'. Forms of conditional and repeated expansion are available via '@[...]'. A '@' followed by a whitespace character (including a newline) expands to nothing, allowing string concatenations and line continuations. Comments are indicated with '@#' and consume the rest of the line, up to and including the trailing newline. '@%' indicate "significators," which are special forms of variable assignment intended to specify per-file identification information in a format which is easy to parse externally. C-style escape sequences can be specified with '@\...', and finally a '@@' sequence expands to a single literal at sign. Getting the software The current version of empy is 2.0. The latest version of the software is available in a tarball here: "http://www.alcyone.com/pyos/empy/empy-latest.tar.gz", http://www.alcyone.com/pyos/empy/empy-latest.tar.gz. The official URL for this Web site is "http://www.alcyone.com/pyos/empy/", http://www.alcyone.com/pyos/empy/. Requirements empy should work with any version of Python from 1.5.x onward. License This code is released under the "GPL", http://www.gnu.org/copyleft/gpl.html. ... Release history [since 1.x] - 2.0; 2002 Sep 30. Parsing system completely revamped and simplified, eliminating a whole class of context-related bugs; builtin support for buffered filters; support for registering hooks; support for command line arguments; interactive mode with -i; significator value extended to be any valid Python expression. -- Erik Max Francis / max(a)alcyone.com / http://www.alcyone.com/max/ __ San Jose, CA, US / 37 20 N 121 53 W / ICQ16063900 / &tSftDotIotE / \ To be adult is to be alone. \__/ Jean Rostand Crank Dot Net / http://www.crank.net/ Cranks, crackpots, kooks, & loons on the Net.

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Re: Decimal arithmatic, was Re: Python GUI app to impress the boss?
by bokr＠oz.net Sept. 30, 2002

Sept. 30, 2002

On Sun, 29 Sep 2002 17:33:57 -0500, "Chris Gonnerman" <chris.gonnerman(a)newcenturycomputers.net> wrote: >----- Original Message ----- >From: "Bengt Richter" <bokr(a)oz.net> > > >> On 29 Sep 2002 17:06:53 GMT, Christopher Browne <cbbrowne(a)acm.org> wrote: >> >> >The problem with FP is that FP involves the use of binary >> >approximations, which commonly cannot exactly represent >> >decimal values. >> > >> >Notably, the decimal fraction 0.1, which is /exactly/ 1/10, >> >does not have any exact encoding in binary. Its >> >representation in binary is a repeating binary fraction. >> >> How is that a significantly different problem from repeating >> decimal fractions? (E.g., 1/3. or 1/7. or wxyz/9999. which >> will give you 0.wxyzwxzy..?) > >Humans think in decimal. To a human, 1.0/10.0 == 0.1, not >0.10000000000000001. OK, so this *rounds* to 0.10 at two >decimal places, but what about: > >>>> .70 * .05 >0.034999999999999996 > >Rounded to two decimals, that's 0.03; but done in proper >decimal numbers, the answer should be 0.035, rounded to 0.04 >using either "classic" or "banker's" decimal rounding. > >If you are calculating sales tax, for instance, this is >unacceptable. > >(I borrowed this example from memory from a previous poster, >and if I could remember who it was I'd give credit...) > >You ask how it is a different problem. Simple. A human, I hope that includes me ;-) >training in decimal math in grade school, knows that > > 1/3 = 0.3333333... > >and would *expect* it to round to 0.33 (still in two decimal >places). The problem with *binary* floating point is the >"surprise factor." > Old programmers aren't surprised by anything. They expect the unexpected ;-) >So, Bengt, how do I do this right using only floats? I can't. >I have to have decimal arithmetic to get the right answer. > It goes back to requirements. E.g., >>> for x in xrange(100): ... for y in xrange(100): ... fx = float('.%02d' %x) ... fy = float('.%02d' %y) ... fxy = fx*fy ... xy = x*y ... sfxy = '%.2f' % (fxy*1.000000001) ... sxy = '0.%02d' % ((xy+50)/100) ... assert sfxy == sxy ... finishes sans problem, as a quick check on a limited problem domain. Obviously a proper test suite and some math would be required to show validity for a realistic problem domain. If you can specify exactly how your decimal virtual machine works, (i.e., how many significant figures are carried, how it rounds/truncates intermediate values etc., and how many figures are going to be in the inputs and outputs, then we can determine how much of a problem it will be to do it using floating point. The example you cited is included in the above: >> '%.2f' % ( .05 * .70) 0.03' >> '%.2f' % (-.05 * .70) -0.03' changes to >> '%.2f' % (( .05 * .70) * 1.000000001) 0.04' >> '%.2f' % ((-.05 * .70) * 1.000000001) -0.04' There is not unlimited room in the double floating point space around the true abstract real values corresponding to decimal representations, but there is quite a bit, unless you are carrying a lot of figures. E.g., as an approximate indication, >>> '%.2f' % ((.0349999999 ) * 1.0000000001) '0.03' >>> '%.2f' % ((.03499999999 ) * 1.0000000001) '0.03' >>> '%.2f' % ((.034999999999 ) * 1.0000000001) '0.04' and the multiplier is probably bigger than it has to be (and better specified in binary). But that can be optimized when you specify your decimal virtual machine. If you need rounding that alternates direction on alternate exact trailing fives, then you need an extra step. If you visualize the true theoretical decimal values representable in your decimal virtual machine as little red glowing dots on the real axis, and visualize as little glowing blue dots all the exact theoretical numbers corresponding to all valid bit combinations in a floating point double, then if every pair of successive red dots has thousands of blue dots in between, and the error in floating point calculations can be held to within a few blue dots, then you can see how to select the red dot that represents the true decimal answer, even if there is no blue dot exactly coinciding with it. Twelve decimal digits would give about a thousand blue dots between the red ones. And a thousand times that while still in the FPU, before storing in memory. Rounding an exact decimal is moving from one red dot to another, perhaps skipping hundreds or thousands of dots, depending on fractional decimals carried. But we must round by moving from some blue dot to another blue dot. By shifting the blue uncertainty set reliably to one side of its true red dot, we can move from blue dot to blue dot where the new blue dot will reliably be in an uncertainty set corresponding to the proper red dot. If more blue dots are needed, they can be arranged. If you are doing very few operations, so that the range of blue dot uncertainty that can be accumulated is small, then you can have more red dots. Regards, Bengt Richter

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PROBLEM with form in cgi
by CheapSkate Sept. 30, 2002

Sept. 30, 2002

HI, I'm having problem trying to figure out what is wrong with my cgi script. here's the code that's creating the problem in the apple.cgi print """<form action="delete.html" name="myform" method="post">""" ^ it keeps on saying invalid syntax in the action(as indicated) and if I try to change it to this print """<form action="delete.html" name="myform" method="post">""" ^ it gives the error at action. Please help.

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