Re: Gadfly server startup error
Steve Holden wrote: > Yes, the whole Gadfly SF web seems to be a bit of a mess. Maybe it has been infected by the source code+doc ;-) I just started the server (after applying Carl's changes) with gfserver foodb . '' (the DB "foodb" had been created earlier using gfplus locally). If I look for it with "nmap localhost -p ", it enters an endless loop (I don't know whether it would still work after this, since I could not get it to work at all). gfplus in client-mode wants the argument order DB, port-No, password, host (inferred from the source, i.e. the manual is wrong). The argument order of commandlines and functions seems to be a general problem - maybe I should try all 24 possibilities (almost each place in the source does them differently). After that, it says |gfplus $Revision: 1.7 $ -- Interactive gadfly shell [readline] | |Wednesday September 13, 2006 04:53 PM |Using: |Policy: foodb |Loc: localhost: i.e. it includes a thing called "Policy" (unexplained, just mentioned in the "Security" chapter of the server manual) and fills it with the value of the database name (but comparing scripts/gfplus.py and client.py, "database" and "policy" seem to be synonyms (but this disagrees with server.py)). Entering a lone semicolon+return at the client prompt causes a timeout in the client and a message |no such policy: foodb |main loop on |server: waiting for connection(s) in the server (which is true in some sense, since I never made a policy - I just want a blood DB). It seems the proper way to use gadfly over the net is to say echo 'SQL statement;' | ssh -l remoteuser 'gfplus -localoptions' :-( Is anybody out there who has used the server+client operation mode successfully? Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Gadfly server startup error
Steve Holden wrote: > You're already doing better than I am. On Cygwin 2.5rc2 and Windows > 2.4.2 I can't even get it to runs its tests properly: I don't remember whether I looked into that at all. ... > NameError: global name 'Server' is not defined ... > Time to report a bug, methinks? Makes SQLite look good ... Carl Waldbieser reported this bug (and a few others, including fixes) in April 04 (entry 94049[35]). It seems the project fell asleep four years ago (but in "News" on SF is a more recent message from the author pointing to xsdb). Ralf -- http://mail.python.org/mailman/listinfo/python-list
Gadfly server startup error
Hello, I just tried the recent gadfly (from SF), using Python 2.4.2 (hand built, since my Suse 8.2 had only 2.2.2). The direct operation of gadfly works. After calling gfserver, I get (in addition to a complete users manual dumped on the screen) the following error message: |Traceback (most recent call last): | File "/usr/local/bin/gfserver", line 4, in ? |main() | File "/usr/local/python-2.4.2/lib/python2.4/site-packages/gadfly/scripts/gfserver.py", line 89, in main |S = Server(int(port), db, dr, pw, startup) |NameError: global name 'Server' is not defined which is factually correct (the script only imports sys, but then tries to instantiate the class "Server" which is nowhere defined). Is this a bug somewhere, or is just my installation broken? Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: time.clock() going backwards??
Grant Edwards wrote: > This is a _Microsoft_Product_. There doesn't have to be a > reason for something to be done in a half-assed manner. No, it is a quantum effect. If the energy of a clock has a lower bound, there must be a nonzero probability for it to run backwards. See <[EMAIL PROTECTED]> SCNR, Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Railroad track syntax diagrams
Paddy wrote: > I googlled and got these: > http://www.informatik.uni-freiburg.de/~thiemann/haskell/ebnf2ps/ > http://www.antlr.org/share/1107033888258/SDG2-1.5.zip There is another beast, also called ebnf2ps, but in elisp (runs inside the editor). It requires no additional software (i.e. no ghc) and is simpler to use (no questions about inexistent .afm files etc.) Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: 10GB XML Blows out Memory, Suggestions?
Paul McGuire schrieb: > meat of the data can be relatively small. Note also that this XML overhead > is directly related to the verbosity of the XML designer's choice of tag > names, and whether the designer was predisposed to using XML elements over > attributes. Imagine a record structure for a 3D coordinate point (described > here in no particular coding language): > struct ThreeDimPoint: > xValue : integer, > yValue : integer, > zValue : integer > Directly translated to XML gives: > > 4 > 5 > 6 > This is essentially true, but should not cause the OP's problem. After parsing, the overhead of XML is gone, and long tag names are nothing but pointers to a string which happens to be long (unless *all* tags in the XML are differently named, which would cause a huge DTD/XSD as well). > This expands 3 integers to a whopping 101 characters. Throw in namespaces > for good measure, and you inflate the data even more. In the DOM, it contracts to 3 integers and a few pointers - essentially the same as needed in a reasonably written data structure. > Try zipping your 10Gb file, and see what kind of compression you get - I'll > bet it's close to 30:1. If so, convert the data to a real data storage In this case, his DOM (or whatever equivalent data structure, i.e. that what he *must* process) would be 300 MB + pointers. I'd even go as far and say that the best thing that can happen to him is a huge overhead - this would mean he has a little data in a rather spongy file (which collapses on parsing). > medium. Even a SQLite database table should do better, and you can ship it > around just like a file (just can't open it up like a text file). A table helps only if the data is tabular (i.e. a single relation), i.e. probably never (otherwise the sending side would have shipped something like CSV). Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Name conflict in class hierarchy
bruno at modulix wrote: >> In Python, a function not intended to be overriden should be either >> have a name starting with an underscore > actually with *two* underscores. The single-leading-underscore naming > scheme is the convention for 'protected' (read: 'implementation, not > API') attributes. That's what I meant. "A.func" looked like an internal implementation detail. >> or be documented. Having the implementation details documented too would be nice, but hardly enforceable in real life. Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Name conflict in class hierarchy
Jeffrey Barish wrote:
[overriding of base class member functions by subclass]
> but then B does not inherit other functions of A that I would like to use.
> It struck me that this must be a common problem in OOP, so I'm wondering
> whether there is a simple solution that I am missing.
In C++, one has virtual member functions (which behave like python's),
and their purpose is to be overriden (o.g. a print method, whose subclass
version will print more attributes than the base knows about).
Such functions usually are documented - otherwise their being virtual
would make no sense.
In Python, a function not intended to be overriden should be either
have a name starting with an underscore or be documented. So the person
who should change something is the author of the library, not you.
In your current situation, the following options seem to remain:
1. Use funny names ("foobar239847562384756" instead of "func")
and hope that the library update will not use them
2. Call dir(classname) at hacking time and avoid names listed
therein. This breaks if the library update may happen at the
user's site without you being able to change your code.
3. Call dir(classname) at runtime and raise an exception
if it contains a name used by you.
Ralf
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Re: [silly] Does the python mascot have a name ?
John D Salt wrote:
> I'll believe you if you can give me a list of ten things that don't have
> names.
[ sub{$_}, sub{$_+1}, sub{$_+2}, sub{$_+3}, sub{$_+4},
sub{$_+5}, sub{$_+6}, sub{$_+7}, sub{$_+8}, sub{$_+9}]
That was easy.
Ralf
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Re: [OT] Any Python lullabies?
Christos Georgiou wrote: > Since there have been python limmericks, are there any Python lullabies that > I can sing to my newborn son (actually, born yesterday)? I tried to murmur > some select parts from the tutorial, but he somehow wasn't very interested > :) There is something near the end of the Camel book (p. 552ff). This isn't exactly python, but the baby probably won't see the difference. SCNR, Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: "The World's Most Maintainable Programming Language"
Mirco Wahab wrote: > Perl, named after Pearl Biggar (Larry Wall’s fiancée), His wife was Gloria since at least 1979, perl was published in 1987. This seems to be an insider joke (he wanted to call the language "Gloria" first, then "pearl", then "perl"). > set a high standard for naming techniques. So we should rename Python into Cottonmouth to get more attention. Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Any advantage in LISPs having simpler grammars than Python?
Douglas Alan wrote:
> Experienced Lisp programmers use indentation to visually parse the
> program structure, just like Python programmers do for Python.
> Experienced Lisp programmers learn to not see the parentheses when
> they don't need to.
True, and this is IMHO an advantage of lisp to python (both humans
and computers get something they are good at parsing, and mistakes
in the one can be corrected using the other).
> When I did a lot of Lisp programming, I often felt that it would be
> kind of nice to have a version of Lisp that would infer many of the
> parentheses from indentation, so that you could elide most of them.
This is not necessary - just making them barely visible suffices.
(font-lock-add-keywords
'emacs-lisp-mode
'(("[()]" . somr-barely-visible-face)))
One can also use nil instead of the mode, wrap the thing into a
defun and use it as a hook (nil means "just the current buffer
whatever mode it is in").
Btw., vim seems to try to become a real editor - look at
http://wiki.alu.org/Vim_ECL
Ralf
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Re: processing the genetic code with python?
James Stroud wrote:
> I'm writing your name down and this is the last time I'm doing homework
> for you.
This won't help - she doesn't even know her name
(but google helps with that) ;-)
The fact that she uses E.coli ribosomal protein L1
strongly indicates that this is really homework.
...
> data = data.upper().replace('T', 'U')
...
I'd apply the "inverse" of this line to the codon table
(or a copy thereof, or just adding the entries) in the hope
that changing 37 table entries is less work than changing
each codon in a base sequence.
Ralf
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Re: Determing whether two ranges overlap
Robin Haswell wrote: > I can think of lots of ways to do this but it's in a tight loop so I need > it to be as efficient as possible. Any help welcome :-) There are 24 possibilities of having 4 numbers in a row, and the following 6 of them describe nonempty intervals (the remaining 18 are obtained by reversing the endpoints of one or both intervals, thereby making them empty): # separate a0 a1 b0 b1 b0 b1 a0 a1 # inside a0 b0 b1 a1 b0 a0 a1 b1 # cross a0 b0 a1 b1 b0 a0 b1 a1 The simplest is to exclude the first pair, i.e. not (a1=b0 and b1>=a0, given by Fredrik without proof ;-) You will have to decide whether you want ">" or ">=" (beware of the former when using floats). If you cannot assume that the pairs are in order, this will break. Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Shortest prime number program
Christoph Zwerschke wrote: > [EMAIL PROTECTED] schrieb: >> How about: >> [2]+[x for x in range(1,99) if 2**x%x==2] > If the range goes beyond 340, it also gives non-primes... [2,3]+[x for x in range(1,99) if 2**x%x==2 and 3**x%x==3] [2,3,5]+[x for x in range(1,99) if 2**x%x==2 and 3**x%x==3 and 5**x%x==5] SCNR, Ralf PS: They both break at 561, and further strengthening of the condition will not help. Manual loop unrolling as follows works: [2,3,... ]+[x for x in range(1,99) if False] For sufficiently small values of 99, this will also be a rather short program. -- http://mail.python.org/mailman/listinfo/python-list
Re: Encoding sniffer?
Diez B. Roggisch wrote: > AFAIK iso-8859-1 has all codepoints taken - so you won't go beyond that > in your example. IIRC the range 128-159 (i.e. control codes with the high bit set) are unused. Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: popen4
Ganesan Rajagopal wrote: > Try pexpect instead. http://pexpect.sourceforce.net/ ^ That's a content-free ad site. You probably mean sourceforGe. Ralf -- http://mail.python.org/mailman/listinfo/python-list
Re: Lots of pdf files
Greg Lindstrom wrote: > Hello- > I'm running Python 2.3 on a Linux system and have lots (about 2000) > files in pdf format to print each day. If I just wind up and fire all > the files at the printer at once (as 2000 separate print jobs), the > print server throws a fit and our system admin comes down and slaps me > around for a few minutes (which, I guess, is fair). Are your sure it is the number (and not the sum of the sizes) of the jobs your admin is worrying about? What about #!/bin/sh for i in *.pdf; do lpr $i sleep 10 done (maybe adding something that waits until the queue is empty instead of sleep)? Ralf -- http://mail.python.org/mailman/listinfo/python-list
