Re: Printing from Web Page
I think the best way to do this is using css with specific media type.Take a look at : http://martybugs.net/articles/print.cgi -- FELD BorisSent with Sparrow On dimanche 21 novembre 2010 at 03:35, Hidura wrote: Explain better what you try to do.2010/11/20, Victor Subervi : Hi; I need to be able to print something from a Web page: not the entire page but what I specify. I am writing the page and the client is surfing to it. How do I do this? TIA, beno-- Enviado desde mi dispositivo móvilDiego I. Hidalgo D.-- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to use Google's advanced search options?
Hello!
Thanks so much for the patched Pygoogle!
Also, please, can you give me some more information about how to use
google search api?
I am a newbie in Python, and I still try to cope with it. Thanks to some
experience in other
programing languages, I think I progress well, but I am not a
professional user/programer;
quite far from that.
Best,
Petar
On 20/11/10 21:27, Stefan Sonnenberg-Carstens wrote:
Am 20.11.2010 20:24, schrieb Petar Milin:
Thanks so much! However, 'options lang:de' does not exactly the same
as would 'lr=lang_de'? Am I right?
You're right.
Since I need number of hits, I would like to have the best, most
correct values! :-)
Sincerely,
PM
On Sat, Nov 20, 2010 at 12:00 PM,
wrote:
I took a look into pygoogle source code.
It does not send the 'lr' parameter to google.de (as it does not with
many more ...).
I patched it to enable the following (what you needed):
>>> from pygoogle import pygoogle
>>> g = pygoogle('linux site:.edu')
>>> g.lr = 'lang_de'
>>> g.pages = 2
>>> print 'German',g.get_result_count()
German 3910
>>> g.lr = 'lang_en'
>>> print 'English',g.get_result_count()
English 114
>>> g.lr = 'lang_cn'
>>> print 'Chinese',g.get_result_count()
Chinese 121
>>>
I have attached my patched version of pygoogle.
BTW: the google search api is very straight forware.
Perhaps it is easier to create a custom bot to do your queries.
Cheers,
--
http://mail.python.org/mailman/listinfo/python-list
Re: Does Pygoogle allows for advanced search options?
On 20/11/10 22:34, Chris Rebert wrote: On Thu, Nov 18, 2010 at 3:26 AM, neocortex wrote: The library doesn't seem to have built-in support for filtering by language (and Google lacks a search query-string-based operator for that), but it looks like you could implement that feature by adding an "lr" parameter with an appropriate value to the query `args` dictionary. See the "lr?" entry under "Web Search Specific Arguments" onhttp://code.google.com/apis/websearch/docs/reference.html, and lines 68& 102 of pygoogle.py. From those lines, it can be concluded that lr=lang_?? is not supported, unfortunately. Right; that's why I said "you could implement that feature". Pretty easily it would seem. Thanks for believing in me ( ;-) ), but I am a newbie in Python world, although with some experience in other prog. languages. So, if I read pygoogle.py well, I sould add lr parameter in init and then after lines 68 and 102? Thanks again! You guys here are very kind and helpful! Best, Petar -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Pygoogle allows for advanced search options?
Am 21.11.2010 11:01, schrieb Petar Milin:
On 20/11/10 22:34, Chris Rebert wrote:
On Thu, Nov 18, 2010 at 3:26 AM, neocortex wrote:
The library doesn't seem to have built-in support for filtering by
language (and Google lacks a search query-string-based operator for
that), but it looks like you could implement that feature by adding an
"lr" parameter with an appropriate value to the query `args`
dictionary. See the "lr?" entry under "Web Search Specific Arguments"
onhttp://code.google.com/apis/websearch/docs/reference.html, and
lines 68& 102 of pygoogle.py.
From those lines, it can be concluded that lr=lang_?? is not
supported, unfortunately.
Right; that's why I said "you could implement that feature". Pretty
easily it would seem.
Thanks for believing in me ( ;-) ), but I am a newbie in Python world,
although with some experience in other prog. languages.
So, if I read pygoogle.py well, I sould add lr parameter in init and
then after lines 68 and 102?
Correct.
I just did not read source code enough to realize the parameter is needed
twice. You just could hack that out, too :-)
Normally (what is normal, anyway ?) it's good practice to create an
contructor (__init__) in python which has the most common options
as keyword arguments and default values assigned, like so:
class Foo:
def __init__(self,lr='lang_en',url='http://some.of.this'):
self.lr = lr
self.url = url
...
Thanks again! You guys here are very kind and helpful!
Best,
Petar
#!/usr/bin/python
"""
Google AJAX Search Module
http://code.google.com/apis/ajaxsearch/documentation/reference.html
"""
try:
import simplejson as json
except:
import json
import urllib
__author__ = "Kiran Bandla"
__version__ = "0.1"
URL = 'http://ajax.googleapis.com/ajax/services/search/web?'
#Web Search Specific Arguments
#http://code.google.com/apis/ajaxsearch/documentation/reference.html#_fonje_web
#SAFE,FILTER
"""
SAFE
This optional argument supplies the search safety level which may be one of:
* safe=active - enables the highest level of safe search filtering
* safe=moderate - enables moderate safe search filtering (default)
* safe=off - disables safe search filtering
"""
SAFE_ACTIVE = "active"
SAFE_MODERATE = "moderate"
SAFE_OFF= "off"
"""
FILTER
This optional argument controls turning on or off the duplicate content filter:
* filter=0 - Turns off the duplicate content filter
* filter=1 - Turns on the duplicate content filter (default)
"""
FILTER_OFF = 0
FILTER_ON = 1
#Standard URL Arguments
#http://code.google.com/apis/ajaxsearch/documentation/reference.html#_fonje_args
"""
RSZ
This optional argument supplies the number of results that the application
would like to recieve.
A value of small indicates a small result set size or 4 results.
A value of large indicates a large result set or 8 results. If this argument is
not supplied, a value of small is assumed.
"""
RSZ_SMALL = "small"
RSZ_LARGE = "large"
class pygoogle:
def __init__(self,query,pages=10):
self.pages = pages #Number of pages. default 10
self.query = query
self.filter = FILTER_ON #Controls turning on or off the duplicate
content filter. On = 1.
self.rsz = RSZ_LARGE#Results per page. small = 4 /large = 8
self.safe = SAFE_OFF#SafeBrowsing - active/moderate/off
self.lr = 'lang_en' # Default searches to english
def __search__(self,print_results = False):
results = []
for page in range(0,self.pages):
rsz = 8
if self.rsz == RSZ_SMALL:
rsz = 4
args = {'q' : self.query,
'v' : '1.0',
'start' : page*rsz,
'rsz': self.rsz,
'safe' : self.safe,
'filter' : self.filter,
'lr': self.lr
}
q = urllib.urlencode(args)
search_results = urllib.urlopen(URL+q)
data = json.loads(search_results.read())
if print_results:
if data['responseStatus'] == 200:
for result in data['responseData']['results']:
if result:
print
'[%s]'%(urllib.unquote(result['titleNoFormatting']))
print
result['content'].strip("...").replace("",'').replace("",'').replace("'","'").strip()
print urllib.unquote(result['unescapedUrl'])+'\n'
results.append(data)
return results
def search(self):
"""Returns a dict of Title/URLs"""
results = {}
for data in self.__search__():
for result in data['responseData']['results']:
if result:
title = urllib.unquote(result['titleNoFormatting'])
results[title] = urllib.unquote(result['unescapedUrl
Download the free and exclusive involvement of Bandon the world's first Internet Security Nod32 Antivirus 4.2.67.10 version of Business Edition Topics Encyclopedia Internet Security / Antivirus****
Download the free and exclusive involvement of Bandon the world's first Internet Security Nod32 Antivirus 4.2.67.10 version of Business Edition Topics Encyclopedia Internet Security / Antivirus Download from here http://prosoftantivirus.blogspot.com/2010/11/nod32-antivirus-426710-business-edition.html -- http://mail.python.org/mailman/listinfo/python-list
Re: building a web interface
On Sat, 20 Nov 2010 17:20:53 -0800, Shel wrote: > Sorry I wasn't clear about the db part. Most of the data has already > been written and/or generated and tested with the code. I do plan to > finish all the database stuff before going to the front end, but am just > thinking ahead about how to do the interface. > That sounds good. Sorry if I was repeating stuff you already know, but it wasn't obvious what you knew about care & feeding of an RDBMS. I'll just add two comments on databases: - Decompose the database design to 3NF form and make sure all prime and foreign keys have indexes. This is stuff that previous experience shows self-taught Access users don't do. Not doing it will bite you hard on performance as soon as the tables exceed a few rows in size. Fixing it later can force major changes to the programs as well. - If you haven't looked at it yet, find out about the EXPLAIN verb and what its output means. Use it on all queries that your online program issues and take notice of how rearranging the query and/or adding/changing indexes affects the cost of the query. Lower cost queries mean higher performance and hence faster response times. What I meant to add last night is that, if your application is to be used by more than a single user at a time a prime consideration is how you will recognise input received from each user and how you'll store their context between interactions with them in the same session and keep each session's context separate. The web server doesn't do this, so this managing session context is the application's responsibility. Common methods are to use a session cookie and/or to store session context in the database. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | -- http://mail.python.org/mailman/listinfo/python-list
Re: Printing from Web Page
On Sun, Nov 21, 2010 at 5:35 AM, FELD Boris wrote: > I think the best way to do this is using css with specific media type. > Take a look at : http://martybugs.net/articles/print.cgi > Oh, man, this is perfect! Thanks! beno -- http://mail.python.org/mailman/listinfo/python-list
Questions about optmodel constraints
I have three questions: 1. If I have a variable that is stored in a data set and I want to formulate only one constraint (under optmodel) that is a function of all the data set's observations of this variable and a decision variable. Suppose the variable is a and x is the decision variable. My constraint is: [(maximum value of a) +x ] / [(minimum value of a) +x ] < maximum value of (a) / minimum value of (a), can you help me to include this constraint under optmodel? 2. If there is one scalar number that is a result of certain calculations and the it is stored in a dataset and I want to equate a constraint with this scalar, can you help me to do this? 3. If there is one scalar number that is a result of certain calculations and it is stored in a dataset and I want to include this scalar in "sum" operator. Suppose there are also two stored variables that are a and b, and x is a decision variable and the scalar is c, I want c to appear as in the following constraint: sum over i for [ c*(ai)^2 * bi/ (ai+x)] = 0.5 , can you help me to do this under optmodel? Thanks Ayaa -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
"Ertugrul Söylemez" wrote in message news:20101014052650.510e8...@tritium.streitmacht.eu... That's nonsense. Actually namekuseijin is right. You really need to persevere and familiarize yourself with some of the other languages out there. Haskell is many things but simple is not one of them. If Haskell were half of the things you think it is, it would have more credible success stories. Cheers, Jon. -- http://mail.python.org/mailman/listinfo/python-list
Re: Inserting class namespace into method scope
On 11/20/2010 4:59 PM Steven D'Aprano said... On Sun, 21 Nov 2010 08:59:30 +1100, Ben Finney wrote: C'mon, Steven, you know the drill. If you want us to help you solve a problem, don't start with “I want to use this behaviour that seems loony, and I won't say why”. Instead, help us by telling us what problem you're trying to solve. Well, I tried the TL;DR version. Now you have to read the full version. Inspired by the last maxim of the Zen: "Namespaces are one honking great idea -- let's do more of those!" Hmm... while playing with various takes on globals and code blocks I came across this that may be of interest. http://www.voidspace.org.uk/python/articles/code_blocks.shtml Emile -- http://mail.python.org/mailman/listinfo/python-list
Re: is list comprehension necessary?
In article <4cc701e7$0$1606$742ec...@news.sonic.net>, John Nagle wrote: > >Python isn't a functional language. It has some minimal functional >capabilities, and there's a lobby that would like more. So far, that's >mostly been resisted. Attempts to allow multiline lambdas have been >averted. The weird "functional if" syntax additions were a cave-in to >the functional crowd, and may have been a mistake. Did you actually read the PEP explanation for *why* Guido decided to add conditional expressions? -- Aahz (a...@pythoncraft.com) <*> http://www.pythoncraft.com/ "Look, it's your affair if you want to play with five people, but don't go calling it doubles." --John Cleese anticipates Usenet -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Pygoogle allows for advanced search options?
Hello ALL! I am playing with the modified version of the Pygoogle (by Stefan). Interesting thing is that get_result_count() gives numbers/results different from those in Google. Has anyone checked this? Does anyone know why? Best, Petar -- http://mail.python.org/mailman/listinfo/python-list
Re: Pickling a database cursor?
On 11/20/2010 10:30 PM, Chris Rebert wrote: On Sat, Nov 20, 2010 at 10:08 PM, Navkirat Singh wrote: Hi Guys, Is there any way to pickle a database cursor? I would like a persistent cursor over multiple HTTP requests. Any help would be awesome ! You can't. It's like a file handle in that respect. Cheers, Chris -- http://blog.rebertia.com I've seen several related questions on this from the same person. A few hints: I suspect that what you're trying to do is to display a sequence of records from a database in page-sized groups. There's a way to do that. In SQL, look into the OFFSET and LIMIT clauses. The idea is that if you want the first 10 entries, your SQL statement has OFFSET 0 and LIMIT 10. For the next 10, you use OFFSET 10 and LIMIT 10, and so on. For this to work, your SQL statement needs a ORDER BY clause, so the records come out in the same order each time. And you need to define an INDEX on the fields used in the ORDER BY clause, or the database engine has to sort the file every time, which is really slow. The usual way to do this with web pages is to use REST-type parameters in the URL. So you'll have a URL like http://www.example.com/cgi/getrecords.cgi?q=customerid&offset=0&limit=10 On the pages you return, you put URLs for "next page" (with a bigger offset) and "previous page" (with a smaller offset). That way, the user can move forwards and backwards through the pages. You have to read those parameters from the URL and put them into the SQL. (For OFFSET and LIMIT, you have to edit those parameters into the SQL string itself, because those numbers aren't placed in quotes. You can't use the second parameter to cursor.execute for this. So, when you fetch those parameters, convert them to numbers with "int(s)" before putting them into the SQL statement. Otherwise, you'll have an SQL injection vulnerability.) Page through some Google search results and watch how the URLs change. That's how Google does it. Don't use cookies for position information. The browser's "Back" button won't do what users expect if you do that. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
multiple times subprocess fails on windows
Hello, in a test suite in my project (called rvirtualenv [1]) I discovered a strange behaviour when calling from python a batch file which calles another python and this calles a shell command. [1] http://github.com/kvbik/rvirtualenv I know it sounds pretty strange, but I do this only because I am testing such specific tool (that has similar functionality like original virtualenv and there are things like activate.bat commands). I've uploaded some code snippet here: https://gist.github.com/709004/6ccc44d6aed5fe694bb2adbef2400bbea92998a1 If anyone could explain me this behaviour I would be more than happy, because right now it is the only failing test in my project ;). Thanks in advance, Jakub.. -- http://mail.python.org/mailman/listinfo/python-list
Strange affinity side effect with multiprocessing.
Hi Everyone, I'm having a strange problem with the multiprocessing package and Panda3D. Importing panda modules causes multiprocessing to only use one of my cores. I've created an example test case. It uses an infinite loop to ping the cores so you'll have to manually kill the python processes. So if I run the following I can see in my task manager that both cores are at 100%. Code: #from pandac.PandaModules import Point2 from multiprocessing import Pool def dummyWorker(a): while True: continue class DummyTester(object): def __init__(self): self.pool = Pool(2) def go(self): result = self.pool.map_async(dummyWorker, range(2)) result.get() if __name__ == "__main__": DummyTester().go() But if I uncomment out that one line there it only uses one of my cores. This is with a fresh download of panda 1.7.0 on windows xp, python 2.6, and intel core2 duo. I'm completely at a loss so any thoughts would be greatly appreciated. Thx. -Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Pygoogle allows for advanced search options?
Am 21.11.2010 20:35, schrieb Petar Milin: Hello ALL! I am playing with the modified version of the Pygoogle (by Stefan). Interesting thing is that get_result_count() gives numbers/results different from those in Google. Has anyone checked this? Does anyone know why? Best, Petar AFAIK there are several reports which point to the same observation; even time & location (requesting IP) seem to generate different results. <>-- http://mail.python.org/mailman/listinfo/python-list
Re: Does Pygoogle allows for advanced search options?
So, what can one do about this? There seems to be at least two aspects: (a) difference between browser-based and script-based (pygoogle in this case) query, and (b) difference in time and place, but possibly within the same query type. If so, how can we be sure? It would be interesting (at least to me) to check for the correlations between numbers. That would answer whether there is some/any consistency. Best, Petar - Original message - > Am 21.11.2010 20:35, schrieb Petar Milin: > > Hello ALL! > > I am playing with the modified version of the Pygoogle (by Stefan). > > Interesting thing is that get_result_count() gives numbers/results > > different from those in Google. Has anyone checked this? Does anyone > > know why? > > > > Best, > > Petar > > > AFAIK there are several reports which point to the same observation; > even time & location (requesting IP) seem to generate different results. > > stefan_sonnenberg.vcf -- http://mail.python.org/mailman/listinfo/python-list
Re: building a web interface
Definitely not looking to reinvent the wheel. Will check these out, thanks! Shel On Nov 20, 9:50 pm, Ian Kelly wrote: > On 11/20/2010 3:40 PM, Shel wrote: > > > So right now I have a mySQL db structure and some Python code. My end > > goal is to create a browser-based interactive fiction/game thing. My > > code is currently just using dummy data rather than pulling in data > > from the db, but I think/hope it won't be too big of a deal to > > interact with the db through Python (famous last words...). > > Suggestion: unless you're intent on reinventing the wheel, why not just > set up your web interface as a thin front-end for an existing IF engine? > An excellent starting point for this would be digging up the source > for InfocomBot [1], an AIM bot that acts as a simple wrapper around > Frotz [2]. My recollection of seeing the source once is that it was > only around 50 or so lines of code. Doing it this way, > > 1) You don't have to write an IF engine from scratch. > > 2) If you wrap Frotz specifically, you can serve any Z-code game ever > written, including (I think) all of the Infocom games. > > 3) You can create your game using powerful existing development tools, > such as Inform [3]. > > Cheers, > Ian > > [1]http://waxy.org/2004/03/infocombot_for/ > [2]http://frotz.sourceforge.net/ > [3]http://inform7.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: constructin trees in python
> Thanks a lot peter, that worked as i needed. Where can i find some
> good documentation which explains such behavior.
The reason for this behavior is the way python stores attributes.
Both a class and an instance of a class have a __dict__ attribute
which is a dictionary which stores attributes in name value pairs.
Consider the following class.
class A(object):
a = 1
def __init__(self, b):
self.b = b
Inspecting A.__dict__, one will see that it looks like {'a': 1} with
no reference to b.
Instantiating with a = A(2), one will see that a.__dict__ is {'b': 2}
with no reference to a.
If one accesses a.b, then Python will first look in a.__dict__ and
find 'b'. It will then return that value for a.b
If one instead accesses a.a then Python will first look in a.__dict__
and not find an entry for 'a'. It will then look in type(a).__dict__
== A.__dict__, find 'a' and return it for a.a
One can in fact use this behavior to shadow class attributes. If the
__init__ function is changed to
def __init__(self, a, b):
self.a = a
self.b = b
then all instances of A will have their own instance attribute named a
with whatever value is passed to __init__. They will still have a
class level attribute named a with value 1 but Python will never see
it because it will find an entry for a in some_instance.__dict__. If
one executes
del some_instance.a
Then on that one instance, visibility for the class level a will be
restored. In fact, one can always get the class level instance as
type(some_instance).__dict__['a'] but that's a little awkward.
The reason that this matters with mutable attributes and not with
(often) with immutable attributes is that a statement of the form
some_instance.some_mutable_attribute.append(foo)
will reference the same class level attribute regardless of the
instance it's called with. There's no assignment going on here. An
existing binding is being looked up, and the resulting value (a list
in this case) is having an attribute called on it. No new bindings are
being created. A statement of the form
some_instance.some_mutable_attribute = some_new_list
Will not affect the class level attribute at all but will simply
shadow it in the same manner as describe above. Once a name is bound
to an immutable value, the only way to change the value that it points
to is to rebind it. This means that any 'change' to a class level
immutable value (accessed through attribute lookup on an instance)
will simply shadow it on the instance upon which it is accessed.
HTH
--
http://mail.python.org/mailman/listinfo/python-list
Re: building a web interface
No worries at all about repeating things. I wasn't clear, and I appreciate your going to the trouble of teaching me just about anything. Even things I think I know, I might not really know :-) Let's see... am okay with the relational design stuff. Thanks for the "EXPLAIN" verb. I am confused about multiple simultaneous users, which I would like to be able to accommodate. On the db side, I have a structure to store data for each user, and know a bit about selectively locking data, although I have not implemented that yet, so will see what happens. I don't really get how multiple users work in terms of pretty much everything else, like if the Python code is running on the server, then... well, I just don't know. Maybe I should try to get it running for multiple discrete users first, and then think about simultaneous users, or is that a bad way to go about things? Or maybe it will start to make more sense when I get into building the interface? Any info/suggestions are very welcome. Thanks again! Shel On Nov 21, 4:51 am, Martin Gregorie wrote: > On Sat, 20 Nov 2010 17:20:53 -0800, Shel wrote: > > Sorry I wasn't clear about the db part. Most of the data has already > > been written and/or generated and tested with the code. I do plan to > > finish all the database stuff before going to the front end, but am just > > thinking ahead about how to do the interface. > > That sounds good. Sorry if I was repeating stuff you already know, but it > wasn't obvious what you knew about care & feeding of an RDBMS. I'll just > add two comments on databases: > - Decompose the database design to 3NF form and make sure all prime > and foreign keys have indexes. This is stuff that previous experience > shows self-taught Access users don't do. Not doing it will bite you > hard on performance as soon as the tables exceed a few rows in size. > Fixing it later can force major changes to the programs as well. > > - If you haven't looked at it yet, find out about the EXPLAIN verb > and what its output means. Use it on all queries that your online > program issues and take notice of how rearranging the query and/or > adding/changing indexes affects the cost of the query. Lower cost > queries mean higher performance and hence faster response times. > > What I meant to add last night is that, if your application is to be used > by more than a single user at a time a prime consideration is how you > will recognise input received from each user and how you'll store their > context between interactions with them in the same session and keep each > session's context separate. The web server doesn't do this, so this > managing session context is the application's responsibility. Common > methods are to use a session cookie and/or to store session context in > the database. > > -- > martin@ | Martin Gregorie > gregorie. | Essex, UK > org | -- http://mail.python.org/mailman/listinfo/python-list
[ANN] Pyro 3.11 released
Hi, Pyro 3.11 has been released! Pyro is a an advanced and powerful Distributed Object Technology system written entirely in Python, that is designed to be very easy to use. Have a look at http://www.xs4all.nl/~irmen/pyro3/ for more information. Highlights of this release are: - improved compatibility with Jython - fixed some threading problems regarding proxy connections - fixed a threading issue that could break COM calls - persistent mode nameserver improved As always the detailed changes are in the change log chapter in the manual. More info and download link available in PyPI: http://pypi.python.org/pypi/Pyro/ Enjoy, Irmen de Jong -- http://mail.python.org/mailman/listinfo/python-list
Re: building a web interface
On Sun, 21 Nov 2010 15:40:10 -0800, Shel wrote: > I am confused about multiple simultaneous users, which I would like to > be able to accommodate. On the db side, I have a structure to store > data for each user, and know a bit about selectively locking data, > although I have not implemented that yet, so will see what happens. > I realise what I wrote last night wasn't all that clear. Terms: 'transaction' and 'session'. A web server 'transaction' consists of a request from a user that results in a page being sent to the user. That's it. It is an isolated action that does not depend in the web server knowing anything about the user because all the information it needs to decide which page to send was supplied when the user sent in the URL of the page. Now if the user clicks on a link on that page, his browser sends the URL in the link to the server, which in turn fishes out another page and sends it back to the user. As far as the server is concerned, there is no connection whatever between the two requests: either or both URLs could have been copied from a piece of paper for all it knows or cares. There is no concept of context or a session involved. A 'session' involves context. Think of what happens when you login to a computer. That starts a login session that has context: the computer now knows who you are and provides context by connecting you to your login directory and opening some work space which is used to remember which directory you're in, what commands you issued (so you can look at the history), etc. The session and its context persists until you log out. In what you're intending to do, a user will start a session by starting to use your program and that session will last until the user disconnects from the session. All the web server knows is that instead of finding a page on disk some place it passes your user's request to your program and sends its output, in the form of a web page, back to the user. It does this each time it receives a request from the user because all the user's requests contain the same URL - that of your program. The server does this without knowing there is such a thing as a session or that there is any context belonging to the user. The upshot is that your program has to keep track of all the active sessions and maintain context for each active session. It also needs a way to recognise and get rid of dead sessions because sessions don't always end cleanly: the line may go down or the user may forget he was using your program and turn his PC off. For instance, if the session context has a timestamp, you might delete it after, say, 20 hours of inactivity, or when the user logs on again. If the data is sensitive, you might also force a new logon after 10 minutes of inactivity. The database is as good a place as any for keeping session and context data - if its well structured the context may well form a single (large) row on one table, but you do need a unique key for it. That could even be the login name provided you're able to include it in every page you send to the user and can guarantee that the browser will send it back as part of the next request. A hidden field on the page will do this automatically. The basic program cycle will be: - receive a request - read the context for the session - use data in the request to carry out the requested action - write the updated context back to the database - create the output page and send it to the user though of course you need additional dialogue to deal with both valid and invalid logons and logoffs. > I don't really get how multiple users work in terms of pretty much > everything else, like if the Python code is running on the server, > then... well, I just don't know. > Hopefully the above made it a bit clearer. > Maybe I should try to get it running > for multiple discrete users first, and then think about simultaneous > users, or is that a bad way to go about things? Or maybe it will start > to make more sense when I get into building the interface? Any > info/suggestions are very welcome. > For bare desktop development I would split the program into three parts: 1) the program itself, written to run a single transaction each time its called. Inputs would be the bits of the users message it needs to act on and the current session context record. 2) a testing harness that accepts user input from the console, sends output back to the console and maintains a single session context record in memory: IOW it runs your program in single user mode. 3)the web server interface which retrieves the session context record, passes it and the input to your program and, after that has run, saves the session context record and passes the output to the web server for delivery to the user. This way both 2 and 3 can be developed against a really simple 'do almost nothing' version of 1 while that in turn can be developed and tested on your desktop using 2 and later be d
How to open html page in python resource file? ActiveX and Java script addEventListener? Options
Hi friends, I have an interesting question. Is it possible to open HTML page from python resources (Sorry, I don't know how to use the resources) like we can open using Win32 from .rc files. Can that page contain references to scrips in the resource file? Another question is reagrding ActiveX on win32. ActiveX usually calls Java Script function to notify. In webpage we can add it using document.addeventlistener but those are not available using CallFunction method of ActiveX. But if we decided to use it directly (without web browser) then how can we register Listeners? There must be some way to specify the listeners. Thanks in Advance. -- http://mail.python.org/mailman/listinfo/python-list
strings getting unnecessarily cut in lstrip
I was using the lstrip to trim the left occurance of a string, and it didnt seem to work for some cases. but when i investigated there does seem to be an issue with some combination of strings here is one case p1 = "abcd" p2 = 'def'# $abc sym = '_' str1 = p1 + sym + p2 str1 = str1.lstrip(p1+sym) print str1 # this prints ef instead of def can someone explain why this is happening ? -- http://mail.python.org/mailman/listinfo/python-list
Re: strings getting unnecessarily cut in lstrip
On 11/21/2010 10:12 PM, Maxim Mercury wrote: > I was using the lstrip to trim the left occurance of a string, and it > didnt seem to work for some cases. but when i investigated there does > seem to be an issue with some combination of strings > here is one case > p1 = "abcd" > p2 = 'def'# $abc > sym = '_' > str1 = p1 + sym + p2 > str1 = str1.lstrip(p1+sym) > print str1 # this prints ef instead of > def > > can someone explain why this is happening ? It's happening because the argument specifies a set of characters, not a string. So the "d" of "def" is removed because there's a "d" in "abcd_". If you want to remove a string, try testing is with its .startswith() method and them removing the right number of characters. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon 2011 Atlanta March 9-17 http://us.pycon.org/ See Python Video! http://python.mirocommunity.org/ Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: CGI FieldStorage instances?
Gnarlodious wrote:
>
>I'm having a hard time understanding this, can someone explain?
>
>Running a CGI with query string:
>
>?action=Find&page=Data
>
>Script includes these lines:
>
>form=cgi.FieldStorage(keep_blank_values=1)
>print("Content-type:text/html\n\n")
>print(cgi.print_form(form))
>
>Output:
>
>Form Contents:
>
>action:
>MiniFieldStorage('action', 'Find')
>page:
>MiniFieldStorage('page', 'Data')
>
>It looks like every variable in the query string instantiates a
>MiniFieldStorage with that value, is that the case?
Yes, unless it's a "file" type, then it is a full FieldStorage.
>And if so, what
>sort of cool tricks could I do with that feature? Because so far I am
>doing CGI and it is a big old mess. Intercepting every variable is
>complicated and confusing. Is there an easier way?
Have you looked at the source code? That's the beauty of Python. It's all
exposed for you. MiniFieldStorage has a .name attribute and a .value
attribute. So, for example:
print form['action'].value
print form['page'].value
If you're not sure whether the value will be specified:
if 'action' in form:
action = form['action'].value
--
Tim Roberts, t...@probo.com
Providenza & Boekelheide, Inc.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
"Jon Harrop" wrote: > "Ertugrul Söylemez" wrote in message > news:20101014052650.510e8...@tritium.streitmacht.eu... > > > That's nonsense. > > Actually namekuseijin is right. You really need to persevere and > familiarize yourself with some of the other languages out > there. Haskell is many things but simple is not one of them. If > Haskell were half of the things you think it is, it would have more > credible success stories. Jon, I don't care about your opinion, because it's biased. If you were to advocate Haskell in any way, you would lose money. So you must fight it where possible. This makes all your postings about Haskell (and many other languages) meaningless and reading them a waste of time. Haskell is a simple language with a comparably small specification. It's not as simple as Common Lisp, but it's simple. Note that simple doesn't mean easy. Haskell is certainly more difficult to learn than other languages, which explains the low number of success stories. On the other hand, I'm doing rapid web development in it. After all there aren't many CL success stories either, but Paul Graham's story [1] speaks for itself. [1] http://www.paulgraham.com/avg.html Greets, Ertugrul -- nightmare = unsafePerformIO (getWrongWife >>= sex) http://ertes.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On 11/21/2010 11:38 PM, Ertugrul Söylemez wrote: > "Jon Harrop" wrote: > >> "Ertugrul Söylemez" wrote in message >> news:20101014052650.510e8...@tritium.streitmacht.eu... >> >>> That's nonsense. >> >> Actually namekuseijin is right. You really need to persevere and >> familiarize yourself with some of the other languages out >> there. Haskell is many things but simple is not one of them. If >> Haskell were half of the things you think it is, it would have more >> credible success stories. > > Jon, I don't care about your opinion, because it's biased. If you were > to advocate Haskell in any way, you would lose money. So you must fight > it where possible. This makes all your postings about Haskell (and many > other languages) meaningless and reading them a waste of time. > > Haskell is a simple language with a comparably small specification. > It's not as simple as Common Lisp, but it's simple. Note that simple > doesn't mean easy. Haskell is certainly more difficult to learn than > other languages, which explains the low number of success stories. On > the other hand, I'm doing rapid web development in it. > > After all there aren't many CL success stories either, but Paul Graham's > story [1] speaks for itself. > > [1] http://www.paulgraham.com/avg.html > Perhaps we could take this thread to alt.small.minded.bickering now? regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon 2011 Atlanta March 9-17 http://us.pycon.org/ See Python Video! http://python.mirocommunity.org/ Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Sun, 21 Nov 2010 23:57:21 -0500, Steve Holden wrote: > Perhaps we could take this thread to alt.small.minded.bickering now? Alas, my ISP doesn't carry that newsgroup. Where else can I get my mindless off-topic bitching if not for cross-posts from comp.lang.scheme and comp.lang.functional? *wink* -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: How to open html page in python resource file? ActiveX and Javascript addEventListener? Options
Hello! You will find (positive) answers in PyWin32 and his examples. @-salutations -- Michel Claveau -- http://mail.python.org/mailman/listinfo/python-list
Re: is list comprehension necessary?
On 10/27/2010 05:37 AM, Roy Smith wrote: > I agree. I resisted LCs when they first came out, passing them off as > unnecessary, confusing, etc. Eventually, I came to be comfortable with > them and use them often. I do use LCs fairly often, but only then a for loop would be ugly or inefficient. In many cases, I find a normal for loop often is clearer. Basically I'm saying that you can over-use LCs. And sometimes LCs only serve to make code harder to read. Just because you can use an LC doesn't always mean you should. But of course that's just my opinion. -- http://mail.python.org/mailman/listinfo/python-list
Re: is list comprehension necessary?
On Tue, Oct 26, 2010 at 3:31 AM, Xah Lee wrote: > ... No, list comprehensions are not "nececessary", just like the plethora of expletives in the majority of your OPs on this list are not necessary. The question is are they useful, and the answer is the case of list comprehensions is obviously yes, whereas in the case of the expletives you love to spew everywhere the answer is no. Framing, young grasshopper. Framing. -- http://mail.python.org/mailman/listinfo/python-list
