🌐 Mailman 3 July 2003 - Python-list - python.org

urllib(2) and https blues? try pytunnel for python tunnelling
by pyguy30＠yahoo.com Aug. 1, 2003

Aug. 1, 2003

The python libraries like urllib and httplib do not support ssl through a proxy. Urllib2 supports http through a proxy or https alone, but not https through a proxy. A while ago my wife complained to me that perl had trouble w/https. I was surprised since perl has a lot of networking libraries. Preferring python, I took a look a python and found the same problem. Eventually I figured out what python was missing: tunnelling. Though she may _coax_ me to port the code to perl, I'm writing it first in my favorite language. Pytunnel offers a tunnel that can be used for (among other things) tunnelling the ssl through a proxy. I'd be willing to offer suggestions or myself add the necessary code to urllib2. Anyone know how one goes about doing either? Your python code does not need to be changed except that the port and ip are supplied by the tunnel. Pytunnel uses a custom recvall which is like sendall but for recv. Recvall uses non-blocking sockets,timeouts and sleeps to attempt to get all of the data. If you have a bad network connection you'd want to set the timeout to be high. Recvall will probably be slower than a standard recvall. The code is rough and needs better error handling, comments and such. But since I got it working I decided to post it. You can find it at: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/213238 Example of usage: import pytunnel,httplib def tunnel_this(ip,port): conn = httplib.HTTPSConnection(ip,port=port) conn.putrequest('GET', '/') conn.endheaders() response = conn.getresponse() print response.read() tunnel=pytunnel.build(host='login.yahoo.com',proxy_host='h1',proxy_user='u',proxy_pass='p') tunnel.run(tunnel_this)

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Problem with inserting dates using mx.ODBC.Windows driver
by Fons Dijkstra Aug. 1, 2003

Aug. 1, 2003

Hello, I'm using the mx.ODBC.Windows package in order to read/write a MSAccess database. Everything works fine apart from the DATE format handling. I'm using the default "datetimeformat" (i.e. DATETIME_DATETIMEFORMAT) as suggested. The date columns in the MSAccess database have "Short Date" format. When I read a DATE item everything works fine, like: >>> conn = mx.ODBC.Windows.connect(database) >>> cursor = conn.cursor() >>> cursor.execute("SELECT * FROM table") >>> data = cursor.fetchall() >>> print data [(..., <DateTime object for '2003-07-31 00:00:00.00 at address>, ...)] But when I try to update the table I get a ProgrammingError, like: >>> date = mx.ODBC.Windows.Date(2003, 07, 31) >>> conn = mx.ODBC.Windows.connect(database) >>> cursor = conn.cursor() >>> cursor.execute("INSERT INTO table (..., DATE, ...) VALUES (..., ?, ...)", (..., date, ...)) ProgrammingError: Syntax Error in INSERT INTO statement. Is it possible to use the mx.DateTime type for MSAccess databases? If so, how should it be done? If not, how can I insert dates into a MSAccess database? Thank you in advance, Fons

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RE: Python's biggest compromises
by sismex01＠hebmex.com Aug. 1, 2003

Aug. 1, 2003

> From: akhleung(a)earthlink.net [mailto:akhleung@earthlink.net] > Sent: Jueves, 31 de Julio de 2003 01:41 p.m. > > It seems to me that a big compromise/feature is that all kinds of > namespaces are usually represented by dictionaries, and that Python > exposes this fact to the programmer. This would seem to limit the > possible optimizations that can easily be performed by a compiler. > > BTW, I have only read about Python out of interest, and haven't > actually used it for anything, so I hope my remark isn't ignorant. > > Best regards, > Aaron > Hello Aaron. Actually, this which you call a compromise, is one of Python's biggest strengths: it allows you, as a programmer, to perform many things which in other languages would be simply impossible, or at least would force you to jump through plenty loops and hoops. Take a look at Alex Martelli's Borg pattern, it shows what can be done by having open access to class *and* object namespaces, and being able to manipulate them. In Python it's easy and straightforward (eek), but in other languages, well... you have whole books dedicated to that. We're all adults, and all that. :-) -gustavo Advertencia:La informacion contenida en este mensaje es confidencial y restringida, por lo tanto esta destinada unicamente para el uso de la persona arriba indicada, se le notifica que esta prohibida la difusion de este mensaje. Si ha recibido este mensaje por error, o si hay problemas en la transmision, favor de comunicarse con el remitente. Gracias.

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Re: handle <BR> tags
by Behrang Dadsetan Aug. 1, 2003

Aug. 1, 2003

Luca Calderano wrote: > Hi guys... > > I've done a subclass of SGMLParser > to handle the contents of a web page, > but i'm not able to handle the <BR> tag > > can someone help me??? > > S.G.A S.p.A. > Nucleo Sistemi Informativi > Luca Calderano > > I do not know SGMLParser.. but HTML is not SGML nor any subset. It is some ill language which one even rarely finds "pure" (written in the way the spec says it MUST be) I believe SGML does not like none closing tags. BR is one of the many none closing tags in HTML (also look at IMG or HR) Depending on what you are doing you should maybe use XHTML as an input if you can (XML well-formed HTML, XML being a subset of SGML) or you should probably look for a completely different parser "technology". Maybe HTMLParser will help you a little more. Do not forget, random downloaded HTML from Internet is often broken. You might rather want to use tidylib (corrects broken HTML code into XHTML) and a XHTML/SGML parser or a DOM. Hope it helps even though the effort I took to check my statements was small :) Regards, Ben.

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Re: Exceptions as New Style Classes
by Carl Banks Aug. 1, 2003

Aug. 1, 2003

Steven Taschuk wrote: > Quoth Carl Banks: >> Steven Taschuk wrote: >> > At the moment the dominant idea for solving these problems is to >> > make inheritance from Exception mandatory for exception types; see > [...] >> Why not give exceptions their own metaclass? So if type(x) is >> ExceptionMetaclass, it's a class. If type(type(x)) is >> ExceptionMetaclass, it's an instance. Otherwise, it's illegal to >> raise it. > > That seems workable. (I'd prefer, though, to test > isinstance(type(x), ExceptionMetaclass) > and likewise for the second case.) > > I'm not sure what it gains us, though, over the idea of mandatory > inheritance from Exception. Am I missing something? Probably not much, unless you think you want to raise exceptions that aren't subclasses of Exception. -- CARL BANKS

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How to get Windows physical RAM using python?
by Mark Aug. 1, 2003

Aug. 1, 2003

Thanks.

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Re: time, calendar, datetime, etc
by Ben S Aug. 1, 2003

Aug. 1, 2003

Steven Taschuk wrote: > Quoth Kylotan: > [...] >> And does datetime.timetuple() actually return something equivalent to >> a struct_time as used by the time module? At first glance this looks >> to be true, but it isn't clearly documented as such. > > Isn't it? > > timetuple() > Return a 9-element tuple of the form returned by > time.localtime(). > > <http://www.python.org/doc/current/lib/datetime-datetime.html> Problem is, time.localtime() doesn't return a 9-element tuple any more, it returns a struct_time. (Since 2.2, I think.) -- Ben Sizer http://pages.eidosnet.co.uk/kylotan

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<dict>.setdefault()
by Tino Lange Aug. 1, 2003

Aug. 1, 2003

Hi! I just realized that <dict>.setdefault *always* executes the second argument - even if it's not necessary, because the requested item in the first argument exists. This is not what I expected - why evaluate the second argument if it's not needed? Also this can lead to side-effects! Example: >>> a = {} >>> b = {} >>> a.setdefault(1,b.setdefault(1,1)) 1 '1' didn't exist in a - so I expect 'b.setdefault(1,1)' to be evaluated. Great. >>> a.setdefault(1,b.setdefault(2,1)) 1 '1' existed, so it's not necessary to evaluate 'b.setdefault(2,1)'. But: >>> b {2: 1, 1: 1} ... shows that it was executed! So it's not equivalent to: if 1not in a: b.setdefault(2,1) Is this really by design? If there's a complicated, expensive to calculate/build 2nd argument (maybe a function call) then it's also quite ineffective to evaluate it just to throw away... Thanks! Tino

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Retrieve source filename
by Shrom Aug. 1, 2003

Aug. 1, 2003

Hi, I know that you can retrieve main file name with sys.argv[0] and file name for a module with modulename.__file__ but is there a common way to retrieve file name for both main program and modules as the __FILE__ constant in PHP ?

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What does "*list" mean?
by smethells＠llnl.gov Aug. 1, 2003

Aug. 1, 2003

What exactly does "*values" mean in the following code? Is this a pointer to a PyList? Why can I not find good documentation on this any where? I must be blind: >>> from struct import * >>> format = "dl" >>> values = [3.14, 42] >>> foo = pack(format, *values) >>> foo '\x1f\x85\xebQ\xb8\x1e\t@*\x00\x00\x00' >>> unpack(format, foo) (3.1400000000000001, 42) >>> More importantly still, how would you write the same code in C? If you wanted to instead call struct_pack(PyObject *tuple), what would the tuple look like in C? Thanks to anyone who can clear all this up for me. Greg

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