🌐 Mailman 3 January 2004 - Python-list - python.org

numarray and NumarrayType
by Marco Bubke Jan. 31, 2004

Jan. 31, 2004

Hi I have a little problem mit numarrays type. I want to get the Type but its noch the right one. If I array.typecode() I get the right one but there is not a typecode for all types. I geht the same type fer float and double? Thats wrong. Its a bug by me or numarray? Here is the code. The array is of type 'Float32" but I get tFloat64. cdef int numarray_type numarray_type = NA_NumarrayType(flat_array) if numarray_type == tFloat32: self.type = GL_FLOAT elif numarray_type == tFloat64: self.type = GL_DOUBLE elif numarray_type == tUInt32: self.type = GL_UNSIGNED_INT elif numarray_type == tInt32: self.type = GL_INT elif numarray_type == tUInt16: self.type = GL_UNSIGNED_SHORT elif numarray_type == tInt16: self.type = GL_SHORT elif numarray_type == tUInt8: self.type = GL_UNSIGNED_BYTE elif numarray_type == tInt8: self.type = GL_BYTE else: assert 0, "can't convert numarray type to opengl type" regards Marco

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TCP server as a Windows service using Python?
by David Mitchell Jan. 31, 2004

Jan. 31, 2004

Hello group, I'm trying to create a TCP server using Python, and I want it to run under Windows as a service. Now, I'm fine with building the TCP server using Python - done it lots of times, and I know there's lots of sample code out there I can grab if I ever need to. Equally, I think I've got the simpler concepts about creating Windows services using Python clear. I've got the Python Win32 book, worked through the example code in there and haven't had any real problems with it. Where I'm having trouble is with the overlapped I/O call. When I create a TCP server, I need to have it sit there waiting for a client connection. With a Windows service, it has to sit there waiting for administrative messages such as e.g. a "stop service" message. The example code in the Python Win32 book uses named pipes to do IO - I'm constrained to using TCP sockets. I can't see how to let the service accept *either* an incoming TCP client connection *or* an e.g. "stop service" message. If someone could point me to some sample code, I'd greatly appreciate it - Google hasn't been helpful. Thanks in advance Dave M.

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Re: Python vs. Io
by John Roth Jan. 31, 2004

Jan. 31, 2004

"Paul Prescod" <paul(a)prescod.net> wrote in message news:mailman.1078.1075571238.12720.python-list@python.org... > Daniel Ehrenberg wrote: > > "Sean Ross" <sross(a)connectmail.carleton.ca> wrote > > > \> > > I'm not sure how to tell you this so I'll just give a heavily > > commented example (comments in Io are with #, //, or /* */) > > > > parentProto := Object clone //makes parentProto a new object > > //:= is used for creating new variables > > parentProto shared := 5 //parentProto's new slot shared holds 5 > > Do you know why the creator of IO decided not to use the now-ubiquitous > "." operator? I don't know whether I can define a "." operator that has > the appropriate behaviour but that wouldn't help anyhow. As far as I know, since everything is a "message send", the dot is unnecessary. Every operation is either object.paremeter(s), or syntactic sugar that gets transformed into that format. John Roth > > Paul Prescod > >

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Majordomo results: Hi
by majordomo-owner＠csl.sri.com Jan. 31, 2004

Jan. 31, 2004

>>>> The message contains Unicode characters and has been sent as a binary attachment. **** Illegal command! No valid commands processed. >>>> File attachment: body.pif **** Illegal command! No valid commands processed.

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problem with weakref.proxy
by Walter Haslbeck Jan. 31, 2004

Jan. 31, 2004

Hello, I'm a completly Python newbie. As a first learning project I want to port an game-engine I have writte some time ago in pure C to Python using OO methods. So I created a base-class 'GOb' (GameObject). This class should have a sorted list of all instances stored as as class-attribte __olist[]. When I add a reference of the new created object in the constructor (with GOb.__olist.append(self)) I have 2 references to each created instance and if I 'del' the instance the destructor is not called, because __olist[] holds another reference to that object. Now I got to tip to use the weakref module. Well I thought this should be exactly what I need and changed the program to add not a reference to the instances but a weakref.proxy. So now my instances are deleted really deleted when I use 'del', but: How do get corresponding weakref.proxy object out of __olist[]? I tried to use the callback parameter from weakref.proxy, but at the time when the callback takes place, the proxy object is allready 'dead', I get an Exception when I try to remove the proxy-instance from __olist[]: Exception exceptions.ReferenceError: 'weakly-referenced object no longer exists' in <function proxy_callback at 0x4040c02c> ignored And if I iterate throu all objects in __olist[] I get an 'ReferenceError: weakly-referenced object no longer exists' please look at the following source: ################################################################################ import weakref class GOb: __olist=[] def c_show_all(): print "all GObs, sorted by priority:" for i in GOb.__olist: i.show() def proxy_callback(x): print "weakref.proxy callback" GOb.__olist.remove(x) proxy_callback=staticmethod(proxy_callback) c_show_all=staticmethod(c_show_all) def __init__(self, name="GOB", priority=0): self.priority=priority self.name=name ref=weakref.proxy(self, GOb.proxy_callback) GOb.__olist.append(ref) GOb.__olist.sort() def __del__(self): print "Destruktor called for GOB " + self.name def show(self): print self.name + " " + str(self.priority) def __cmp__(self, other): if self.priority < other.priority: return -1 elif self.priority == other.priority: return 0 else: return 1 if __name__ == '__main__': a=GOb("T1", 0) b=GOb("T2", 2) c=GOb("T3", 1) GOb.c_show_all() print "delete T1:" del a GOb.c_show_all() ################################################################################ any hints? Walter

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Re: zlib
by Just Jan. 31, 2004

Jan. 31, 2004

In article <mailman.1074.1075564744.12720.python-list(a)python.org>, Skip Montanaro <skip(a)pobox.com> wrote: > Dave> I am looking for a zlib implementation (or any other which can > Dave> handle zip archives) for Python 1.5.2. I only found one for Python > Dave> >= 2.2 :-( > > Assuming you have access to a C compiler, you might be able to fairly easily > backport the 2.2 version of zlibmodule.c back to 1.5.2. zlib is part of the 1.5.2 distro, but zipfile.py was new in 1.6 it seems. Just

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timeit
by Duncan Smith Jan. 31, 2004

Jan. 31, 2004

This is possibly a stupid question, but I need to get this working quickly, and I guess I'm just too tired / pressured to see what I'm doing wrong. Clearly (from the output below) I can't pass the statement to an instance of timeit.Timer, but I can execute it using exec(). Any idea what I need to do to get this timed (using timeit). Cheers. >>> import SDC_table >>> import subtract >>> import timeit >>> t = SDC_table.RandomTable(1, 12, (2,3,4)) >>> s = """\ p = subtract.p_risk(t.values, 10) """ >>> tim = timeit.Timer(stmt=s) >>> tim.timeit(10) Traceback (most recent call last): File "<pyshell#119>", line 1, in -toplevel- tim.timeit(10) File "C:\Python23\lib\timeit.py", line 158, in timeit return self.inner(it, self.timer) File "<timeit-src>", line 6, in inner NameError: global name 'subtract' is not defined # yet >>> exec(s) >>> p 0.242621453769059

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zlib
by David Dürrenmatt Jan. 31, 2004

Jan. 31, 2004

Hi, I am looking for a zlib implementation (or any other which can handle zip archives) for Python 1.5.2. I only found one for Python >= 2.2 :-( Thanks Dave -- Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

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Re: timeit
by Duncan Smith Jan. 31, 2004

Jan. 31, 2004

"Robert Brewer" <fumanchu(a)amor.org> wrote in message news:mailman.1071.1075531877.12720.python-list@python.org... Duncan Smith wrote: > >>> import SDC_table > >>> import subtract > >>> import timeit > >>> t = SDC_table.RandomTable(1, 12, (2,3,4)) > >>> s = """\ > p = subtract.p_risk(t.values, 10) > """ > >>> tim = timeit.Timer(stmt=s) > >>> tim.timeit(10) > > Traceback (most recent call last): > File "<pyshell#119>", line 1, in -toplevel- > tim.timeit(10) > File "C:\Python23\lib\timeit.py", line 158, in timeit > return self.inner(it, self.timer) > File "<timeit-src>", line 6, in inner > NameError: global name 'subtract' is not defined > > # yet > >>> exec(s) > >>> p > 0.242621453769059 I believe you need to put *any* initialization code (like "import subtract") into the "setup" parameter to Timer(). So try something like: > >>> import timeit > >>> s = """p = subtract.p_risk(t.values, 10)""" > >>> tim = timeit.Timer(stmt=s, setup="import SDC_table, subtract; t = SDC_table.RandomTable(1, 12, (2,3,4))") > >>> tim.timeit(10) That does the job. Cheers. Duncan

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Safe to modify globals(), or not?
by robert_dodier＠yahoo.com Jan. 31, 2004

Jan. 31, 2004

Hello, I'm interested in introducing new variables into the environment of a Python interpreter or program. In reading through old posts to this newsgroup, I see there is an often-repeating warning against modifying the contents of locals(). Fair enough. However, is there anything wrong with modifying globals() ? In the list of built-in functions (http://www.python.org/doc/lib/built-in-funcs.html) locals() has an explicit warning, globals() doesn't. Does that mean it's safe to modify globals() ? By the way, is there another way to introduce a new variable into a scope (local or global) other than assigning directly to the dictionary returned by locals() or globals() ? Just some context -- I want to parse strings written in a "little language" and then have new variables show up in the Python environment so the user can manipulate them. E.g., >>> parse_funky_language("Hey, this is far out, man.") >>> Hey.part_of_speech Interjection Any light you can shed on this issue will be appreciated. Thanks for not getting distracted about whether this is useful. regards, Robert Dodier -- If I have not seen as far as others, it is because giants were standing on my shoulders. -- Hal Abelson

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