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

Re: print to screen and file with one print statement
by mmueller＠dgfz.de Aug. 27, 2014

Aug. 27, 2014

"Mark McEahern" <marklists(a)mceahern.com> wrote in message news:<mailman.1045085143.24238.python-list(a)python.org>... > Same basic idea: > > #!/usr/bin/env python > > import sys > > class MyWriter: > > def __init__(self, stdout, filename): > self.stdout = stdout > self.logfile = file(filename, 'a') > > def write(self, text): > self.stdout.write(text) > self.logfile.write(text) > > def close(self): > self.stdout.close() > self.logfile.close() > > writer = MyWriter(sys.stdout, 'log.txt') > sys.stdout = writer > > print 'test' > Hi Mark, works perfect. Just had to change ´file´ to ´open´ for my Python 2.1. Adding the method ´flush(self)´ to Writer helped to get my ´sys.stdout.flush()´ to work. Thanks also to two inches (previous post). Mike

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OPC for Python ?? (Win32)
by Armin Steinhoff March 24, 2014

March 24, 2014

Hi All, is there an implementation of OPC for Win32 Python available ?? ( http://www.opcfoundation.org ) Regards Armin

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Python OPC -wrapper for data collection, anyone seen it ?
by pekka niiranen March 24, 2014

March 24, 2014

Has anybody seen OPC -wrapper done in python ? In industry OPC -servers are breaking thru. It is a microsoft based technoloqy to gather process information. Many Control System manufacturers have their own OPC -servers. There exists a visual basic wrapper -library so that one write VB - programs to enquire data from OPC -server.Wrapper done to python would be cool. Mark Hammond was not interested, but I am not giving up yet... -pekka-

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Editor for Python
by MANUEL FERNANDEZ PEREZ Jan. 9, 2014

Jan. 9, 2014

Hello, I'm looking for an editor for Python.I' m interested it works on Windows.Can anybody help me? Thank you Manuel

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Sine wave?
by EC Nov. 25, 2013

Nov. 25, 2013

Ive been banging my head against the wall for the past few days trying to generate a sine wave... My math skills arent the best, I'll admit, and I think I'm going crosseyed trying to understand this... I *think* the following code should work but it outputs some really weird stuff. I'm sorta new so please help if you can! Thank you Eric #------------------------------------------- import math import wave import string pi = math.pi sin = math.sin cos = math.cos #init output and related vars sr = 44100 Outfile = wave.open("outfile.wav", "w") Outfile.setnchannels(1) Outfile.setsampwidth(4) Outfile.setframerate(sr) Outfile.setcomptype("NONE", "Uncompressed") Outtemp = [] Outstr = "" def get_phase(curphs, freq): phinc = (freq*1.0000/sr*1.0000)*360 phase = curphs + phinc if phase >= 360: phase -= 360 elif phase < 0: phase += 360 return phase def gen_wav(sec, freq, ampcent): numsamp = sec*sr amp = (ampcent*1.0000/100)*32767 i = 0 temp = [] t = 0 curphase = 0 while i < numsamp: curphase = get_phase(curphase, freq) t = int(round(amp*sin(2*pi*curphase))) temp.append(t) i+=1 return temp Outtemp = gen_wav(.01, 440, 75) Outstr = string.join(map(str, Outtemp), ",") print Outstr Outfile.writeframes(Outstr) Outfile.close()

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mutlifile inheritance problem
by maurelius01＠hotmail.com Sept. 21, 2013

Sept. 21, 2013

I have classes defined in different files and would like to inherit from a class in file A.py for a class in file B.py but am running into problems. I'm using Python 1.5.2 on Windows NT Here's a specific example: ************************ file cbase01.py: class CBase: def __init__(self): self.cclass = None print "cbase" class CImStream(CBase): def __init(self): CBase.__init__(self) print "CImStream" ************************* in file wrappers_A01.py: import cbase01 reload(cbase01) class ImStream_SavedBitmaps(cbase01.CImStream): def __init__(self): cbase.CImStream.__init__(self) print "SavedBitmaps" ************************** in file sequencer01.py import cbase01 # the offending lines, program works reload(cbase01) # if I comment these out. class Sequencer: def Append(self, item): pass ***************************** in test02.py import wrappers_A01 reload(wrappers_A01) import sequencer01 reload(sequencer01) x0 = wrappers_A01.ImStream_SavedBitmaps() *************************************************************** If I run test02 I get the traceback Traceback (innermost last): File "<string>", line 1, in ? File "D:\PythonCode\pna\eyeTracking\tests\test02.py", line 15, in ? x0 = wrappers_A01.ImStream_SavedBitmaps() File "D:\PythonCode\pna\eyeTracking\tests\wrappers_A01.py", line 21, in __init__ cbase.CImStream.__init__(self) TypeError: unbound method must be called with class instance 1st argument Any ideas what I am doing wrong? Thanks, Marc

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Best Python book(s) for a pre-teen?
by snarflemike＠yahoo.com Aug. 1, 2013

Aug. 1, 2013

Hi all, My son is 11 and wants to try programming, partly because it's what I do for a living. Even though I don't (yet?) use or even know Python, through some unexplainable thought process I've decided it would be a good language to start him off with. I've downloaded 2.2.2 and played around with it for a bit, and I would now like to hand him a book (with my guidance as needed) and say "go have fun!" Is there a book that would be suitable for this approach (again, assuming I'm around to help out as needed)? One other question -- I'd like him to be able to do simple graphics fairly early, since I think it makes the whole self-learning process much more interesting. I'm talking about things like points, lines, circles, fills, etc. Is there a binding to the Win32 graphics primatives in 2.2.2, or can I find one someplace? If this is a RTFM question, any pointers to TFM chapter, etc would be appreciated! Thanks for any guidance. I'm sure I'll end up having at least as much fun as he does. Mike

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Weirdness with python and stdin redirection under Win32
by Jonathan M. Gilligan Jan. 18, 2013

Jan. 18, 2013

I am getting an error reading stdin only when I invoke a python script by typing "bar | foo.py" or "foo.py < bar", but not when typing "bar | python foo.py" or "python foo.py < bar". The error arises ecause when input is redirected, stdin has fileno = -1 if the script is invoked as "foo.py", but correctly has fileno = 0 if it is invoked as "python foo.py" Consider the following script, which I want to use as a prototype for a simple stdin --> stdout filter: # foo.py import sys print "fileno = ", sys.stdin.fileno() lines = sys.stdin.xreadlines() for line in lines: sys.stdout.write(line) On win32 (Win2k pro, SP3), using ActiveState ActivePython 2.2.1 build 222, I can execute foo.py either by typing "foo.py" or "python foo.py" on the command line (the relevant registry key for opening .py files has command 'C:\Python22\python.exe "%1" %*'). If I type "echo bar | foo.py", I get C:\>echo bar | foo.py The process tried to write to a nonexistent pipe. fileno = -1 Traceback (most recent call last): File "C:\foo.py", line 7, in ? lines = sys.stdin.readlines() IOError: [Errno 9] Bad file descriptor whereas if I type "echo bar | python foo.py", I get C:\>echo bar | python foo.py fileno = 0 bar Other tests yield: C:\>foo.py < foo.py fileno = -1 Traceback (most recent call last): File "C:\Documents and Settings\Jonathan\My Documents\Programming\Omap VU\Fast CameraDriver\BF_LabView\Leo\foo.py", line 7, in ? for line in lines: IOError: [Errno 9] Bad file descriptor C:\>python foo.py < foo.py fileno = 0 # foo.py import sys print "fileno = ", sys.stdin.fileno() lines = sys.stdin.xreadlines() for line in lines: sys.stdout.write(line) If I just type "foo.py" or "python foo.py" on the command line, I get "fileno = 0" in both cases and the script works identically in both cases. Can anyone explain what's happening? Why the file descriptor for redirected stdin has a fileno of -1 if the python script is invoked using "foo.py" but not when it's invoked with "python foo.py"? Thanks, Jonathan

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PyXML 0.8.2 is released
by martin＠v.loewis.de July 17, 2012

July 17, 2012

Version 0.8.2 of the Python/XML distribution is now available. It should be considered a beta release, and can be downloaded from the following URLs: http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.2.tar.gz http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.2.win32-py2.2.exe http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.2-2.2.Suse81.i386.rpm Changes in this version, compared to 0.8.1: * Updated to Expat 1.95.6. * Support more DOM L3 features in minidom: isWhitespaceInElementContent, schemaType, isId, DOMImplementationSource * Various bug fixes, including - 609641: minidom nodes not pickleable - 618156: Use character references in XMLGenerator if necessary - 622286: marshal.wddx: 'recordset' element typo - 624420: Can't create 2nd Sax2.Reader - 665486: Implement SAX skippedEntity for Expat The Python/XML distribution contains the basic tools required for processing XML data using the Python programming language, assembled into one easy-to-install package. The distribution includes parsers and standard interfaces such as SAX and DOM, along with various other useful modules. The package currently contains: * XML parsers: Pyexpat (Jack Jansen), xmlproc (Lars Marius Garshol), sgmlop (Fredrik Lundh). * SAX interface (Lars Marius Garshol) * minidom DOM implementation (Paul Prescod, others) * 4DOM and 4XPath from Fourthought (Uche Ogbuji, Mike Olson) * Schema implementations: TREX (James Tauber) * Various utility modules and functions (various people) * Documentation and example programs (various people) The code is being developed bazaar-style by contributors from the Python XML Special Interest Group, so please send comments and questions to <xml-sig(a)python.org>. Bug reports may be filed on SourceForge: http://sourceforge.net/tracker/index.php?group_id=6473&atid=106473 For more information about Python and XML, see: http://www.python.org/topics/xml/ -- Martin v. Löwis http://www.informatik.hu-berlin.de/~loewis

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AIX installation can't find zlib
by Larry Whitley Nov. 3, 2011

Nov. 3, 2011

I've just installed the 1.5.2 source distribution on an AIX system and when I say "import zlib" it responds: >>> import zlib Traceback (innermost last): File "<stdin>", line 1, in ? ImportError: No module named zlib >>> I'm not sure where zlib is supposed to be. It's not in the Lib subdirectory of Python-1.5.2. In the Modules subdirectory I find zlibmodule.c. Nothing germaine in the Objects subdirectory. Looked at config.log and config.status, no mention of zlib. Looking at the sys.path I see: .../ldw/Python-1.5.2> python Python 1.5.2 (#1, Jul 26 2000, 14:21:56) [C] on aix4 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>> import sys >>> sys.path ['', '/.../rchland.ibm.com/fs/u1/ldw/Projects/Programs/wtCache', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/plat-aix4', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/lib-tk', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Modules'] >>> Any suggestions? Larry

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