🌐 Mailman 3 September 2007 - 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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Python in Process Control?
by Wolfgang Keller March 24, 2014

March 24, 2014

Hello, is it that my know-how to use Google is insufficient or... ...does really noone use Python for industrial control applications? At least I didn't manage to find any publicly available modules for such things as OPC/fieldbus communication etc... TIA, best regards, Wolfgang Keller

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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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Writing an OPC client with Python ?
by pierlau March 24, 2014

March 24, 2014

Hello, I use an OPC server for connection to DC Drive. I would like to write a small OPC client. I have the dll OPCDAAuto.dll which contains all class and method but I wonder if its possible to instance in python the class that are in the dll ? Thanks for your help . Pierre

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newbie - Does IDLE care about sitecustomize.py?
by bobueland＠yahoo.com March 22, 2014

March 22, 2014

I have the following test script in the file customize.py # C:\Python24\Lib\site-packages\sitecustomize.py print "test text from sitecustomize" If start Python from command prompt I get C:\Python24>python test in sitecustomize Python 2.4.1 (#65, Mar 30 2005, 09:13:57) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. which shows that sitecustomize.py works Now if I start IDLE I only get IDLE 1.1.1 >>> which shows that that IDLE doesn't care about sitecustomize.py Am I missing something or how do you customize if you are using IDLE?

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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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Re: Proposal: [... for ... while cond(x)]
by Eighty Sept. 26, 2013

Sept. 26, 2013

Terry Reedy wrote: > whereas the analogous expansion of your proposal > > for x in xs: > while cond(x): > yield e(x) > > is an infinite loop and not at all what you mean. You're right. The syntax is ambiguous. I agree it's not a good idea, now. :) > x for x in xs while cond(x) if blah(x) > x for x in xs if blah(x) while cond(x) > x*y for x in xs while cond(x) for y in ys These wouldn't be a problem. "... for x in xs while cond(x) ..." would be transformed into "... for x in takewhile(cond, xs) ..." which could be applied to an if thingy if you first transform "... for x in xs if cond(x) ..." into "... for x in filter(cond, xs) ...".

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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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