🌐 Mailman 3 August 2000 - Python-list - python.org

[JOB] Python Programmers Needed
by Bill Scherer Aug. 2, 2000

Aug. 2, 2000

Verizon Wireless is seeking to fill a few contract positions for Python coding of intranet applications. The candidiates must be able to work full time on site in Orangeburg, NY, US. Experience with Python is required. Currently, we expect the job to last 3 to 4 months, possibly more. The positions may be Right-To-Hire. Please send your resume and cover letter to: Bill.Scherer_at_VerizonWireless.com -- William K. Scherer Sr. Member of Applications Staff - Verizon Wireless Bill.Scherer_at_VerizonWireless.com

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Re: [Python-Dev] Still no new license -- but draft text available
by Jack Jansen Aug. 2, 2000

Aug. 2, 2000

I'm not sure I'm entirely happy with point 3. Depending on how you define "derivative work" and "make available" it could cause serious problems. I assume that this clause is meant so that it is clear that MacPython and PythonWin and other such versions may be based on CNRI Python but are not the same. However, if you're building a commercial application that uses Python as its implementation language this "indication of modifications" becomes rather a long list. Just imagine that a C library came with such a license ("Anyone incorporating this C library or part thereof in their application should indicate the differences between their application and this C library":-). Point 2 has the same problem to a lesser extent, the sentence starting with "Python ... is made available subject to the terms and conditions..." is fine for a product that is still clearly recognizable as Python, but would look silly if Python is just used as the implementation language. -- Jack Jansen | ++++ stop the execution of Mumia Abu-Jamal ++++ Jack.Jansen(a)oratrix.com | ++++ if you agree copy these lines to your sig ++++ www.oratrix.nl/~jack | see http://www.xs4all.nl/~tank/spg-l/sigaction.htm

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package blues
by Oivvio Polite Aug. 2, 2000

Aug. 2, 2000

Greetings. We're building this package and we're deciding which classes should go in which modules and which modules should go into which subpackages. The first intuitive approach was to try to map the class structure onto a directory/files structure (in the style of Java). This turned out to be a bad idea, simply because python is not meant to be like java. The identifiers in the imports become very long and (as module name often equals class name) utterly confusing. So I took a look at NumPy and a couple of other packages that I've installed and found out that the directory structure of these packages is very shallow. They typically cram a lot of classes and functions into every module. Having a lot of stuff in one file never feels nice. And in a collaborative project like ours it creates an other problem. If I check out one file from the our version control db, it gets locked. The larger the files the greater chances that an other programmer will need to work on the same files as me. So we looked for something resembling the include of C. A thread out here mentioned execfile(). But that doesn't seem like a very nice solution. This post turned out a bit confused, but so are the issues at hand. I think that some of you will recognize our frustration and I hope that you've found ways to deal with it. oivvio

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Win32 XML installer update 08/02/00
by Christian Tismer Aug. 2, 2000

Aug. 2, 2000

Hi Python XML users, an updated version of the win32 installer for the current XML-sig CVS tree is available at http://www.tismer.com/xml/PythonXML.EXE Please inform me if you find any glitches. ciao - chris -- Christian Tismer :^) <mailto:tismer@appliedbiometrics.com> Applied Biometrics GmbH : Have a break! Take a ride on Python's Kaunstr. 26 : *Starship* http://starship.python.net 14163 Berlin : PGP key -> http://wwwkeys.pgp.net PGP Fingerprint E182 71C7 1A9D 66E9 9D15 D3CC D4D7 93E2 1FAE F6DF where do you want to jump today? http://www.stackless.com

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hostname in smtp.helo()
by Sam Wun Aug. 2, 2000

Aug. 2, 2000

how come I can put in any invalid hostname in the smtp.helo() method call? eg. smtp.helo("rubbish") is not throwing any exception?? Thanks Sam.

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Slightly OT - Need hep beta testing Python Q's for certification
by icurhere2＠my-deja.com Aug. 2, 2000

Aug. 2, 2000

Hello, I am currently charged with developing a test in Python 1.5, and need some people to review the questions that are currently in beta. The test should be there for the next couple of days, and I would appreciate any comments about the test that could be provided. If interested, the beta test is available at the following URL: http://www.brainbench.com/testcenter/brainbench/t1.jsp?core=% 2Fbetapins.html making sure that the URL is one line. All feedback and comments will be taken into account. A beta test consists of 32 items (2 independent sets of 16) and the amount of time required varies from person to person. If anyone was any questions or comments, please E-mail me with the contact information below. Thanks, Michael Becraft mailto:michael.becraft@NOSPAMbrainbench.com Sent via Deja.com http://www.deja.com/ Before you buy.

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McMillan's Installer problem with win32com
by ryzam＠my-deja.com Aug. 2, 2000

Aug. 2, 2000

Hi, I'm getting trouble to compile with McMillan's Installer on wxPython GUI application that import win32com module. No error when running in interpreter mode like python mycoding.py. This is an example in my coding that using win32com module class ComInternetExplorer: '''An interfce to Microsoft Internet Explorer using COM. The MSIE objects can be used directly, this class just wraps some of the behaviors for convenience. jjk 09/02/99''' def __init__(self, visible=1, timeout=200, waitInterval=1): '''Initialize the receiver: opens an Internet Explorer application jjk 09/02/99''' self.ie = win32com.client.Dispatch("InternetExplorer.Application") self.ie.Visible = visible #self.ie.StatusBar=0 #self.ie.Width=400 #self.ie.Height=400 #self.ie.ToolBar=0 self.timeout = timeout # seconds before waitWhileBusy() times out self.waitInterval = waitInterval # interval (seconds) between busy tests bla bla.....continue coding here.... I get the following error when i run python Standalone.py: Traceback (innermost last): File "Builder.py", line 502, in ? main(opts,args) File "Builder.py", line 484, in main target.build() File "Builder.py", line 87, in build self.assemble() File "Builder.py", line 234, in assemble shutil.copy2(path,self.name) File "C:\Program Files\Python\Lib\shutil.py", copyfile(src,dst) File "C:\Program Files\Python\Lib\shutil.py", fsrc=open(src,'rb') IOError:[Errno 2] No such file or directory: 'c:\\windows\\system\\pywintypes.dll' Sent via Deja.com http://www.deja.com/ Before you buy.

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[FAQTS] Python Knowledge Base Update -- August 2nd, 2000
by Fiona Czuczman Aug. 2, 2000

Aug. 2, 2000

Hello All, <standard comment>Here is yet another instalment of entries into http://python.faqts.com </standard comment> - Fiona ## Unanswered Questions ######################################## ------------------------------------------------------------- How do I take an int, which represents an IP address, and convert it back to dotted quad format? (in C, it's inet_ntoa) http://www.faqts.com/knowledge-base/view.phtml/aid/5115 ------------------------------------------------------------- Jon Nelson, Fiona Czuczman ------------------------------------------------------------- The Windows distribution is set up to work with Tcl/Tk version 8.0 dlls. How do I reconfigure it to work with a later version of Tcl/Tk? http://www.faqts.com/knowledge-base/view.phtml/aid/5149 ------------------------------------------------------------- Steve Beisner ## New Entries ################################################# ------------------------------------------------------------- Does Python distinguish between double and single quotes in any way? http://www.faqts.com/knowledge-base/view.phtml/aid/5151 ------------------------------------------------------------- Fiona Czuczman John Grayson, Aahz Maruch, Erik Max Francis Single and double quotes may be freely interchanged (so long as they are balanced %-) ). It is easy, therefore, to construct strings containing either single or double quotes. "It's" 'quote "xxx"' lst = ['1', "2", '3'] is equivalent to lst = ["1", '2', "3"] If you are constructing command strings to use in Unix, then it can be very convenient. Note that you may still need to escape occasional quotes... look4 = 'file' word_count = os.popen("grep 'open(%s \"rb\")' *.py | wc" % look4) ------ In addition to all the other comments, remember that if you have quoting problems, use """ or ''' (the two triple-quotes) -- you can avoid almost all quote-quoting that way. ------ They're both interchangeable. They're used to help with quoting of the quotes themselves, viz.: '"Buk," said the duck.' "There's a duck here." Specifically, in Python the quotes are not used to determine whether variables are embedded in strings, as they are in shell scripting or Perl or some other languages; Python does not embed variables that way. ------------------------------------------------------------- Specifying a proxy server to be used for httplib? http://www.faqts.com/knowledge-base/view.phtml/aid/5152 ------------------------------------------------------------- Fiona Czuczman Amit, David Currie Problem: The Internet in our office can only be accessed through a proxy server. I wanted to write a utility in Python that uses the httplib module to automate some routine searches. But I am stuck since there does not seem to be a way to access the Internet thru' the proxy. I am sure there is a very small thing which I am missing. Could someone please advise on how to channel the request thru' proxy and automate authentication? Solution: I figured it out by reading RFC 2617 on "HTTP Authentication: Basic and Digest Access Authentication", and by a helpful post by David Currie dated 12 July, 2000. The solution - in this case - was as follows: --------------------------------------------- import httplib import base64 # 1. connect to the proxy h1 = httplib.HTTP("154.112.170.19:80") # 2. give the absolute URL in the request h1.putrequest('GET', 'http://www.yahoo.com/') h1.putheader('Accept', 'text/html') h1.putheader('Accept', 'text/plain') # 3. set the header with a base64 encoding of user-id:passwd auth = "Basic " + base64.encodestring("john_doe:glug#123") h1.putheader('Proxy-Authorization', auth) h1.endheaders() # 4. get the page errcode, errmsg, headers = h1.getreply() print errcode print errmsg print headers f=h1.getfile() for line in f.readlines(): print line --------------------------------------------- ------------------------------------------------------------- Is there a way to create variables on the fly, like in a loop? http://www.faqts.com/knowledge-base/view.phtml/aid/5153 ------------------------------------------------------------- Fiona Czuczman Michal Wallace Problem: Does anyone know of a way to create variables on the fly, like in a loop? I want to be able to build a set of check buttons in a GUI I'm writing, and each check button needs a different variable, I think, to determine which ones are checked. I want to use a for loop to iterate over a list to build the check buttons, but I don't know the contents or length of the list. Solution: The concept is called anonymous objects. In python, objects can have more than one reference pointing to them. Some of those references have names, or labels that you can see in the code. eg: >>> x = SomeClass() .. That creates a SomeClass instance and calls it "x". But you can then say: >>> y = [x] .. And now y[0] references the same SomeClass instance. if you then say: >>> x = None .. y[0] is STILL REFERENCING the original SomeClass instance. It's just "anonymous" now because it doesn't have a specific name. You could just as easily have said: >>> y = [SomeClass()] and if you want more than one: >>> y = [] >>> for x in range(10): ... y.append[SomeClass()] Here's some psuedocode that might get you thinking: >>> btnLst = [] >>> for x in range(whatever): ... newBtn = SomeButton() # just create the widget ... btnValue = SomeValue() # read from a list, maybe? ... newBtn.pack() # or whatever to get it on the screen ... list.append((newBtn,btnValue) and later on: >>> for button in btnLst: ... if button.isChecked: ... DoWhatever() ## Edited Entries ############################################## ------------------------------------------------------------- How do I print out the current time? How can I get the current date and time? http://www.faqts.com/knowledge-base/view.phtml/aid/3600 ------------------------------------------------------------- Mike Hostetler, Fiona Czuczman http://www.python.org/doc/current/lib/module-time.html,Jeff I didn't think that the official documentation was very clear on this (but it is there), so I'm adding it here. If you do >> import time >> print time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time())) You'll see something like: 2000-06-08 15:05:09 To dissect this: time.time() gets the time in seconds since the epoch time.localtime(secs) creates a tuple time.strftime(string,tuple) creates a string of the time, using the formatting in "string" (that is what the "%"'s are doing there). To see the full table of formatting options, see http://www.python.org/doc/current/lib/module-time.html Also, the system man page, ('man strftime')? documents a closer set of the formatting options actually supported by the libc, which is what the python interpreter actually calls into. this will come into play mostly on 'older' machines, but python runs on them too! ------------------------------------------------------------- Is there a quick way to see if a string is a valid date? http://www.faqts.com/knowledge-base/view.phtml/aid/3991 ------------------------------------------------------------- Fiona Czuczman richard_chamberlain Marc Lemburg's mxDateTime module (do a search at www.vex.net/parnassus) returns a RangeError if you create a date that doesn't exist. I've created a checkDate method below which returns 0 or 1. mxDateTime is an excellent module if you're going to be doing anything complicated with dates or times. import DateTime def checkDate(y,m,d): "year,month,day" try: checkDate=DateTime.DateTime(y,m,d) except DateTime.RangeError: return 0 else: return 1 def testDates(y,m,d): print '%d/%d/%d' %(y,m,d) if checkDate(y,m,d): print 'is ok' else: print 'is not valid' def main(): testDates(2000,3,10) testDates(2000,13,3) if __name__=='__main__': main() ------------------------------------------------------------- What is a tuple and why is it used (as opposed to an array, etc)? http://www.faqts.com/knowledge-base/view.phtml/aid/3795 ------------------------------------------------------------- Fiona Czuczman Stephen Hansen, Aahz Maruch, Warren Postma,Russell E Owen A Tuple is of a fixed length, the length it was when it was created. A list is of a dynamic length -- its actual size, I believe, from a memory-ish standpoint, that lists are actually larger then they appear to be in the Python environment. On the C level, my understanding from reading various posts is that the list allocates additinoal memory for elements which may be added in later, so that it doesn't have to allocate One Piece Of Memory every time an element is added. A Tuple is immutable. Once created, with its given values, it can not be changed. a = (1,2,3) can not have a[1] = 5 done. A list is mutable. You can change the individual elements at any time. My unknowing guess? The overhead to create the truly 'dynamic' lists is completely wasted in enough circumstances that it warrented making an array which was fixed, in both size, and content. ---------- >From my POV, the primary purpose of tuples is for dictionaries: they allow you to do things like foo = {} foo[(1,2)] = 3 This essentially permits the use of multi-column primary keys (to use database terminology). In addition, as Stephen Hansen pointed out, tuples are a fair bit more efficient than lists. --------- I first came across the term tuple in relation to Relational Algebra and in particular, in the realm of SQL and Databases. A row of data in a database is often called a tuple. Really, it's a way of creating a Structure like you would do in C, very efficiently, which once created, is immutable. This means you can create a hash on it, and then use the hash to get the piece of data out of a database table. This is exactly how Tuples work, and they are hashed and then placed into an associative array (Python calls associative arrays Dictionaries). So whereas there is one native Array type in C, the List type in Python is a mutable dynamically sized array, and a Tuple is a fixed immutable grouping of items, and a Dictionary is like an array where the key doesn't have to be a number. So, three kinds of things which have something in common with a C array is better than just having a return to the Bad Old Days where C arrays were fixed in size, mutable to the point that you could easily crash your system, and totally non-polymorphic. ----------- Tuples are immutable only at the highest level (the level of a shallow copy). The entries in a tuple cannot be added or removed, but if an entry is a mutable object, that object is still mutable and hence the tuple is mutable. I suspect the main reason for the existence of tuples is for use as dictionary keys. In this situation it is important to use a truly immutable tuple (one containing only immutable entries). I'm not sure how much protection Python offers, but if you do succeed in using a mutable tuple as a dictionary key, and the tuple changes, the key will no longer point to the entry. tuples appear to be basically a "const" form of lists. If Python had "const" (from C++) then it probably would not need tuples.

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Embedding in JPython
by Steffen Ries Aug. 2, 2000

Aug. 2, 2000

Hi, just a simple question: I'm trying to embed a script into a Java application. The script defines a function, which is called when certain events happen. The function is supposed to take a Java object, analyze it and return a value. Is there a way to call a python function directly? For now I have implemented: interp.set("java_obj", javaObj); interp.exec("foo(java_obj)"); which looks rather in-elegant. tia, /steffen -- steffen.ries(a)sympatico.ca <> Gravity is a myth -- the Earth sucks!

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python implemenation of rotor?
by Bill Scherer Aug. 2, 2000

Aug. 2, 2000

Hello, Does anyone know of a 'Pure Python' implementation of the rotor module? I would like to use rotor with JPython. Thanks! -- William K. Scherer Sr. Member of Applications Staff - Verizon Wireless Bill.Scherer_at_VerizonWireless.com

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