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

OT: Delphi/Python
by Jeff Bauer Sept. 2, 2000

Sept. 2, 2000

Apologies for the off-topic intrusion ... If there are any Delphi/Python programmers out there, please contact me via email: jbauer(a)rubic.com -Jeff

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print without newline?
by noahspurrier＠my-deja.com Sept. 2, 2000

Sept. 2, 2000

Is there a way to print without the newline (carriage return or line feed)? This does not do what I want: print "Hello.", because it puts a space after the "Hello." So I've been doing this: sys.stdout.write ("Hello.") but this seems ugly, plus I have to import sys. Yours, Noah Sent via Deja.com http://www.deja.com/ Before you buy.

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

Sept. 2, 2000

Hi Guys, The latest entries into http://python.faqts.com cheers, Fiona Czuczman ## Unanswered Questions ######################################## ------------------------------------------------------------- How to limit the max number of simultaneous conections in a server implemented with asyncore.py http://www.faqts.com/knowledge-base/view.phtml/aid/5681 ------------------------------------------------------------- Eduardo Roldan ## New Entries ################################################# ------------------------------------------------------------- Is it possible to determine the name of the currently executing function? http://www.faqts.com/knowledge-base/view.phtml/aid/5702 ------------------------------------------------------------- Fiona Czuczman Alex Martelli Sure -- piece o' cake...: def caller(n=1): from traceback import extract_stack stack = extract_stack() return stack[-n-2][2] # Example usage: def a(): print "this is", caller(0) b() def b(): print "and this is",caller(0), print "called by",caller() Expected output by calling a(): this is a and this is b called by a ------------------------------------------------------------- What is File-like Object? http://www.faqts.com/knowledge-base/view.phtml/aid/5703 ------------------------------------------------------------- Fiona Czuczman Pete Shinners, Will Ware a file-like object is any object (including the regular file object) that has the same methods as the file object. this would typically be the .read() and/or .write() methods. The reason many modules mention they take a file-like object is to give the developer more flexibility. Instead of only taking a file object, they can take any python object with the same set of methods. Most of the time you will probably just use a regular file object. but you can also use many other objects if you want. usual suspects would be stuff like sys.stdout, stringio, and similar things (actually, sys.stdout really is a file object) hopefully that's not too confusing. if you're still not sure, just use a regular file object and don't sweat it. (not sure as to your newbie-ness, a file object is returned from the open() command) :] ------------------ It's an object that behaves like a file. That is to say, it implements the methods a file would normally have, such as read(), readline(), readlines(), write(), flush(), and so forth. You can find out more about files and their methods in the Python Tutorial at http://www.python.org/doc/current/tut/tut.html The part about files is section 7.2. ------------------------------------------------------------- Can I implement access control in my classes (equivalent to C++'s private, public, protected, etc...)? http://www.faqts.com/knowledge-base/view.phtml/aid/5705 ------------------------------------------------------------- Fiona Czuczman Alex Martelli Naming an item with two leading underscores (and without two _trailing_ underscores as well) is as close to "private" as Python comes (the compiler decorates the attribute name with the classname, so no accidental clash is possible any more). There is, AFAIK, no parallel to "protected" (nor any particular need for it; it is, after all, a feature which Stroustrup deeply regrets having let himself be talked intro introducing in C++ -- see his excellent book "Design & Evolution of the C++ Programming Language"). ------------------------------------------------------------- Is there a python script similar to shelve or pickle that will take an array and convert it to XML code? http://www.faqts.com/knowledge-base/view.phtml/aid/5706 ------------------------------------------------------------- Fiona Czuczman Michal Wallace Problem: We have several arrays, some are multidimensional arrays, created with NumPy. We'd like store these arrays in an XML data structure. Is there a python script similar to shelve or pickle that will take an array and convert it to XML code? Thanks. Solution: The xmlrpc module has routines to convert structures to XML (it's on www.pythonware.com) .. But if you want more control over what the XML looks like, you could always start with something like: def xmlify(somearray): res = "<cell>" for item in somearray: if type(item)==type([]): res = res + xmlify(item) else: res = res + item res = res + "</cell>" return res print '<?xml version="1.0"?>' print xmlify(yourMultiDimensionalArray) ------------------------------------------------------------- How can I get a file's permissions? http://www.faqts.com/knowledge-base/view.phtml/aid/5707 ------------------------------------------------------------- Fiona Czuczman Fredrik Lundh Problem: I have been able to get a file's owner and group IDs using the os.stat function but it doesn't seem to give me the file's permissions. Solution: the first member of the stat tuple (ST_MODE) contains the permissions, as a bitmask. you can use the functions and macros in the "stat" module to decipher them. st = os.stat(myfile) mode = st[stat.ST_MODE] if mode & stat.ST_IREAD: print "readable" if mode & stat.ST_IWRITE: print "writable" if mode & stat.ST_IEXEC: print "executable" Problem cont.: Thanks for your help but I only seem to be able to check whether or not the user running the script has "rwx" permissions. I am looking to find the permissions for owner/group/other, preferably in numeric mode. Solution: did you try printing the "mode" value? I'm pretty sure it does contain the "numeric mode" you're looking for. try this: st = os.stat(myfile) mode = st[stat.ST_MODE] print "mode is", octal(mode & 0777) (looking in the stat module source file may also help; it's in Python's Lib directory) ------------------------------------------------------------- Is there a simple way of displaying an error message dialog box in Tkinter? http://www.faqts.com/knowledge-base/view.phtml/aid/5708 ------------------------------------------------------------- Fiona Czuczman Yaniv, Fredrik Lundh Of-course there is: from tkMessageBox import * showerror(<title>, <message>) ----------- check out the tkMessageBox module, documented here: http://w1.132.telia.com/~u13208596/tkintrobook/standard-dialogs.htm ------------------------------------------------------------- How do I do do simple interpolation using NumPy? http://www.faqts.com/knowledge-base/view.phtml/aid/5709 ------------------------------------------------------------- Fiona Czuczman Nick Bower import arrayfns new_y = arrayfns.interp(y,x,new_x) ## Edited Entries ############################################## ------------------------------------------------------------- How to "expire" a web page with Python ? http://www.faqts.com/knowledge-base/view.phtml/aid/5664 ------------------------------------------------------------- Quynh Nguyen Anh, Fiona Czuczman Calvelo Daniel Not sure whether I understand the question, but it looks as if you want to print """<meta http-equiv="expires" content="some_date">""" at the beginning (within the <head>er) of the script generating a page. Still not sure I understand the question and/or/if it is a Python question... HTH anyway.

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Error in base64 module
by jun won, Seo Sept. 2, 2000

Sept. 2, 2000

Hi,, I have a string "xde9usauwd8" I want to base64decoding that string "xde9usauwd8". examply, In PHP3's function imap_base64() result = imap_base64("xde9usauwd8") result is "Å×œºÆ®Áß" but Python 1.5.2 import base64 result = base64.decodestring("xde9usauwd8") I meat a Error Message binascii.Error: Incorrect padding Why?.. Error in Python's base64 module?

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RE: gratuitous new features in 2.0
by Mike Fletcher Sept. 2, 2000

Sept. 2, 2000

Afraid I'm not really finding the ">>" syntax very beautiful/clear/obvious either. It's recognisable to Unix and C++ people, but it's not a particularly obvious reference for non-C++ programmers or those not accustomed to using shell redirection. Of the alternates proposed, "to" (which has problems with not currently being a keyword, and thereby introducing some potential for code breakage, but is the most intuitive word) or "in" seem the clearest. That said. I'm one of those who don't see why this needs to be a syntax-level construct, a function would seem just as useful and readable (more readable than the >> syntax, at least), and doesn't introduce the cryptic symbols of the current PEP. Enjoy yourselves, Mike -----Original Message----- From: Robin Becker [mailto:robin@jessikat.fsnet.co.uk] Sent: Friday, August 25, 2000 3:25 AM To: python-list(a)python.org Subject: Re: gratuitous new features in 2.0 ... here here, I hate the >> construct, why not print in stderr items,.... print + stderr items,....... print[stderr] items,..... print to stderr items,..... ...

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Re: Python and COBOL
by François Pinard Sept. 1, 2000

Sept. 1, 2000

[Ian Parker] > It did have interesting concepts: > (iii) The PERFORM for calling procedures once or repetitively (which I > remember as being deeply cool). Notably, you had the "PERFORM paragraph-1 THRU paragraph-2.". You never knew for sure where a subroutine started or ended, just looking at it. You had to find those PERFORM first, to understand subroutines boundaries. Even worse was "ALTER paragraph-1 TO PROCEED TO paragraph-2.", with the limitation that the first given paragraph should contain a single GOTO statement. It had the effect of altering that GOTO statement at run-time, so it jumps elsewhere than what it textually looked in the source. So, you might not even believe that a GOTO was being executed as written. I once worked in a series of programs making a notable abuse of these things, and in my opinion, that system was both unreadable and unmaintainable. COBOL was designed to be readable, but to succeed in this, any team also needed books to rule tons of conventions and verboten writings. Python is designed to be readable. The only rule is to avoid lambda's :-). P.S. - And before anyone feels hurt, remember that I'm always a bit kidding. -- François Pinard http://www.iro.umontreal.ca/~pinard

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Can anyone spot my float error?
by Richard Harvey Sept. 1, 2000

Sept. 1, 2000

I'm seeing an extrememly wacky effect in 1.5.2, and the code is so simple I'm baffled that I cannot see the error. Here is a snippet: timer = 0.0 def testFunc(): global timer timer = timer + 0.5 if timer > 10.0: print "timer > 10" If I repeatedly call testFunc in a loop, my print statement never gets called. However, if I change the code to the following everything works fine: timer = 0.0 def testFunc(): global timer timer = timer + 0.5 dummy = "timer is %s" % str(timer) if timer > 10.0: print "timer > 10" In this case, my if statement becomes true as expected. I've tried calling isinstance(timer,FloatType), and it returns true. Also, if I change the dummy line to: dummy = "timer is %f" % timer the code no longer works; dummy does not get assigned, and my if statement is never true. Arrrghh!! Rich

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Injecting methods from one object to another
by Dan Schmidt Sept. 1, 2000

Sept. 1, 2000

I want to copy method x from object foo to object bar. class Bar: def __init__(self): self.name = 'bar' def x (self): print self.name class Foo: def __init__(self): self.name = 'foo' bar = Bar() foo = Foo() Now, foo.x = bar.x doesn't work, because foo.x is still bound to bar: >>foo.x() bar I want it to be bound to foo. foo.x = bar.x foo.x.im_self = foo doesn't work, because im_self is read-only. I tried to get the actual function Bar.x and bind it to foo by hand: foo.x = bar.x.im_class.x.im_func but that didn't work either: >>foo.x() TypeError: not enough arguments; expected 1, got 0 though it's close: >>foo.x(foo) foo The only problem is that foo.x is returning a function, not a method bound to foo. I thought that if x was a function member of foo, then foo.x would automatically bind it, but it's not. I'm sure that I'm almost there and that there's a very simple solution, but I can't find it. Anyone have the answer? Thanks in advance. -- Dan Schmidt | http://www.dfan.org Honest Bob CD now available! | http://www.dfan.org/honestbob/cd.html

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snack
by Darren Young Sept. 1, 2000

Sept. 1, 2000

Where can one find some info on snack and possibly some examples on using it within python? Thanks, Darren Young

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Feedback wanted about the best way to write cgi scripts
by Alain TESIO Sept. 1, 2000

Sept. 1, 2000

Hello, I've written simple functions to input html code. You'll get the idea with the code below, this example is for static html code,it becomes really useful for me when there are more dynamic items. Do you think it's terribly ugly, should I use an existing library ? (please no flame about the first line "#! ...", it's really needed in my case !) Thanks for your feedback Alain #!/usr/bin/env /home/onesite/bin/mypython execfile('mycgi.py') print mycgi_http_header() print mycgi_head(base_target="left") dateselect=mycgi_input_select("daterange",[ \ ("last3months","Last 3 months"),\ ("lastmonth","Last month"),\ ("lastweek","Last week"),\ ("dates","Date range")\ ]) input_startdate=mycgi_input_text(name="startdate",size=9,style="text-align:center;",value="06/11/2000") input_enddate=mycgi_input_text(name="enddate",size=9,style="text-align:center;",value="06/11/2000") input_sort=mycgi_input_select("sort",[ \ ("thread","Thread"),\ ("date","Date"),\ ("author","Author")\ ]) input_submit='<input type="submit" name="idxsearch" value="Search">' formitems=["<p>Dates :",dateselect,input_startdate,input_enddate,"</p><p>Sort by :",input_sort,input_submit] form_standard=mycgi_form(items=formitems,target="left",method="post",action="left.php3") input_results_per_page=mycgi_input_select("ps",[ \ ("10","10"),\ ("20","20","selected"),\ ("50","50")\ ]) input_query_type=mycgi_input_select("m",[ \ ("and","All","selected"),\ ("or","Any")\ ]) formitems=[mycgi_input_text("q",50),mycgi_input_submit("Search"),"<br>Results per page :",input_results_per_page,"Query type :",inpu t_query_type] form_search=mycgi_form(items=formitems,method="get",action="search.php3") print mycgi_table([[{"width":362,"text":form_standard},{"width":596,"text":form_search}]]) print mycgi_end()

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