🌐 Mailman 3 March 2005 - Python-list - python.org

Re: More decorator rumination
by Scott David Daniels March 30, 2005

March 30, 2005

Jack Diederich wrote: > On Wed, Mar 30, 2005 at 02:48:51PM -0800, Scott David Daniels wrote: >>In particular, I thought about something like: >> >> @mousexy >> def OnRightClick(self, x, y): >> ... >> >>so all event-responding methods tend to look like: >> >> def OnRightClick(self, event): >> x = event.GetX() >> y = event.GetY() >> > > It might be plainer (and certainly more backwards compatible) to > wrap the function when setting the event handler. > > EVT_BUTTON(self.frame, XRCID("ButtonName"), mousexy(self.OnRightClick)) > > As a matter of style & clairty, it just depends. I think this is probably the right approach. > If this is for education ... I came here because it seemed to be drifting off-topic for education. Thanks for the feedback. -Scott David Daniels Scott.Daniels(a)Acm.Org

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property and virtuality
by Laszlo Zsolt Nagy March 30, 2005

March 30, 2005

My problem is about properties and the virtuality of the methods. I would like to create a property whose get and set methods are virtual. I had the same problems in Delphi before and the solution was the same. I created a private _get method and a public get method. The former one will call the latter. The same stands for _set and set. Here is an example below: class C1(object): def namechanged(self): """Called after the name of the component has been changed.""" pass def getname(self): """Returns the name of the component. You can override this method to provide generated component names.""" return self._name def setname(self,name): """Set the name of the component. You can override this method to programatically control component name changes. """ self._name = name self.namechanged() def _getname(self): """Internal method, do not use""" return self.getname() def _setname(self,name): """Internal method, do not use""" self.setname(name) name = property(_getname,_setname,"Name") class C2(C1): def getname(self): return "lala" class C3(C1): def _getname(self): return "lala" name = property(_getname,None,"Name") c1 = C1() c2 = C2() c3 = C3() c1.name = 'Test1' c2.name = 'Test2' c3.name = 'Test3' print c1.name # This will print 'Test1' print c2.name # This will print 'lala' print c3.name # This will print 'lala' print C3.name is C1.name # False I cannot override C2._getname instead, because c2.name would print 'Test2" instead of lala. Clearly, the property stores a reference to the get and set methods and it is not possible to have it use the new methods. Creating a new property is the worst - need to duplicate code and also C3.name is C1.name returns False. :-) It is not a big problem because I found the solution just I wonder if there is a better way to "virtualize" property get/set functions. -- _________________________________________________________________ Laszlo Nagy web: http://designasign.biz IT Consultant mail: gandalf(a)geochemsource.com Python forever!

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initialize a dictionary
by shama.bell＠gmail.com March 30, 2005

March 30, 2005

Hello, Can I do something like this? table = {} table[32, 16] = 0x0 Where 32 specifies rows and 16 specifies columns and i am trying to initialize it to zero I should be able to do comparisons like: table[t1, t2] == 0x1 etc. -SB

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Suggesting methods with similar names
by bearophileHUGS＠lycos.com March 30, 2005

March 30, 2005

I have a class Surface with many methods. Working in the interactive window I receive an error like this when I write the wrong method name: >>> table.addGlas() Traceback (most recent call last): File "<stdin>", line 1, in ? AttributeError: 'Surface' object has no attribute 'addGlas' Is it possibile to make the object give a better answer: a short list of few method names similar to the one I've misspelled? I've found some modules with phonetic algorithms like soundex, metaphone, etc, for example here: http://sourceforge.net/projects/advas/ I can produce the list of method names with this: toRemove = """__delattr__ __dict__ __getattribute__ __module__ __new__ __reduce__ __copy__ __reduce_ex__ __setattr__ __slot__ __weakref__ __str__ __class__ __doc__""".split() methods = sorted( set(dir(Surface)).difference(toRemove) ) The problem is calling the phonetic algorithm to show a ranked list of the 2-4 method names most similar to the wrong one called. I don't know if this problem requires a change in the python shell, or in the metaclass of that Surface class, etc. And in the end maybe this functionality (inspired by a similar Mathematica one) is already inside IPython :-] Bye, Bearophile

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pySerial- need help.
by kamarudin samsudin March 30, 2005

March 30, 2005

Hi all, I try to invoke python serial script via my browser using PHP (exec function). For the serial communication, i used pySerial module. It fine when it run it as root but when i try to run it from browser, i got this error in my httpd/error_log File "weather1.py", line 9, in ? ser=serial.Serial('/dev/ttyS0',9600,timeout=1) File "/usr/lib/python2.3/site-packages/serial/serialutil.py", line 153, in __init__ self.open() File "/usr/lib/python2.3/site-packages/serial/serialposix.py", line 137, in open raise SerialException("Could not open port: %s" % msg) serial.serialutil.SerialException: Could not open port: [Errno 13] Permission denied: '/dev/ttyS0' i tried chmod go+wr /dev/ttyS0 but i still got the error. BTW, i used apache 2.0.52, PHP 4.3.10 and Fedora Core 3 Thanks in advance. -- regards, kamarudin samsudin

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Re: [maintenance doc updates]
by Do Re Mi chel La Si Do March 30, 2005

March 30, 2005

Hi ! Thanks. But, for previous versions of Python, I downloaded a CHM version; and, at http://docs.python.org/download.html, I don't found this format. is this a lapse of memory? Would it be possible to have a continuity in the availability of the formats? Thanks again. Michel Claveau

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Re: itertools to iter transition (WAS: Pre-PEP: Dictionary accumulator methods)
by Steven Bethard March 30, 2005

March 30, 2005

Terry Reedy wrote: >>But if classmethods are intended to provide alternate constructors > > But I do not remember that being given as a reason for classmethod(). But > I am not sure what was. Well I haven't searched thoroughly, but I know one place that it's referenced is in descrintro[1]: "Factoid: __new__ is a static method, not a class method. I initially thought it would have to be a class method, and that's why I added the classmethod primitive. Unfortunately, with class methods, upcalls don't work right in this case, so I had to make it a static method with an explicit class as its first argument. Ironically, there are now no known uses for class methods in the Python distribution (other than in the test suite). However, class methods are still useful in other places, for example, to program inheritable alternate constructors." Not sure if this is the only reason though, and even if it is, it might not be entirely applicable because while the itertools functions may be supplying alternate constructors, it's not clear why anyone would subclass iter[2], so the constructors aren't likely to be inherited. STeVe [1] http://www.python.org/2.2.3/descrintro.html#__new__ [2] That is, in the simple case, where iter is still basically a factory function, not a type wrapper.

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Re: Using something other than ';' to separate statements
by Michael Hoffman March 30, 2005

March 30, 2005

Jaime Wyant wrote: > # This won't work > if a > 5: print "a > 5";else print "Doh" This will: ["Doh", "a > 5"][a > 5] I highly discourage using it though--it's somewhat obtuse. -- Michael Hoffman

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[ANN]: Last Chance 2005 IORCC Entries
by iorcc＠yahoo.com March 30, 2005

March 30, 2005

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Problem in designing a global directory in python
by Tian March 30, 2005

March 30, 2005

I want to create a object directory called Context in my program, which is based on a dict to save and retrieve values/objects by string-type name. I have the definition like this: utils.py -------------------- global sysctx class Context: def __init__(self): def set(self, name, obj, overwrite=True): def get(self, name): def has(self, name): def init(): global sysctx sysctx = Context() def getContext(): global sysctx return sysctx --------------------- init() is called somewhere at the beginning of the program. In other modules, i want to use this in the following manner, from utils import * getContext().set(...) but SOMETIMES I met following error located in "getContext()" NameError: global name 'sysctx' is not defined I found that when a module is in the same directory as utils.py, when I can simply use "utils" for importing, there is no such problem. But when i was writing a module in a deeper directory than utils.py, which has to use the full module name for importing, such as: from myproj.utils import * getContext().set(...) I got this error. What should I do to correct that?

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