Re: Thoughts on using isinstance
On Jan 24, 3:38 pm, abcd [EMAIL PROTECTED] wrote: In my code I am debating whether or not to validate the types of data being passed to my functions. For example def sayHello(self, name): if not name: rasie name can't be null if not isinstance(name, str): raise name must be a string print Hello + name Is the use of isinstance a bad way of doing things? is it a heavy operation? for example, if I use this in each function validate input will it slow things down a lot? just curious how you might handle this type of situation (other than not validating at all). thanks My opinion is that validation is generally good. However, you have to make it not too strict. For example, instead of print Hello + name you could have written print Hello + str(name) In this case requirement isinstance() will be too strict. The only thing you have to check is that hasattr(name, __str__) and callable(name.__str__) In this case you can have validation, while at the same time enjoy full flexibility of dynamic typing. -- Maxim -- http://mail.python.org/mailman/listinfo/python-list
lxml namespaces problem
Hi All! I have a little problem with XML namespaces. In my application I have two XML processors, that process the same document, one after the other. The first one looks for nodes in 'ns1' namespace, and substitutes them, according to some algorithm. After this processor is finished, it is guaranteed that there are no more 'ns1' nodes left in the tree. however 'ns1' namespace dclaration is still there, in the root node (well, I put it there manually). Now, when this namespace is no longer needed, I want to get rid of it, because it confuses some other processors (namely, my browser) So, the question is, how do I do that? del tree.getroot().nsmap['ns1'] does not seem to do the trick :( Thanks in advance and Happy Holidays! -- http://mail.python.org/mailman/listinfo/python-list
Re: Mod_python
Lad wrote: In my web application I use Apache and mod_python. I allow users to upload huge files( via HTTP FORM , using POST method) I would like to store the file directly on a hard disk and not to upload the WHOLE huge file into server's memory first. Can anyone suggest a solution? The only solution you need is Apache and mod_python :) I mean, Apache won't load a huge POST request into its memory no matter what. All file uploads will be stored in temporary files. Under mod_python (provided you use FieldStorage) you'll need to deal only with 'file' objects. -- Maxim Sloyko -- http://mail.python.org/mailman/listinfo/python-list
Re: your opinion about psycopg vs pygresql
Martin P. Hellwig wrote: However, given the choice, what in your opinion would be the reason why someone would chose one over the other? Now I know this could easily get into a flamewar, so if you comment (but please do so) I'll still investigate that, since at this moment I don't even have a clue how they differ and on what reason, why does PostgreSQL seem to favour pygresql and Pythoneers psycopg? Thanks in advance. Well, my info can be a little out of date, since I researched this problem more than a year ago. AFAIK, psycopg still lacks prepared statements, which can be a huge drawback (partial workaround: use executemany() whenever possible). Psycopg 2 (as opposed to psycopg 1.1) does not support commit() on cursor (no serialized connections) Among the advantages of psycopg 2 is its very good support of mappings between Python data types and PostgreSQL data types. You can easily introduce your own mappings, even for composite data types. My $0.02 -- http://mail.python.org/mailman/listinfo/python-list
Re: apache mod_python
m.banaouas wrote: Can i install and use Apache 2.2.3 mod_python 3.2.10 (most recent versions) without facing any known major issue ? Works fine for me. The only known major issue you can face is general non-threadsafety of Python interpreter. So, if you are using Apache MPM, you have to allow for it, or use framework that does it for you. -- http://mail.python.org/mailman/listinfo/python-list
Re: Javascript is turning into Python?!
Paul Rubin wrote: [Correction of earlier accidental crosspost] I hadn't seen this before. New Javascript 1.7 features: - Generators - Iterators - Array comprehensions - Destructuring assignment Sounds like another language we know. http://developer.mozilla.org/en/docs/New_in_JavaScript_1.7 If you're talking about Mozilla Javascript, then most certanly yes. Mozilla team even plan to support Python in XUL. If you're talking about some standard (ECMAscript), then, well I haven't seen any progress there. -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to get data into a new instance?
tobiah wrote: [snip] class Employee: __init__(self, id): self.id = id e = Employee(32445) ... later e.firstname = 'foo' e.lastname = 'bar' ... more as the information comes about. Personally, I think that this is not a good solution. How would the reader of your code guess what properties your object has? If you don't like to write too many assignments, you can at least do something like this: def __init__(self, id, **kw): self.id = id for name in ['first_name', 'last_name', 'age', 'salary', 'whatever']: self.__dict__[name] = kw.get(name, None) -- Maxim Sloyko -- http://mail.python.org/mailman/listinfo/python-list
Re: Minidom XML output - attributes in wrong order ?
So it seems the dom module sorts the attributes alphabetically. Is there any way I can prevent it from doing that ? What I want is to list them out in the same order as they are added in the code... I don't know how to do what you ask, I'm just here to warn you that you shouldn't rely on the order of attributes in the document in any way, because this is implementation dependent. If you need to preserve order of some items -- use child elements instead of attributes. -- Regards, Maxim Sloyko -- http://mail.python.org/mailman/listinfo/python-list
psycopg2 features
Hello, clp and all people reading it! Recently I was porting my (small) app from psycopg to psycopg2 (they got me with this 2). I read, that psycopg2 supports all features of psycopg and plus many more, however, when I started to port, I discovered, that psycopg2 lacks serialized connections and commit on cursor completely. Did I miss something or psycopg2 just isn't mature enough yet? BTW, is there any postgresql engine, that can fake nested transactions via savepoints feature? -- http://mail.python.org/mailman/listinfo/python-list
Re: What do you want in a new web framework?
Laurent Pointal wrote: Look at http://wiki.python.org/moin/WebFrameworks Do you *really* need to develop a *new* framework (maybe a scholl exercise - it that case, KISS)? Isn't the main reason why there are so many of them is that all of them suck badly? -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to handle exceptions with try/finally
I guess the following standard method will help : class MyLocker(object): def __init__(self, lock): self.lock = lock self.lock.acquire() def __del__(self): self.lock.release() Then whenever you need to acquire a lock: templock = MyLocker(self.__mutex) del templock # will release the lock (provided you didn't create an extra link to this object) -- http://mail.python.org/mailman/listinfo/python-list
Re: ZSI usage
There is a typo there in functions name. It is called session_open not open_session, but everything else is as described -- http://mail.python.org/mailman/listinfo/python-list
ZSI usage
Hi all!
I'm trying to make a simple SOAP call from python to SOAP::Lite (perl)
SOAP server.
My SOAP server has https://myserv.com/open-api URI, the function
open_session has the QW/API namespace. SO I do the following:
from ZSI.client import Binding
fp = open('debug.out', 'a')
client = Binding(url='/open-api',
host='myserv.com',
port=443,
ssl=1, tracefile=fp)
client.SetNS(QW/API)
sid = client.open_session(1)
However, I get the following error:
ZSI.FaultException: SOAPAction shall match 'uri#method' if present (got
'', expected 'QW/API#open_session'
If I look at SOAP packet I see the following:
[snip]
session_open
Eo8138f18 xsi:type=xsd:integer1/Eo8138f18
/session_open
[snip]
SO the question is, why ZSI seem to ignore that NS setting? How to fix
that?
Thanks in advance!
--
Maxim
--
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