473,573 Members | 2,744 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Unicode troubles

Hi!
I'm finishing a multiplatform collaborative realtime text editor (something
like SubEthaEdit but multiplatform and opensource) develloped using
Python+Twisted as a plugin for Leo.

Of course as the software run in different platforms in different places,
text encoding compatibility is an issue.
So the obvious choice was Tkencoding for client gui, unicode for system
internals and utf-8 for web outputs.
But I'm getting serious trouble using Tk and Unicode internals.

The system, being a text editor use string lenghts and position in the text
widget as parameters of most of the function critical algorithms.
Unfortunatelly I had discovered recently that some encoding does not provide
and equivalence between
num_of_chars/length_of_strin g/position_in_tex t_widget. As a result each time
someone press a non ascii key, the references are lose and the other clients
receive a soup of letters.

I had read on internet that Unicode was supposed to keep the relation
num_of_char/string_lenght (and thus the relation
string_length/num_of_char/position_in_tex t_widget). But this relation does
not occurs on all my machines.

Sometimes I get len(u"el") = 3 (the good result) and other times
len(u"el") = 4 (wrong result). These seems indiferent of the OS.

Could someone explain me this issue ? How I'm supposed to manage this
problem ? Do I have to compile python with special params to get unicode
chars and one length unit ?

Thanks.
Rodrigo Benenson.
Jul 18 '05 #1
1 1675
Rodrigo Benenson wrote:
Sometimes I get len(u"el") = 3 (the good result) and other times
len(u"el") = 4 (wrong result). These seems indiferent of the OS.


There are different ways to express "special" characters.
E.g. you can describe "" as a single character,
or as accent + "o".
What you want is the "canonical form".
Take a look at unicodedata.nor malize (well, it came
new with Python 2.3)

http://www.python.org/doc/current/li...icodedata.html

Hope this helps,

Michael Radziej

Jul 18 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
376
by: Rodrigo Benenson | last post by:
Hi! I'm finishing a multiplatform collaborative realtime text editor (something like SubEthaEdit but multiplatform and opensource) develloped using Python+Twisted as a plugin for Leo. Of course as the software run in different platforms in different places, text encoding compatibility is an issue. So the obvious choice was Tkencoding for...
0
1283
by: Irmen de Jong | last post by:
Hello I'm having some troubles with PySqlite (0.4.3, windows/linux). I want to store unicode strings in the database. So I open a connection with the client_encoding="UTF-8" parameter. When I store a unicode string in a table, it seems to work fine. (a sqlite .dump shows that it encoded the unicode string to UTF-8). But the problem is...
8
5259
by: Bill Eldridge | last post by:
I'm trying to grab a document off the Web and toss it into a MySQL database, but I keep running into the various encoding problems with Unicode (that aren't a problem for me with GB2312, BIG 5, etc.) What I'd like is something as simple as: CREATE TABLE junk (junklet VARCHAR(2500) CHARACTER SET UTF8)); import MySQLdb, re,urllib
4
6051
by: webdev | last post by:
lo all, some of the questions i'll ask below have most certainly been discussed already, i just hope someone's kind enough to answer them again to help me out.. so i started a python 2.3 script that grabs some web pages from the web, regex parse the data and stores it localy to xml file for further use.. at first i had no problem using...
2
2614
by: Neil Schemenauer | last post by:
python-dev@python.org.] The PEP has been rewritten based on a suggestion by Guido to change str() rather than adding a new built-in function. Based on my testing, I believe the idea is feasible. It would be helpful if people could test the patched Python with their own applications and report any incompatibilities. PEP: 349
1
3068
by: shorti | last post by:
Hello, I am running DB2 UDB 8.2 on AIX 5.3. I am running some tests on converting several tables on an existing database to Unicode. The database will not be converted to unicode...just this table set. I have successfully set this up and ran some tests using Japanese characters. The test seemed to work fine. We found during our test...
9
15725
by: thijs.braem | last post by:
Hi everyone, I'm having quite some troubles trying to convert Unicode to String (for use in psycopg, which apparently doesn't know how to cope with unicode strings). The error I keep having is something like this: ERREUR: Squence d'octets invalide pour le codage UTF8 : 0xe02063 (sorry, locale is french, it means "byte sequence...
11
4266
by: John Nagle | last post by:
I passed a dict for the "env" variable to Popen with Unicode strings for the dictionary values. Got: File "D:\Python24\lib\subprocess.py", line 706, in _execute_child TypeError: environment can only contain strings It turns out that the strings in the "env" parameter have to be ASCII, not Unicode, even though Windows fully supports...
6
3887
by: gita ziabari | last post by:
Hello All, The following code does not work for unicode characters: keyword = dict() kw = '' keyword.setdefault(key, ).append (kw) It works fine for inserting ASCII character. Any suggestion?
0
7705
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language...
0
8033
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. ...
0
8206
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
1
7796
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
0
8077
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
1
5601
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupr who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes...
0
5294
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert...
0
3734
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
1
2224
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.