Batok

A brief guide to using virtualenv with wxpython

2010-07-21T21:12:00.002-05:00

If you are developing wxpython applications may be you can find ...

Brief Guide to using virtualenv with wxpython

useful.

Albeit it's specific for python 2.7 and Mac OS X, some ideas can be used for other platforms and versions.

Available at github here

Just a test of syntaxhighlighter in blogger

2009-02-27T19:08:00.002-06:00

This is just a test of syntaxhighlighter.


from couchdb.schema import Document, View, IntegerField, TextField
from couchdb import Database

map_fun = """
function(doc){
        emit(doc.name, doc.age);
}
"""
class Person(Document):
        name = TextField()
        age = IntegerField()
        by_name = View('people', map_fun)

db = Database("http://127.0.0.1:5984/borrame")

# to make a view permanent do this
from couchdb.design import ViewDefinition
ViewDefinition.sync_many(db, [Person.by_name])

Person(name = "batok", age = 48).store(db)
Person(name = "rgalvan", age = 47).store(db)
Person(name = "robert", age = 30).store(db)

for person in Person.by_name( db, limit = 3):
        print person.name, person.age

Introducing blogcdb

2008-12-22T16:18:00.003-06:00

I have created a new project at github.

It's blogcdb ( a blog engine that uses couchdb ).

The blog engine is made with turbogears 2, a very good python web framework.

Also uses dojo javascript framework for some fancy stuff. Dojo version 1.2.3 is included.

To store blog posts, comments and attachments , the erlang based couchdb document database engine is used.

Requirements:

couchdb-python module by Christopher Lenz and Jan Lenhardt.
python 2.6
turbogears 2 : trunk version which also needs a lot of modules.
dojo 1.2.3 ( included ).
couchdb ( svn truk version ) available from apache software foundation.
erlang/otp
mozilla's spidermonkey.

Get blogcdb at http://www.github.com/batok/blogcdb

A wxpython GUI interface to a blog.

2008-12-10T14:45:00.005-06:00

I have created a github project with the name couchdb-wxpython.

The project is a python script that uses:

wxpython ( a python module for GUI which is cross-platform. It is a wrapper for wxwidgets ).

couchdb , a document oriented database to store blogposts , comments and attachments.

The program can also take screenshots and store them as attachments into couchdb.

New attachment handling in couchdb-python module

2008-09-09T18:41:00.007-05:00

I've been trying out the new methods for the Database class in couchdb-python, in the svn repository.

I tried put_attachment.

Guess you already have a couchdb database called blog. To get a reference to the db you have to...

from couchdb.schema import *


class Post(Document):
    author = TextField()
    subject = TextField()
    content = TextField()
    tags = ListField( TextField() )
    comments = ListField( DictField(Schema.build(
        comment_author = TextField(),
        comment = TextField(),
        comment_date = DateTimeField()
    )))
    date = DateTimeField()

from couchdb import Server
from datetime import datetime
import binascii
s = Server("http://127.0.0.1:5984/")
s.create("blog")
blog = s["blog"]
p = Post( author = "Me", subject = "Whatever for the subject ", content = "Any content",date = datetime.now(), tags = ["Python", "Couchdb", "Blog"])

p.store(blog)

f = open("apythonfile.py", "rb")
foo = binascii.b2a_base64(f.read()) # this convert the content of the file to a encode 64 string

#put_attachment only works right now with an encoded string as I see and with a dictionary object for the document ( first parameter ) and not for a Document instance as used here , so...

blog = s["blog"]
adoc = blog[p.id]

and finally call the method...

blog.put_attachment( adoc, "apythonfile.py", foo, "text/python")

#you can't do blog.put_attachment( p, "apythonfile.py", f, "text/python") which I taught by reading the doc inside the method.

Yet another python frameworks' "which one is best for my project"

2008-07-18T17:08:00.005-05:00

Python web frameworks ( or libraries ) which I have used for real world projects.

1 - Zope 2 /Plone. This was the first one. Tal template system was nice to learn. Throw the web zope application server update is nice for designers but not for development ( despite I used cadaver webdav command line client which also uses vim ). In general, I didn't like Zope, because is not very pythonic.

2 - Nevow. This came second after asking in IRC channels about a good one framework to use. A guy convinced me to try it. Nevow is the swiss army knife of the python web frameworks. You can do the impossible with it , but it's very complex for simple , business like endeavors.

3 - After Nevow I gave Django a try and liked it. At the same time I gave Turbogears 1 a try after watching the wiki in 20 minutes screencast by TG's author Kevin Dangoor. Then I decided on embrace TG 1.

4. When TG 1.0 felt short to one of my project expectations I decided to use Pylons which I liked a lot. The problem with Pylons is that , becoming another "swiss army knife" as Nevow, simple things were ackward to do.

5 - Now it's time of a happy convergence : TG simplicity + Pylons , that is , Turbogears 2. So I have to say good bye to cherrypy , kid and sqlobject . Welcome Paste, gengshi, webob, sqlalchemy, toscawidgets, beaker, etc. At this very moment I think TG2 is "Easy Pylons".

Wxwidgets' messages in Spanish

2007-06-18T17:55:00.000-05:00

In a cpp wxwidgets app...

1 - Within the source wxwidgets , there's a samples folder.

2 - cd to samples folder , and then to calendar folder.

3 - Add this line before the end of the wxApp class in calendar.cpp...

wxLocale m_locale;

4 - Add these four at the beginning of the OnInit method of the inherited wxApp...

if( m_locale.Init()){
m_locale.AddCatalog(wxT("es"));
m_locale.AddCatalogLookupPathPrefix( wxT("."));

}

5 - Compile the sample with ... make -f makefile.unx ( this in MacOSX or any Unix)

6 - Do this if in MacOSX ...

$ mkdir calendar.app
$ cd calendar.app
$ mkdir Contents
$ cd Contents
$ mkdir MacOS
$ cd MacOS
$ ln -s ../../../calendar calendar
$ cd ../../..
$ open calendar.app

7 - If everything goes as expected days and months of the calendar widget get displayed in spanish.

In you want to apply this in a wxpython program...

1 - If you started your wxpython program with wx.PySimpleApp, ie ...
app = wx.PySimpleApp()

2 - add these lines after that ...

locale = wx.Locale()
if locale.Init(wx.LANGUAGE_DEFAULT , wx.LOCALE_LOAD_DEFAULT | wx.LOCALE_CONV_ENCODING ):
locale.AddCatalog("es")
locale.AddCatalogLookupPathPrefix(".")

3 - After this if your program , for example, uses wx.PreviewFrame, all messages in the frame and widgets will be displayed in Spanish!

wxPython ArtProvider images mini browser

2007-03-23T17:30:00.000-06:00


import wx
class MyFrame(wx.Frame):
    def __init__(self):
        title = "wx.ART browser"
        wx.Frame.__init__(self, None, -1, title, size = (200,300))

        li = ["wx.%s" % x for x in dir(wx) if x.startswith("ART")]

        lb = wx.ListBox(self, -1, choices = li, style=wx.LB_SINGLE)
        self.sb = wx.StaticBitmap(self, -1, wx.ArtProvider.GetBitmap(eval(li[0])))

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(lb)
        sizer.Add( [ 20, 20 ] , 0, wx.ALIGN_CENTER|wx.ALL, 5 )
        sizer.Add(self.sb, wx.ALIGN_CENTER|wx.ALL, 5)
        self.SetSizer(sizer)

        self.Bind(wx.EVT_LISTBOX, self.OnUpdateBitmap, lb)

    def OnUpdateBitmap(self, event):
        name = event.GetString()
        im = wx.ArtProvider.GetBitmap(eval(name))
        w, h = im.GetSize()
        self.sb.SetSize((w,h))
        self.sb.SetBitmap(im)


app = wx.PySimpleApp()
f = MyFrame()
f.Center()
f.Show()
app.MainLoop()

Scp of a screenshot ( using wxpython and paramiko )

2006-11-16T19:11:00.000-06:00

Try this one.
This takes a screenshot and send it to a server using scp ( paramiko )
All you need is WxPython.


import wx
import paramiko
import sys
from time import sleep

class Screenshot(object):
    def __init__(self, filename = "snap.png"):
        self.filename = filename
        try:
            p = wx.GetDisplaySize()
            self.p = p
            bitmap = wx.EmptyBitmap( p.x, p.y)
            dc = wx.ScreenDC()
            memdc = wx.MemoryDC()
            memdc.SelectObject(bitmap)
            memdc.Blit(0,0, p.x, p.y, dc, 0,0)
            memdc.SelectObject(wx.NullBitmap)
            bitmap.SaveFile(filename, wx.BITMAP_TYPE_PNG )
            
        except:
            self.filename = ""
        
def main():               
    paramiko.util.log_to_file('snap.log')
    
    caption = u"Required data"
    path = "/var/www/html/screenshots" # change this to make it your default path
    hostname = "www.whateverdomain.com" # change this to make it your default targe host
    username = "batok" # change this to make it your default user
    port = 22 # change this to another port if necessary....
    
    app = wx.PySimpleApp()
    time_to_wait = wx.GetNumberFromUser(message = "Time", 
                                        prompt = "Secs.",
                                         caption = "Enter Seconds to Wait...",
                                          value = 5,
                                            min = 5,
                                             max = 20,
                                              parent= None )
    try:
        tw = int(time_to_wait)
    except:
        sys.exit(-1)
    sleep( tw  )
    try:
        wx.Bell()
    except:
        pass
    
    s_shot = Screenshot()
    
    filename = s_shot.filename
    if filename == "":
        sys.exit(-1)
        
    if wx.YES == wx.MessageBox("Do you want to see the screenshot/nreduced by the half ?", "Hey!", wx.YES_NO | wx.ICON_QUESTION):
        dlg = wx.Dialog(None,-1, "Your screenshot half the size")
        img = wx.Image("snap.png" , wx.BITMAP_TYPE_ANY)
        w = img.GetWidth()
        h = img.GetHeight()
        img2 = img.Scale(w/2,h/2)
        wx.StaticBitmap(dlg,-1, wx.BitmapFromImage(img2))
        dlg.Fit()
        dlg.Show()
        
    
    target = "%s/%s" % ( path, filename )
    wx.MessageBox("A %s X %s screenshot\nis at %s" % (s_shot.p.x, s_shot.p.y, filename ), "Hey!")
    hostname = wx.GetTextFromUser("Host", caption = caption , default_value=hostname)
    username = wx.GetTextFromUser("User Name", caption = caption , default_value=username)
    password = wx.GetPasswordFromUser("Password", caption = caption )
    s_target = wx.GetTextFromUser("Destination File", caption= caption, default_value = target)
    
    if "" in (hostname, username, s_target):
        wx.MessageBox("Mmmm... some required fields are empty", "Hey!")
        sys.exit(-1)
    
    # Now paramiko's stuff... a.k.a secure copy
    try:
        
        t = paramiko.Transport((hostname, port))
        t.use_compression(True)
        t.connect(username=username, password=password, hostkey=None)
        sftp = paramiko.SFTPClient.from_transport(t)
        data = open(filename, 'rb').read()
        sftp.open(s_target, 'wb').write(data)
        t.close()
        wx.MessageBox("The %s file was sent to server" % filename, "Hey!")
    
    except Exception, e:
        print e
        try:
            t.close()
        except:
            pass
        
    return

if __name__ == "__main__":
    main()

Turbogears and Genshi baby steps

2006-09-20T17:30:00.000-05:00

These are the baby steps for using Genshi template system in Turbogears.

1 - In case you have not installed Genshi do....
easy_install Genshi

2 - Create a new turbogears project with...
tg-admin quickstart genshibasic

3 - Go to controllers.py in ./genshibasic/genshibasic directory

add this to the Root class


   @expose(template="genshi:genshibasic.templates.genshi")
   def genshi(self):
    return dict(pretty="basic")

4 - create a new template file ( genshi.html ) in the templates directory of the project.

include this in genshi.html ...

<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:py="http://genshi.edgewall.org/"
lang="en">
pretty ${pretty}
</html>

5 - Start your project with

python start-genshibasic.py

6 - Open your browser and type http://localhost:8080/genshi

Enjoy!
The rest is to study carefully genshi documentation to be a black belt.

A snap of the screen in wxPython and scp afterwards

2006-08-30T16:23:00.000-05:00

This python program takes a snapshot of the screen, saving it to snap.png file, and copying the file via sftp to a server.

Python 2.4 , Wxpython and paramiko are required.

---------------------------------------------------


import wx
import paramiko

paramiko.util.log_to_file('snap.log')
filename = "snap.png"
app = wx.PySimpleApp()
p = wx.GetDisplaySize()
bitmap = wx.EmptyBitmap( p.x, p.y)
dc = wx.ScreenDC()
memdc = wx.MemoryDC()
memdc.SelectObject(bitmap)
memdc.Blit(0,0, p.x, p.y, dc, 0,0)
memdc.SelectObject(wx.NullBitmap)
bitmap.SaveFile(filename, wx.BITMAP_TYPE_PNG )
hostname = wx.GetTextFromUser("Host")
username = wx.GetTextFromUser("User Name")
password = wx.GetPasswordFromUser("Password")
port = 22

wx.MessageBox("A %s X %s snap of the screen\nis at %s" % (p.x, p.y, filename ), "Hey!")


try:
   t = paramiko.Transport((hostname, port))
   t.connect(username=username, password=password, hostkey=None)
   sftp = paramiko.SFTPClient.from_transport(t)

   data = open(filename, 'rb').read()
   sftp.open(filename, 'wb').write(data)

   t.close()
   wx.MessageBox("The %s file was sent to server" % filename, "Hey!")

except Exception, e:
   print e
   try:
       t.close()
   except:
       pass

A snap of the screen in wxPython

2006-08-26T14:15:00.000-05:00

This python program takes a snapshot of the screen.
WxPython is required.

import wx
filename = "snap.png"
app = wx.PySimpleApp()
p = wx.GetDisplaySize()
bitmap = wx.EmptyBitmap( p.x, p.y)
dc = wx.ScreenDC()
memdc = wx.MemoryDC()
memdc.SelectObject(bitmap)
memdc.Blit(0,0, p.x, p.y, dc, 0,0)
memdc.SelectObject(wx.NullBitmap)
bitmap.SaveFile(filename, wx.BITMAP_TYPE_PNG )
wx.MessageBox("A %s X %s snap of the screen\nis at %s" % (p.x, p.y, filename ), "Hey!")

2006-08-18T17:22:00.000-05:00

vmware server win32 console

In search of the python web framework

2006-06-03T11:11:00.000-05:00

-Look no further, a good guy yell me at IRC.
Try Nevow.

That was about a year and half.

-If you are looking for a python based web framework try Nevow!, this guy insisted.

There was no Turbogears or Django then, the very hyped framewords of these very days.

TG and Django have good screencast and nice looking websites. Speaking about their features, well, they seem very well integrated. In the case of TG, an impressive tie of disperate projects. Django includes everything from the same project.

Despite facts and popularity of the two, I still love the swiss army knife freedom and power of Nevow.

Nevow has nice features!

2006-01-03T14:22:00.000-06:00

Nevow , a python based web construction toolkit , has a lot of nice features, that deserve attention:

1 - LivePage ( Ajax ).
2 - Canvas ( Flash to server ).
3 - XUL , the python way.
4 - Stan ( Python...ized XHTML )
5 - Formless ( automatic Form generation ).

Another one on wxPython

2005-08-23T07:36:00.000-05:00

I've made a python class ( wxpython ) to dump the contents of a wx.Grid or wx.ListCtrl to an excel file.

The class and a demo app is available at www.smartics.biz/site/descargas/index_html

The messages of the class and the demo app are in spanish.

Swatch and sendxmpp to rescue!

2005-08-12T13:39:00.000-05:00

In these days there are lots of kids using hacking tools that try to log in via ssh.

My servers are attacked every day in this way.

I decided to add swatch to monitor log files.

Also I installed sendxmpp to send xmpp messages ( jabber ) to my jabber server.

The combination is great!

Both tools, swatch and sendxmpp are written in Perl, and to be installed depend on other perl modules which are properly installed via cpan.

wxPython!

2005-08-09T23:54:00.000-05:00

wxPython , the marriage of wxWidgets and Python , is a very good option to develop multiplatform GUI apps.

Windows installation is a matter of running and exe, and follow the wizard.

For Mac OS X is a little bit trickier.

And for Linux , depends on the distro. For fedora core 3 or 4 is about compiling RPM source files and then installing the resulting binary RPM files.

2005-05-24T14:03:00.000-05:00

my desktop

Tips for today

2004-10-02T21:09:00.000-05:00

Fedora core 2:

Everything was ok with one of my customers. Each user accesing a dos based app from dosemu/freedos had been working smooth... until fedora core 2 arrived...

Well the change from Xfree86 to X.org had its consequences. The new fedora user couldn't run the app as the other people ( which had Mandrake and Redhat 8 and 9 installed ).

After several tries I decided to access the app from one of the RH9 users. So I did this bash script:

#!/bin/sh

FONTDIR=/home/blabla/dosemu/Xfonts
cd $FONTDIR
mkfontdir
xset +fp $FONTDIR
ssh user@machine "dosemu/xdosemu"

.....

Now the problem was with Squid...

How to make a user access everything related to yahoo but nothing else ?

The trick was editing the /etc/squid/squid.conf file by prepending the domain def in dstdomain directive with a . ( dot ) like this ...

acl yahoouser src 192.168.0.152

acl yahoo dstdomain .yahoo.com
acl yahoo2 dstdomain .yimg.com
http_access deny yahoouser !yahoo !yahoo2

( See the . before yahoo.com and yimg.com )

2004-09-28T12:26:00.000-05:00

Introducing my dhcpf.conf file

One more on Squid

2004-09-26T08:46:00.000-05:00

One example on configuring squid to let navigate user(s) only to selected places ( it needs Squid to be run on the machine which is resolving names [ may be using bind with resolv.conf pointing to 127.0.0.1 ]. Once I tried this on a machine which was resolved by another one and the dstdomain feature didn't work ):

acl myipaddress src 192.168.0.111
acl firstdomain dstdomain www.oneallowed.com
acl seconddomain dstdomain www.anotherallowed.com
...
...
http_access deny myipaddress !firstdomain !seconddomain

( this means , 192.168.0.111 can't access anything but www.oneallowed and www.anotherallowed ).

2004-09-24T12:37:00.000-05:00

Tks Robert for the help on Combos

2004-09-24T12:31:00.000-05:00

Ladies and Gentlemen: Bullwinkle

Screwdrivers

2004-09-23T19:30:00.000-05:00

One pseudo-cop got my 6 screwdriver set at Mexico City International Airport just before departure:

- You can't have these on the plane.

- Why not, do I look like a terrorist or what?

- No Mr. you don't. You have to go where the clerk is ( 2 miles away ).

- Hey Pal, my plane is about to take off and I need to...

- You must go where the clerk.

Suddenly I looked over my shoulders and the screen displayed -- 5 minutes to go.

- Mmm. Happy Birthday ( damn cop ) . This is my gift ( fk* asshole ).

Goodbye screwdriver set :(

Moral : "Never get a screwdriver set at Mexico City Airport"

2004-09-23T17:30:00.000-05:00

Music and Lyrics by Mr. Louis Klink

2004-09-20T19:43:00.000-05:00

It's all about Python, WxWidgets, Postgresql and Vim

2004-09-16T20:59:00.000-05:00

The way to post to blogger in python:

import xmlrpclib
server = xmlrpclib.server("http://plant.blogger.com/api/RPC2")
username = "your name goes here"
password = "your password goes here"
appkey = "your application key goes here, which is somewhat lenghty and hex"
blogid = "your blog number "
server.blogger.newPost( appkey, blogid, username, password, "Hello World", True)

Enjoy!

2004-09-16T20:50:00.000-05:00

This message was posted from
a python application
which is an interesting way of posting
Cheers!

Mexico's Independence Day

2004-09-15T21:35:00.000-05:00

Mexico's Independence Day (15-16 th September ) celebration is rainy
and fireworks are not lightning the sky. Fiesta at Glorieta Chapalita
is interrupted by season's hurricanes friend --> rain ...

2004-09-15T19:00:00.000-05:00

Psi ...

This is Psi, a jabber client program for Windows, in action

2004-09-15T17:14:00.000-05:00

I own this company and am the CEO.

Smartics

Squidview

2004-09-15T15:46:00.000-05:00

Squidview. A wonderful piece of software. Due to this nugget my squid's access.log file is easier to monitor ( bye tail -f /var/log/squid/access.log ).

The $HOME/.squidview/aliases file feature is great.

Finally I don't need to remember the IP address of every machine in the network.

Maybe some day I will port this software to wxPython.

Every blog has a start!

2004-09-06T15:40:00.000-05:00

Yeap, every blog has a start.

This is not an exception to that.

If you like music, chess and technology then you are somewhat like me.