Re: dynamically creating html code with python...

anartz at anartz.cjb.net anartz at anartz.cjb.net
Tue Aug 12 00:03:02 CEST 2008


btw, credits for the code shown below also for:

http://bitworking.org/news/Sparklines_in_data_URIs_in_Python

Anartz at anartz.cjb.net wrote :

> This makes sense. Thanks!
> 
> I managed to get what I wanted with something similar to what you suggested:
> 
> [CODE]
> print "Content-Type: text/html\n\n"
> html="""
> <html>
>     <head>
>         <title>
>             data analysis site
>         </title>
>     </head>
>     <body>
>         <p>This is a test</p>
>         <IMG SRC="%s" />
>         <p>After image text</p>
>     </body>
> </html>"""
> 
> print html % myChartsLib.myPlotType(TheData)
> [/CODE]
> 
> and the script returns
> 
> [CODE]
>     f = StringIO.StringIO()
>     pylab.savefig(f)
>     return 'data:image/png,' + urllib.quote(f.getvalue())
> [/CODE]
> 
> This works fine in Firefox, but not in IE7. Any ideas why?
> 
> BTW, you are right about me not having a clue about http. It's the first time I try to do something with it. May be you could point me out to some good links where I can learn.
> 
> I will take a look into Mako too.
> 
> Thanks again.
> 
> Bruno Desthuilliers <bdesth.quelquechose at free.quelquepart.fr> wrote :
> 
> > anartz at anartz.cjb.net a écrit :
> > > Sorry, my fault...
> > > 
> > > I am trying to build a web application for data analysis. Basically
> > > some data will be read from a database and passed to a python script
> > > (myLibs.py) to build an image as follows.
> > > 
> > > [CODE] 
> > > f=urllib.urlopen("http://localhost/path2Libs/myLibs.py",urllib.urlencode(TheData))
> > >  print "Content-type: image/png\n" 
> >  > print f.read()
> >  > f.close()
> >  > [/CODE]
> > > 
> > > This section behaves as expected, and I can see the chart on the
> > > web-page.
> > 
> > Indeed. Using an http request to call a local script is totally 
> > braindead, but this is another problem.
> > 
> > > Now, I would like to add some text and possibly more charts
> > > (generated in the same way) to my web-page.
> > 
> > Which one ? What you showed is a way to generate an image resource (with 
> > mime-type 'image/png'), not an html page resource (mime-type : 
> > text/html). Images resources are not directly embedded in html pages - 
> > they are *referenced* from web pages (using an <img> tag), then it's up 
> > to the user-agent (usually, the browser) to emit another http request to 
> > get the image.
> > 
> > 
> > > This is what I need help
> > > with.
> > 
> > Not tested (obviously), but what you want is something like:
> > 
> > print "Content-type: text/html\n"
> > print """
> > <html>
> >    <head>
> >      <title>data analysis site</title>
> >    </head>
> >    <body>
> >      <p>This is a trial test</p>
> >      <img src="http://localhost/myLibs/ChartLib.py?%s" />
> >    </body>
> > </html>
> > """ % urllib.urlencode(TheData)
> > 
> > 
> > > My question: How can I use python to dynamically add descriptive
> > > comments (text), and possibly more charts to the web-page?
> > 
> > The code you showed so far either tried to add text/html to an image 
> > (that is, binary data), or to embed the image's binary data into 
> > text/html. None of this makes sense. Period.  The problem is not with 
> > Python. The problem is that you can't seriously hope to do web 
> > programming without any knowledge of the http protocol.
> > 
> > Also and FWIW, you'd be better using a decent templating system (mako, 
> > cheetah, genshi, tal, whatever fits your brain) instead of generating 
> > html that way.
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> 
> 
> 
> --
> http://mail.python.org/mailman/listinfo/python-list






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