Return images with matplotlib?

[Jan Danielsson]

Hello all,

I have written a program which takes some data from a postgresql
database, and via mod_python outputs it as tables on a web site. Now I
would like to present these tables as graphs, which matplotlib can do.
But in order to properly display these graphs on the web page, I need
to return the image data, like so:

def barchart(req, params):
some_format = matplotlib.generate_fancy_graph(params)
png_buf = make_png_buffer(some_format)
return png_buf

Is this possible? If so -- how?

--
Kind regards,
Jan Danielsson
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[Istvan Albert]

def barchart(req, params):
some_format = matplotlib.generate_fancy_graph(params)
png_buf = make_png_buffer(some_format)
return png_buf

Is this possible? If so -- how?

savefig does that. You can save to a file name or a buffer.

http://matplotlib.sourceforge.net/matplotlib.pylab.html#-savefig

i.

 

[Joshua J. Kugler]

Hello all,

I have written a program which takes some data from a postgresql
database, and via mod_python outputs it as tables on a web site. Now I
would like to present these tables as graphs, which matplotlib can do.
But in order to properly display these graphs on the web page, I need
to return the image data, like so:

def barchart(req, params):
some_format = matplotlib.generate_fancy_graph(params)
png_buf = make_png_buffer(some_format)
return png_buf

Is this possible? If so -- how?

If you are returning the buffer (and nothing else) directly to a browser you
can't print a Content-type header that says it's a png file, and the
browser will accept it as a graphic, as long as you call the script from
within an IMG tag.

j