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how to save a picture which is plotted by 'matplotlib' to a field.binary() ?

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vx2008

Now each time I save the picture which is plotted by 'matplotlib' on hard disk and then upload it to field.binary() filed;

I want to know whether I could save the picture into field.binary() filed when it was plotted immediately.

vx2008

Autor Beste Antwort

hi Axel, thanks for your reply; I have made some try according to your advice but still failed; my main code is as below:

....

picture=fields.binary()

....

plt.figure(figsize=(8.2, 6))

plt.bar(xTem, aa, width=0.35, facecolor='lightskyblue', edgecolor='white', label='aa') xTem = [x + 0.35 for x in xTem] plt.bar(xTem, Aa, width=0.35, facecolor='yellowgreen', edgecolor='white', label='Aa')

plt.savefig('d:\a1.png')

pic_data = open('d:\a1.png', 'rb').read()

self.write({'picture': base64.encodestring(pic_data)})

These code run well, but I should save it to hard disk first and then upload;

how shall I "save it into the binary fields"?

Axel Mendoza

that's because you are saving it to the disk and it's not needed, savefig could handle a file like object as states http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.savefig

you could do:

try:

from cStringIO import StringIO

except ImportError:

from StringIO import StringIO

pic_data = StringIO()

plt.savefig(pic_data)

self.write({'picture': base64.encodestring(pic_data.getvalue())})

vx2008

Autor

thanks a lot; it is very useful.

vx2008