It has no way of deducing the file format from the file object.
You need to explicitly pass the format keyword to savefig, e.g.:
savefig(f, format='pdf')
Mike
On 03/15/2011 07:11 AM, Giovanni Luca Ciampaglia wrote:
> Hi all,
> I call savefig by passing to it a file-like object but it appears to not
> get the graphics format right:
>
> f = open('not_a_pdf.pdf', 'w')
> plot([1,2,3])
> savefig(f)
>
> but it produces a PNG image. Can anybody confirm this? I am on
> matplotlib 0.99.3
>
> Cheers,
>
> Giovanni
>
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--
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA
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