Re: [Matplotlib-users] Best way to display image from URL in Python3

[Ryan N. <rne...@gm...>]

Thanks, Ben. I should have made that more clear. If I run the code from the
PR, I get the following error:

Traceback (most recent call last):
  File "junk.py", line 11, in <module>
    image = pyplot.imread(data)  # crash on py3.x
  File
"/home/nelson/apps/miniconda/lib/python3.4/site-packages/matplotlib/pyplot.py",
line 2215, in imread
    return _imread(*args, **kwargs)
  File
"/home/nelson/apps/miniconda/lib/python3.4/site-packages/matplotlib/image.py",
line 1270, in imread
    return handler(fname)
RuntimeError: _image_module::readpng: file not recognized as a PNG file

My code that I'm trying to port essentially does the same thing, and I get
the same error. I ran this example just now from Anaconda Python 3.4
install with MPL 1.4.3.

My impression from the PR was that this should work out of the box now. I
figured that maybe that was not quite the case. The implementations between
Py2 and 3 are quite different. Figured there must be a different way that I
wasn't aware of.

Ryan

On Fri, Mar 20, 2015 at 9:51 AM, Benjamin Root <ben...@ou...> wrote:

> According to the PR you reference, the fix for this was merged back in Jan
> 2013, so that means that this fix is in version 1.2.x and up. Are you
> saying that you still can't do imread(urllib.request.urlopen(url))?
>
> On Thu, Mar 19, 2015 at 8:54 PM, Ryan Nelson <rne...@gm...>
> wrote:
>
>> Hello all,
>>
>> I'm porting over some code that used Py2.7 urllib2.urlopen(url) to grab
>> some image data from the net and load with pyplot.imread. It doesn't work
>> quite right in Py3.4. I found a couple of refs:
>>
>> https://github.com/matplotlib/matplotlib/pull/1650
>>
>> http://stackoverflow.com/questions/15183170/python-crash-when-downloading-image-as-numpy-array
>>
>> They suggest io.BytesIO(urllib.request.urlopen(url).read()) as a
>> replacement for Py3. Is this the best practice? Does anyone know a simpler
>> way to do this?
>>
>> Ryan
>>
>>
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>