ImportError: C extension for ANA is missing, please rebuild

[Pete Riley]

Hi, 

I've installed SunPy and ran the self test, but get a number of errors related to ana.py and test_ana.py. Here are a couple of them:

E           ImportError: C extension for ANA is missing, please rebuild

anaconda/lib/python2.7/site-packages/sunpy/io/ana.py:119: ImportError

___________________________________________ test_i16c ___________________________________________

    @skip_ana

    def test_i16c():

        # Test int 16 compressed functions

        afilename = tempfile.NamedTemporaryFile().name

>       ana.write(afilename, img_i16, 'testcase', 0)

anaconda/lib/python2.7/site-packages/sunpy/io/tests/test_ana.py:44: 

Perhaps related, or not, but when trying out some of the tutorial examples I get the following error. I'm not sure how to invoke the "download_sample_data(). It doesn't work as an "import". 

Thanks in advance for any guidance, Pete

>>> import sunpy.data.sample

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/Users/pete/anaconda/lib/python2.7/site-packages/sunpy/data/sample.py", line 16, in <module>

    raise ImportError("Sample data file(s) missing. Use sunpy.data.download_sample_data() to get them.")

ImportError: Sample data file(s) missing. Use sunpy.data.download_sample_data() to get them.

>>> 

>>> 

>>> import sunpy.data.download_sample_data()

  File "<stdin>", line 1

    import sunpy.data.download_sample_data()

                                          ^

SyntaxError: invalid syntax

[Nabil Freij]

Hi Pete,

If I recall correctly, there are several cases where the ANA C extension is not compiled because we do not support it under all systems or python versions at the moment. You should be able to ignore those ANA warnings as long as you do not plan to use it. 

Regarding the sample data download, you need to do something like this:

>>> from sunpy.data import download_sample_data

>>> download_sample_data()

You can not call a function at import time.

Many thanks,

Nabil

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[Stuart Mumford]

Hi Pete,

By what method did you install SunPy? You should not be getting that error, because if you installed on windows where we don't support ANA it should be disabled.

Stuart

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[Pete Riley]

Hi Nabil, 

Perfect, thanks  - that'll what it took to fix it. 

Pete

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[Pete Riley]

Hi Stuart, 

I installed it following conda:

conda install sunpy

I'm running it on OS X Sierra. 

Cheers, Pete

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[Nabil Freij]

Hi Pete,

Theoretically the ANA extension should compile on MacOS but the lack of my own test platform makes it difficult to test fully. Sorry about the problems you're having with it! 

Kind regards,

Nabil

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