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  • build local docs using matplotlib Agg backend · 6 ✖

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128503193 https://github.com/pydata/xarray/pull/518#issuecomment-128503193 https://api.github.com/repos/pydata/xarray/issues/518 MDEyOklzc3VlQ29tbWVudDEyODUwMzE5Mw== clarkfitzg 5356122 2015-08-06T20:46:42Z 2015-08-06T20:46:42Z MEMBER

``` In [1]: import matplotlib

In [2]: import matplotlib.pyplot

In [3]: matplotlib.use('Agg') /Users/clark.fitzgerald/anaconda/envs/xray_dev/lib/python2.7/site-packages/matplotlib/init.py:1318: UserWarning: This call to matplotlib.use() has no effect because the backend has already been chosen; matplotlib.use() must be called before pylab, matplotlib.pyplot, or matplotlib.backends is imported for the first time.

warnings.warn(_use_error_msg) ```

 
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   build local docs using matplotlib Agg backend 99513363
128502431 https://github.com/pydata/xarray/pull/518#issuecomment-128502431 https://api.github.com/repos/pydata/xarray/issues/518 MDEyOklzc3VlQ29tbWVudDEyODUwMjQzMQ== clarkfitzg 5356122 2015-08-06T20:43:19Z 2015-08-06T20:43:19Z MEMBER

But really if people need to use a particular backend (like in our case) they should be setting it in the first place. Seaborn doesn't go beyond what pyplot does here, so I think it's ok.

 
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   build local docs using matplotlib Agg backend 99513363
128502013 https://github.com/pydata/xarray/pull/518#issuecomment-128502013 https://api.github.com/repos/pydata/xarray/issues/518 MDEyOklzc3VlQ29tbWVudDEyODUwMjAxMw== clarkfitzg 5356122 2015-08-06T20:41:19Z 2015-08-06T20:41:19Z MEMBER

Yes, this is a little tricky. Internally Seaborn uses lots of pyplot. And importing pyplot sets the backend. So maybe they could try something like pyplot.switch_backend within their reset_orig function?

 
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   build local docs using matplotlib Agg backend 99513363
128498171 https://github.com/pydata/xarray/pull/518#issuecomment-128498171 https://api.github.com/repos/pydata/xarray/issues/518 MDEyOklzc3VlQ29tbWVudDEyODQ5ODE3MQ== jhamman 2443309 2015-08-06T20:28:00Z 2015-08-06T20:28:00Z MEMBER

nice. maybe raise an issue over at seaborn? I think they try to (should) have round trip zero net change to the matplotlib namespace if you do these two commands:

python import seaborn seaborn.reset_orig()

But since the backend can't be set twice, this doesn't work.

 
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   build local docs using matplotlib Agg backend 99513363
128494659 https://github.com/pydata/xarray/pull/518#issuecomment-128494659 https://api.github.com/repos/pydata/xarray/issues/518 MDEyOklzc3VlQ29tbWVudDEyODQ5NDY1OQ== clarkfitzg 5356122 2015-08-06T20:15:57Z 2015-08-06T20:15:57Z MEMBER

Explanation-

Looks like the backend is set when Seaborn is imported. When building the docs we don't want to use an interactive backend.

``` (xray_dev)testimage ~/dev/xray/doc $ ipython Python 2.7.10 |Continuum Analytics, Inc.| (default, May 28 2015, 17:04:42)

...

In [1]: import seaborn

In [2]: import matplotlib

In [3]: matplotlib.use('Agg') /Users/clark.fitzgerald/anaconda/envs/xray_dev/lib/python2.7/site-packages/matplotlib/init.py:1318: UserWarning: This call to matplotlib.use() has no effect because the backend has already been chosen; matplotlib.use() must be called before pylab, matplotlib.pyplot, or matplotlib.backends is imported for the first time.

warnings.warn(_use_error_msg) ```

 
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   build local docs using matplotlib Agg backend 99513363
128492304 https://github.com/pydata/xarray/pull/518#issuecomment-128492304 https://api.github.com/repos/pydata/xarray/issues/518 MDEyOklzc3VlQ29tbWVudDEyODQ5MjMwNA== jhamman 2443309 2015-08-06T20:11:45Z 2015-08-06T20:11:45Z MEMBER

I just tested this locally and it works. Got to love the one line fixes. Once all the tests pass, I think you can merge this.

 
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   build local docs using matplotlib Agg backend 99513363

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