issues: 237325677

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
237325677 MDU6SXNzdWUyMzczMjU2Nzc= 1461 Bug: Faceting fails with levels (easy to fix) 15937254 closed 0     2 2017-06-20T19:52:30Z 2018-04-02T21:26:17Z 2018-03-06T05:05:59Z NONE      

Faceting example fails with levels Python flatui = ["#9b59b6", "#3498db", "#95a5a6", "#e74c3c", "#34495e", "#2ecc71"] g_simple = t.plot(x='lon', y='lat', col='time', col_wrap=3, levels=[0, 12, 18, 30], colors=flatui) The generated error is

ValueError: Can't specify both cmap and colors.

I tracked this down inside newplotfunc to the line Python return _easy_facetgrid(**allargs) which calls FacetGrid.map_dataarray

This function does not check if levels is assigned. And hence automatically adds a cmap on the second panel of the plot ```Python cmap_args = inspect.getargspec(_determine_cmap_params).args cmap_kwargs.update((a, kwargs[a]) for a in cmap_args if a in kwargs)

    cmap_params = _determine_cmap_params(**cmap_kwargs)

```

the check fails after that. 

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   completed 13221727 issue

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