Exception when using "python -OO .."

[guziy]

Hi:

I've noticed that importing xarray fails when running a script using -OO option, as shown below.

$ python -OO test.py
Traceback (most recent call last):
  File "test.py", line 2, in <module>
    import xarray
  File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/__init__.py", line 10, in <module>
    from .core.extensions import (register_dataarray_accessor,
  File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/core/extensions.py", line 7, in <module>
    from .dataarray import DataArray
  File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/core/dataarray.py", line 10, in <module>
    from ..plot.plot import _PlotMethods
  File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/__init__.py", line 4, in <module>
    from .plot import (plot, line, contourf, contour,
  File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 555, in <module>
    @_plot2d
  File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 404, in _plot2d
    plotfunc.__doc__ = '\n'.join((plotfunc.__doc__, commondoc))
TypeError: sequence item 0: expected str instance, NoneType found
(py3.6) huziy at iMac-Sasha in ~/PythonProjects/xarray_playground


$ cat test.py

import xarray

# Paste the output here xr.show_versions() here In [2]: xr.__version__ Out[2]: '0.9.6'

In [8]: sys.version
Out[8]: '3.6.1 |Anaconda 4.4.0 (x86_64)| (default, May 11 2017, 13:04:09) \n[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)]'

[shoyer]

Thanks for the report, we'll look into this.

For reference (I had to look this up): -OO strips out docstrings, which explains why __doc__ is None instead of a string.