ValueError trying to open pandas.DateOffset objects in Variable Explorer

[CAM-Gerlach]

Problem Description

When attempting to open a ``pandas.DateOffset object in the Variable Explorer, a ValueError is raised. We may not officially support all pandas (or arbitrary) datatypes until Spyder 4, but this should at least be handled more gracefully.

What steps will reproduce the problem?

1. Create a DateOffset object

test_dateoffset = pd.DateOffset()

2. Attempt to open it in a CollecitonsEditor by double clicking it in Variable Explorer.

3. The error then occurs.

Traceback

Opening DateOffset error:

   File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 528, in createEditor
    readonly=readonly)
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 1339, in setup
    remote=remote)
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 1287, in __init__
    title)
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 1164, in __init__
    minmax=minmax)
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 121, in __init__
    self.set_data(data)
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 169, in set_data
    self.set_size_and_type()
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 189, in set_size_and_type
    for index in range(start, stop) ]
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 189, in <listcomp>
    for index in range(start, stop) ]
  File "C:\Users\C. A. M. Gerlach\Documents\dev\SpyderDev\spyder\spyder\widgets\variableexplorer\collectionseditor.py", line 86, in __getitem__
    attribute_toreturn = getattr(self.__obj__, key)
  File "C:\Anaconda3\envs\spyder-dev\lib\site-packages\pandas\tseries\offsets.py", line 530, in nanos
    raise ValueError("{name} is a non-fixed frequency".format(name=self))
ValueError: <DateOffset> is a non-fixed frequency

Package Versions

• Spyder 3.2.7
• Python 3.6.4
• Qt 5.6.2
• PyQt5 5.6
• Windows 8.1

Dependencies

pyflakes >=0.6.0 :  1.6.0 (OK)
pycodestyle >=2.3:  2.3.1 (OK)
pygments >=2.0   :  2.2.0 (OK)
pandas >=0.13.1  :  0.22.0 (OK)
numpy >=1.7      :  1.14.0 (OK)
sphinx >=0.6.6   :  1.7.1 (OK)
rope >=0.9.4     :  0.10.7 (OK)
jedi >=0.9.0     :  0.11.1 (OK)
nbconvert >=4.0  :  5.3.1 (OK)
sympy >=0.7.3    :  1.1.1 (OK)
cython >=0.21    :  0.27.3 (OK)
qtconsole >=4.2.0:  4.3.1 (OK)
IPython >=4.0    :  6.2.1 (OK)
pylint >=0.25    :  1.8.2 (OK)