Example 2 not working

[Damien-Raynaud]

Hi!

I tried to get example 2 working but I get the following error with most ETP computation methods:
Traceback (most recent call last):

  File "/home/damien/anaconda3/lib/python3.7/site-packages/pyet/utils.py", line 91, in get_index
    index = pandas.DatetimeIndex(df.index)
  File "/home/damien/anaconda3/lib/python3.7/site-packages/xarray/core/common.py", line 247, in __getattr__
    "{!r} object has no attribute {!r}".format(type(self).__name__, name)
AttributeError: 'DataArray' object has no attribute 'index'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pyet/combination.py", line 568, in priestley_taylor
    elevation, rso, a, b, None, albedo, as1, bs1, kab)
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pyet/rad_utils.py", line 93, in calc_rad_net
    ea=ea, kab=kab)  # [MJ/m2/d]
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pyet/rad_utils.py", line 153, in calc_rad_long
    tindex = get_index(rs)
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pyet/utils.py", line 93, in get_index
    index = pandas.DatetimeIndex(df.time)
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pandas/core/indexes/datetimes.py", line 315, in __new__
    ambiguous=ambiguous,
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pandas/core/arrays/datetimes.py", line 333, in _from_sequence_not_strict
    ambiguous=ambiguous,
  File "/home/damien/anaconda3/lib/python3.7/site-packages/pandas/core/arrays/datetimes.py", line 2023, in sequence_to_dt64ns
    assert isinstance(result, np.ndarray), type(result)
AssertionError: <class 'xarray.core.dataarray.DataArray'>

Thanks a lot!
Damien

[mvremec]

Hi Damien,

Please note that PyEt is only compatible with Python versions 3.8 and above. While this information is stated in the README file, we should also add it to the requirements for better visibility. To ensure compatibility, I would recommend using PyEt with Python 3.9.

Best,
Matevz