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Fix decode_cf_variable. #153

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Fix decode_cf_variable. #153

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4012fb9
Fix decode_cf_variable.
Jun 12, 2014
16f1720
use variable.as_variable()
Jun 12, 2014
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23 changes: 22 additions & 1 deletion test/test_conventions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
import pandas as pd
import warnings

from xray import conventions
from xray import conventions, Dataset
from . import TestCase, requires_netCDF4


Expand Down Expand Up @@ -139,6 +139,27 @@ def test_slice_decoded_cf_datetime_array(self):
self.assertEqual(actual.dtype, np.dtype('datetime64[ns]'))
self.assertArrayEqual(actual[[0, 2]], expected[[0, 2]])

@requires_netCDF4
def test_decode_cf_variable(self):
ds = Dataset({'time': ('time', [0, 1, 2],
{'units': 'days since 1900-01-01',
'calendar': 'standard'})})
actual = conventions.decode_cf_variable(ds['time'])
expected = pd.date_range('1900-01-01', periods=3).values
self.assertEqual(actual.dtype, np.dtype('datetime64[ns]'))
self.assertArrayEqual(actual.values, expected)

actual = conventions.decode_cf_variable(ds['time'].variable)
self.assertEqual(actual.dtype, np.dtype('datetime64[ns]'))
self.assertArrayEqual(actual.values, expected)

# default calendar
ds = Dataset({'time': ('time', [0, 1, 2],
{'units': 'days since 1900-01-01'})})
actual = conventions.decode_cf_variable(ds['time'])
self.assertEqual(actual.dtype, np.dtype('datetime64[ns]'))
self.assertArrayEqual(actual.values, expected)

@requires_netCDF4
def test_decode_non_standard_calendar(self):
import netCDF4 as nc4
Expand Down
5 changes: 3 additions & 2 deletions xray/conventions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -413,7 +413,8 @@ def get_to(source, dest, k):

def decode_cf_variable(var, concat_characters=True, mask_and_scale=True,
decode_times=True):
# use _data instead of data so as not to trigger loading data
var = xray.variable.as_variable(var)
# use _data instead of values so as not to trigger loading data
data = var._data
dimensions = var.dimensions
attributes = var.attrs.copy()
Expand All @@ -433,7 +434,7 @@ def pop_to(source, dest, k):
return v

if 'dtype' in encoding:
if var.data.dtype != encoding['dtype']:
if data.dtype != encoding['dtype']:
raise ValueError("Refused to overwrite dtype")
encoding['dtype'] = data.dtype

Expand Down