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import sys
import unittest
import os
import tempfile
from netCDF4 import Dataset, CompoundType
import numpy as np
from numpy.testing import assert_array_equal, assert_array_almost_equal
# test compound attributes.
FILE_NAME = tempfile.NamedTemporaryFile(suffix='.nc', delete=False).name
DIM_NAME = 'time'
VAR_NAME = 'wind'
VAR_NAME2 = 'forecast_wind'
GROUP_NAME = 'forecasts'
dtype=np.dtype([('speed', 'f4'), ('direction', 'f4')])
TYPE_NAME = 'wind_vector_type'
TYPE_NAMEC = 'wind_vectorunits_type'
dtypec=np.dtype([('speed', 'S8'), ('direction', 'S8')])
missvals = np.empty(1,dtype)
missvals['direction']=1.e20
missvals['speed']=-999.
windunits = np.empty(1,dtypec)
windunits['speed'] = 'm/s'
windunits['direction'] = 'degrees'
class VariablesTestCase(unittest.TestCase):
def setUp(self):
self.file = FILE_NAME
f = Dataset(self.file, 'w')
d = f.createDimension(DIM_NAME,None)
g = f.createGroup(GROUP_NAME)
wind_vector_type = f.createCompoundType(dtype, TYPE_NAME)
wind_vectorunits_type = f.createCompoundType(dtypec, TYPE_NAMEC)
v = f.createVariable(VAR_NAME,wind_vector_type, DIM_NAME)
vv = g.createVariable(VAR_NAME2,wind_vector_type,DIM_NAME)
v.missing_values = missvals
v.units = windunits
vv.missing_values = missvals
vv.units = windunits
f.close()
def tearDown(self):
# Remove the temporary files
os.remove(self.file)
def runTest(self):
"""testing compound attributes"""
f = Dataset(self.file, 'r')
v = f.variables[VAR_NAME]
g = f.groups[GROUP_NAME]
vv = g.variables[VAR_NAME2]
assert_array_almost_equal(v.missing_values['speed'], missvals['speed'])
assert_array_almost_equal(v.missing_values['direction'],\
missvals['direction'])
assert_array_almost_equal(vv.missing_values['speed'], missvals['speed'])
assert_array_almost_equal(vv.missing_values['direction'],\
missvals['direction'])
assert_array_equal(v.units['speed'], windunits['speed'].squeeze())
assert_array_equal(v.units['direction'],\
windunits['direction'].squeeze())
assert_array_equal(vv.units['speed'], windunits['speed'].squeeze())
assert_array_equal(vv.units['direction'],\
windunits['direction'].squeeze())
assert v.units['speed'] == b'm/s'
assert v.units['direction'] == b'degrees'
assert vv.units['speed'] == b'm/s'
assert vv.units['direction'] == b'degrees'
f.close()
if __name__ == '__main__':
unittest.main()
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