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import sys
import unittest
import os
import tempfile
from numpy.testing import assert_almost_equal
import netCDF4
import math
VAR_NAME='temp'
VAR_TYPE='f4'
VAR_VAL=math.pi
FILE_NAME = tempfile.NamedTemporaryFile(suffix='.nc', delete=False).name
GROUP_NAME = 'subgroup'
# test scalar variable creation and retrieval.
class ScalarVariableTestCase(unittest.TestCase):
def setUp(self):
self.file = FILE_NAME
rootgrp = netCDF4.Dataset(self.file, 'w')
# scalar variable.
temp = rootgrp.createVariable(VAR_NAME,VAR_TYPE)
#temp[:] = VAR_VAL
temp.assignValue(VAR_VAL)
subgroup = rootgrp.createGroup(GROUP_NAME)
tempg = subgroup.createVariable(VAR_NAME,VAR_TYPE)
tempg[:] = VAR_VAL
#tempg.assignValue(VAR_VAL)
rootgrp.close()
def tearDown(self):
# Remove the temporary file
os.remove(self.file)
def runTest(self):
"""testing scalar variables"""
# check dimensions in root group.
f = netCDF4.Dataset(self.file, 'r+')
v = f.variables[VAR_NAME]
# dimensions and shape should be empty tuples
self.assertTrue(v.dimensions == ())
self.assertTrue(v.shape == ())
# check result of getValue and slice
assert_almost_equal(v.getValue(), VAR_VAL, decimal=6)
assert_almost_equal(v[:], VAR_VAL, decimal=6)
g = f.groups[GROUP_NAME]
vg = g.variables[VAR_NAME]
# dimensions and shape should be empty tuples
self.assertTrue(vg.dimensions == ())
self.assertTrue(vg.shape == ())
# check result of getValue and slice
assert_almost_equal(vg.getValue(), VAR_VAL, decimal=6)
assert_almost_equal(vg[:], VAR_VAL, decimal=6)
f.close()
if __name__ == '__main__':
unittest.main()
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