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tst_utils.py
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tst_utils.py
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from numpy.testing import assert_equal
from netCDF4.utils import _StartCountStride, _out_array_shape
import unittest
import numpy as np
class TestgetStartCountStride(unittest.TestCase):
def test_basic(self):
# Basic usage
elem = [0, slice(None), slice(None)]
start, count, stride, put_ind = _StartCountStride(elem, (50, 4, 10))
assert_equal(start, 0)
assert_equal(count[..., 0], 1)
assert_equal(count[..., 1], 4)
assert_equal(count[..., 2], 10)
assert_equal(stride, 1)
assert_equal(put_ind[...,0], -1)
assert_equal(put_ind[...,1], slice(None))
assert_equal(put_ind[...,2], slice(None))
assert_equal(_out_array_shape(count), (1, 4,10))
def test_slice(self):
# start and stop slice
elem = [5, slice(None), slice(5, 8, 2)]
start, count, stride, put_ind = _StartCountStride(elem, (50, 4, 10))
assert_equal(start[..., 0], 5)
assert_equal(start[..., 1], 0)
assert_equal(start[..., 2], 5)
assert_equal(count[..., 0], 1)
assert_equal(count[..., 1], 4)
assert_equal(count[..., 2], 2)
assert_equal(stride[..., 2], 2)
assert_equal(_out_array_shape(count), (1, 4,2))
def test_fancy(self):
# Fancy indexing
elem = [slice(None), [1,2,3], 8]
start, count, stride, put_ind = _StartCountStride(elem, (50, 4, 10))
assert_equal(start[..., 0], 0)
assert_equal(start[..., 1].squeeze(), 1)
assert_equal(start[..., 2], 8)
assert_equal(count[...,0], 50)
assert_equal(count[...,1], 3)
assert_equal(count[...,2], 1)
assert_equal(put_ind[...,1].squeeze(), slice(None, None, None))
assert_equal(_out_array_shape(count), (50, 3, 1))
i = np.array([2,5,7],'i4')
elem = [slice(None, -1,2),i,slice(None)]
start, count, stride, put_ind = _StartCountStride(elem, (9,10,11))
try:
elem = ( np.arange(6).reshape((3,2)), slice(None), slice(None) )
start, count, stride, put_ind = _StartCountStride(elem, (3,4,5))
except IndexError:
pass
# this one should be converted to a slice
elem = [slice(None), [1,3,5], 8]
start, count, stride, put_ind = _StartCountStride(elem, (50, 6, 10))
# pull request #683 now does not convert integer sequences to strided
# slices.
#assert_equal(put_ind[...,1].squeeze(), slice(None,None,None))
assert_equal(put_ind[...,1].squeeze(), [0,1,2])
def test_multiple_sequences(self):
elem = [[4,6,7], [1,2,3], slice(None)]
start, count, stride, put_ind = _StartCountStride(elem, (50, 4, 10))
assert_equal(_out_array_shape(count), (3, 3, 10))
assert_equal(start[..., 0].squeeze(), [4,6,7])
assert_equal(start[..., 1].squeeze(), [1,1,1])
assert_equal(start[..., 2], 0)
assert_equal(count[...,0], 1)
assert_equal(count[...,1], 3)
assert_equal(count[...,2], 10)
i = [1,3,4]
elem = (i, i, i)
start, count, stride, put_ind = _StartCountStride(elem, (50, 5, 10))
assert_equal(_out_array_shape(count), (3,3,3))
def test_put_indices(self):
elem = (1, slice(None), slice(None))
start, count, stride, put_ind = _StartCountStride(elem, (3,4,5))
orig = np.arange(60).reshape((3,4,5))
dest = np.empty(_out_array_shape(count))
dest[tuple(put_ind[0,0,0])] = orig[tuple(elem)]
def test_boolean(self):
elem = (1, slice(None), np.array([True, True, False, False, True]))
start, count, stride, put_ind = _StartCountStride(elem, (50, 4,5))
assert_equal(start[..., 2].squeeze(), [0,1,4])
assert_equal(count[...,2], 1)
assert_equal(_out_array_shape(count), (1, 4, 3))
# Multiple booleans --- The behavior is different from NumPy in this case.
elem = (np.array([True, True, False]), np.array([True, True, False, True]), slice(None))
start, count, stride, put_ind = _StartCountStride(elem, (3,4,5))
assert_equal(_out_array_shape(count), (2,3,5))
try:
elem = (np.array([True, True, False]), np.array([True, True, True, False]), slice(None))
except IndexError:
pass
def test_1d(self):
# Scalar
elem = (0)
start, count, stride, put_ind = _StartCountStride(elem, (10,))
assert_equal(start, 0)
assert_equal(count, 1)
assert_equal(stride, 1)
assert_equal(put_ind, -1)
elem = (-1)
start, count, stride, put_ind = _StartCountStride(elem, (10,))
assert_equal(start, 9)
assert_equal(count, 1)
assert_equal(stride, 1)
assert_equal(put_ind, -1)
# test conversion of a integer index array to a slice
elem = (np.array([0,1]))
start, count, stride, put_ind = _StartCountStride(elem, (10,))
assert_equal(start, 0)
assert_equal(count, 2)
assert_equal(stride, 1)
assert_equal(put_ind[:,0], slice(None,None,None))
# Slice
elem = (slice(2,5,2))
start, count, stride, put_ind = _StartCountStride(elem, (10,))
assert_equal(start, 2)
assert_equal(count, 2)
assert_equal(stride, 2)
assert_equal(put_ind, slice(None))
# Integer sequence
elem = ([2,4,7])
start, count, stride, put_ind = _StartCountStride(elem, (10,))
assert_equal(start.squeeze(), [2,4,7])
assert_equal(count, 1)
assert_equal(stride, 1)
assert_equal(put_ind[:,0], [0,1,2])
# Boolean slicing
elem = (np.array([True, True, False, True, False]),)
start, count, stride, put_ind = _StartCountStride(elem, (5,))
assert_equal(start.squeeze(), [0,1,3])
assert_equal(count, 1)
assert_equal(stride, 1)
assert_equal(put_ind[:,0], [0,1,2])
# Integer sequence simplification
elem = ([2,3,4])
start, count, stride, put_ind = _StartCountStride(elem, (10,))
assert_equal(start, 2)
assert_equal(count, 3)
assert_equal(stride, 1)
assert_equal(put_ind, slice(None))
# Boolean indices simplification
elem = (np.array([False, True, True, True, False]))
start, count, stride, put_ind = _StartCountStride(elem, (5,))
assert_equal(start, 1)
assert_equal(count, 3)
assert_equal(stride, 1)
assert_equal(put_ind, slice(None))
# All False
elem = (np.array([False, False, False, False]))
start, count, stride, put_ind = _StartCountStride(elem, (4,))
assert_equal(count, 0)
assert_equal(_out_array_shape(count), (0,))
def test_ellipsis(self):
elem=(Ellipsis, slice(1, 4))
start, count, stride, put_ind = _StartCountStride(elem, (22,25,4))
assert_equal(start[0,0,0], [0, 0, 1])
assert_equal(count[0,0,0], (22, 25, 3))
assert_equal(put_ind[0,0,0], (slice(None), slice(None), slice(None)))
elem=(Ellipsis, [15,16,17,18,19], slice(None), slice(None))
start, count, stride, put_ind = _StartCountStride(elem, (2,10,20,10,10))
assert_equal(start[0,0,0,0,0], [0, 0, 15, 0, 0])
assert_equal(count[0,0,0,0,0], (2, 10, 5, 10, 10))
assert_equal(put_ind[0,0,0,0,0], (slice(None), slice(None), slice(None), slice(None), slice(None)))
try:
elem=(Ellipsis, [15,16,17,18,19], slice(None))
start, count, stride, put_ind = _StartCountStride(elem, (2,10,20,10,10))
assert_equal(None, 'Should throw an exception')
except IndexError as e:
assert_equal(str(e), "integer index exceeds dimension size")
try:
elem=(Ellipsis, [15,16,17,18,19], Ellipsis)
start, count, stride, put_ind = _StartCountStride(elem, (2,10, 20,10,10))
assert_equal(None, 'Should throw an exception')
except IndexError as e:
assert_equal(str(e), "At most one ellipsis allowed in a slicing expression")
class TestsetStartCountStride(unittest.TestCase):
def test_basic(self):
grp = FakeGroup({'x':False, 'y':False, 'time':True})
elem=(slice(None), slice(None), 1)
start, count, stride, take_ind = _StartCountStride(elem, (22, 25, 1), ['x', 'y', 'time'], grp, (22,25), put=True)
assert_equal(start[0][0][0], [0, 0, 1])
assert_equal(count[0][0][0], (22, 25, 1))
assert_equal(take_ind[0][0][0], (slice(None), slice(None), -1))
elem=(slice(None), slice(None), slice(1, 4))
start, count, stride, take_ind = _StartCountStride(elem, (22,25,1),\
['x', 'y', 'time'], grp, (22,25,3), put=True)
assert_equal(start[0][0][0], [0, 0, 1])
assert_equal(count[0][0][0], (22, 25, 3))
assert_equal(take_ind[0][0][0], (slice(None), slice(None), slice(None)))
def test_integer(self):
grp = FakeGroup({'x':False, 'y':False})
elem=([0,4,5], slice(20, None))
start, count, stride, take_ind = _StartCountStride(elem, (22, 25), ['x', 'y'], grp, (3,5), put=True)
assert_equal(start[0][0], (0, 20))
assert_equal(start[1][0], (4, 20))
assert_equal(start[2][0], (5, 20))
assert_equal(count[0], np.array([[1,5],]))
assert_equal(stride[0][0], (1, 1))
assert_equal(take_ind[0][0], (0, slice(None)))
assert_equal(take_ind[1][0], (1, slice(None)))
assert_equal(take_ind[2][0], (2, slice(None)))
def test_booleans(self):
grp = FakeGroup({'x':False, 'y':False, 'z':False})
elem=([0,4,5], np.array([False, True, False, True, True]), slice(None))
start, count, stride, take_ind = _StartCountStride(elem, (10, 5, 12), ['x', 'y', 'z'], grp, (3, 3, 12), put=True)
assert_equal(start[0][0][0], (0, 1, 0))
assert_equal(start[1][0][0], (4, 1, 0))
assert_equal(start[2][0][0], (5, 1, 0))
assert_equal(start[0][1][0], (0, 3, 0))
assert_equal(count[0][0][0], (1, 1, 12))
assert_equal(stride[0][0][0], (1, 1, 1))
assert_equal(take_ind[0][0][0], (0, 0, slice(None)))
assert_equal(take_ind[1][0][0], (1, 0, slice(None)))
assert_equal(take_ind[0][1][0], (0, 1, slice(None)))
def test_unlim(self):
grp = FakeGroup({'time':True,'x':False, 'y':False})
elem = ([0,2,5], slice(None), slice(None))
start, count, stride, take_ind = _StartCountStride(elem, (0, 6, 7),\
['time', 'x', 'y'], grp, (3, 6, 7), put=True)
assert_equal(start[0][0][0], (0, 0, 0))
assert_equal(start[2][0][0], (5, 0, 0))
assert_equal(count[2][0][0], (1, 6, 7))
assert_equal(take_ind[0][0][0], (0, slice(None), slice(None)))
assert_equal(take_ind[2][0][0], (2, slice(None), slice(None)))
# pull request #683 broke this, since _StartCountStride now uses
# Dimension.__len__.
#elem = (slice(None, None, 2), slice(None), slice(None))
#start, count, stride, take_ind = _StartCountStride(elem, (0, 6, 7),\
# ['time', 'x', 'y'], grp, (10, 6, 7),put=True)
#assert_equal(start[0][0][0], (0,0,0))
#assert_equal(count[0][0][0], (5, 6, 7))
#assert_equal(stride[0][0][0], (2, 1, 1))
#assert_equal(take_ind[0][0][0], 3*(slice(None),))
def test_ellipsis(self):
grp = FakeGroup({'x':False, 'y':False, 'time':True})
elem=(Ellipsis, slice(1, 4))
start, count, stride, take_ind = _StartCountStride(elem, (22,25,1),\
['x', 'y', 'time'], grp, (22,25,3), put=True)
assert_equal(start[0,0,0], [0, 0, 1])
assert_equal(count[0,0,0], (22, 25, 3))
assert_equal(take_ind[0,0,0], (slice(None), slice(None), slice(None)))
grp = FakeGroup({'time':True, 'h':False, 'z':False, 'y':False, 'x':False})
elem=(Ellipsis, [15,16,17,18,19], slice(None), slice(None))
start, count, stride, take_ind = _StartCountStride(elem, (2,10,20,10,10),\
['time', 'h', 'z', 'y', 'x'], grp, (2,10,5,10,10), put=True)
assert_equal(start[0,0,0,0,0], [0, 0, 15, 0, 0])
assert_equal(count[0,0,0,0,0], [2, 10, 5, 10, 10])
assert_equal(stride[0,0,0,0,0], [1, 1, 1, 1, 1])
assert_equal(take_ind[0,0,0,0,0], (slice(None), slice(None), slice(None), slice(None), slice(None)))
try:
elem=(Ellipsis, [15,16,17,18,19], slice(None))
start, count, stride, take_ind = _StartCountStride(elem, (2,10,20,10,10),\
['time', 'z', 'y', 'x'], grp, (2,10,5,10,10), put=True)
assert_equal(None, 'Should throw an exception')
except IndexError as e:
assert_equal(str(e), "integer index exceeds dimension size")
try:
elem=(Ellipsis, [15,16,17,18,19], Ellipsis)
start, count, stride, take_ind = _StartCountStride(elem, (2,10, 20,10,10),\
['time', 'z', 'y', 'x'], grp, (2,10,5,10,10), put=True)
assert_equal(None, 'Should throw an exception')
except IndexError as e:
assert_equal(str(e), "At most one ellipsis allowed in a slicing expression")
class FakeGroup(object):
"""Create a fake group instance by passing a dictionary of booleans
keyed by dimension name."""
def __init__(self, dimensions):
self.dimensions = {}
for k,v in dimensions.items():
self.dimensions[k] = FakeDimension(v)
class FakeDimension(object):
def __init__(self, unlimited=False):
self.unlimited = unlimited
def isunlimited(self):
return self.unlimited
if __name__=='__main__':
unittest.main()