import iris
import numpy as np
iris.__version__

points = np.arange(11)
bounds = np.array(([(x-2, x+2) for x in points]))
example_coord = iris.coords.AuxCoord(points, bounds=bounds, long_name='example')
print example_coord

value = 5
for cell in example_coord.cells():
    print('{!r} == {!r} is {}'.format(cell, value, cell==value))

for cell in example_coord.cells():
    print('{!r} == {!r} is {}'.format(cell.point, value, cell.point==value))

example_coord = iris.coords.DimCoord(points, bounds=bounds, long_name='example')
dummy_cube = iris.cube.Cube(np.random.random(11))
dummy_cube.add_dim_coord(example_coord, 0)

cell_comparison_constraint = iris.Constraint(example=lambda cell: cell == 5)
cell_point_comparison_constraint = iris.Constraint(example=lambda cell: cell.point == 5)

print dummy_cube.extract(cell_comparison_constraint).coords()
print dummy_cube.extract(cell_point_comparison_constraint).coords()