def testComparisonMethods(self):
v1 = vtk.vtkVariant(10)
v2 = vtk.vtkVariant("10")
# compare without regards to type
self.assertEqual(vtk.vtkVariantEqual(v1, v2), True)
self.assertEqual(vtk.vtkVariantLessThan(v1, v2), False)
# compare with different types being non-equivalent
self.assertEqual(vtk.vtkVariantStrictEquality(v1, v2), False)
if sys.hexversion >= 0x03000000:
self.assertEqual(vtk.vtkVariantStrictWeakOrder(v1, v2), True)
else:
# for Python 2, it worked like the cmp() function
self.assertEqual(vtk.vtkVariantStrictWeakOrder(v1, v2), -1)
def testComparisonMethods(self):
v1 = vtk.vtkVariant(10)
v2 = vtk.vtkVariant("10")
# compare without regards to type
self.assertEqual(vtk.vtkVariantEqual(v1, v2), True)
self.assertEqual(vtk.vtkVariantLessThan(v1, v2), False)
# compare with different types being non-equivalent
self.assertEqual(vtk.vtkVariantStrictEquality(v1, v2), False)
if sys.hexversion >= 0x03000000:
self.assertEqual(vtk.vtkVariantStrictWeakOrder(v1, v2), True)
else:
# for Python 2, it worked like the cmp() function
self.assertEqual(vtk.vtkVariantStrictWeakOrder(v1, v2), -1)
print("Valid cast result: %r" % i)
# A failed cast returns None
v = vtk.vtkVariant("hello")
i = vtk.vtkVariantCast(v, 'int')
print("Invalid cast result: %r" % i)
#
# Comparisons and sorting: See VTK docs for more info
#
# Special function vtk.vtkVariantStrictWeakOrder:
# Compare variants by type first, and then by value. The return values
# are -1, 0, 1 like the python cmp() method, for compatibility with the
# python list sort() method. This is in contrast with the C++ version,
# which returns true or false.
v1 = vtk.vtkVariant(10)
v2 = vtk.vtkVariant("10")
i = vtk.vtkVariantStrictWeakOrder(v1, v2)
print("Strict weak order (10, '10') -> %i" % i)
# Check two variants for strict equality of type and value.
b = vtk.vtkVariantStrictEquality(v1, v2)
print("Strict equality (10, '10') -> %s" % b)
# Two special-purpose methods, not generally useful in python
# First is identical to (v1 < v2)
b = vtk.vtkVariantLessThan(v1, v2)
# Second is identical to (v1 == v2)
b = vtk.vtkVariantEqual(v1, v2)
#
# Comparisons and sorting: See VTK docs for more info
#
# Special function vtk.vtkVariantStrictWeakOrder:
# Compare variants by type first, and then by value. For Python 2, the
# return values are -1, 0, 1 like the Python 2 "cmp()" method. This is
# in contrast with the Python 3 and C++ versions of this function, which
# check if (v1 < v2) and return True or False.
v1 = vtk.vtkVariant(10)
v2 = vtk.vtkVariant("10")
r = vtk.vtkVariantStrictWeakOrder(v1, v2)
print("Strict weak order (10, '10') ->", r)
# Sorting by strict weak order, using a key function:
unsorted = [1, 2.5, vtk.vtkVariant(), "0", unicodeEtre]
l = [vtk.vtkVariant(x) for x in unsorted]
l.sort(key=vtk.vtkVariantStrictWeakOrderKey)
print("Sort by weak order ->", l)
# Check two variants for strict equality of type and value.
b = vtk.vtkVariantStrictEquality(v1, v2)
print("Strict equality (10, '10') -> %s" % b)
# Two special-purpose methods.
# First is identical to (v1 < v2)
b = vtk.vtkVariantLessThan(v1, v2)
# Second is identical to (v1 == v2)
b = vtk.vtkVariantEqual(v1, v2)
