def is_cyclic(self):
"""
Whether the composition has a cyclic part end.
(Returns False if it's a single-part composition).
"""
if self._is_cyclic is None:
# Rows don't have an is_cyclic method (why not?)
# Generate all cyclic part ends and see if ours is one of them.
if self.is_treble_fixed:
cyclic_part_ends = [
Row.cyclic(self.configs.bells, 1, n)
for n in range(self.configs.bells - 1)
]
else:
cyclic_part_ends = [
Row.cyclic(self.configs.bells, 0, n)
for n in range(self.configs.bells)
]
self._is_cyclic = self.part_end in cyclic_part_ends
return self.parts != 1 and self._is_cyclic
def test_row_cyclic(self):
self.assertEqual(Row.cyclic(0), Row())
self.assertEqual(Row.cyclic(1), Row('1'))
self.assertEqual(Row.cyclic(2), Row('12'))
self.assertEqual(Row.cyclic(3), Row('132'))
self.assertEqual(Row.cyclic(5), Row('13452'))
self.assertEqual(Row.cyclic(8), Row('13456782'))
self.assertEqual(Row.cyclic(3, 0), Row('231'))
self.assertEqual(Row.cyclic(3, 2), Row('123'))
self.assertEqual(Row.cyclic(3, 3), Row('123'))
self.assertEqual(Row.cyclic(3, 9), Row('123'))
self.assertEqual(Row.cyclic(8, 0), Row('23456781'))
self.assertEqual(Row.cyclic(8, 2), Row('12456783'))
self.assertEqual(Row.cyclic(9, 2), Row('124567893'))
self.assertEqual(Row.cyclic(8, 1, -1), Row('18234567'))
self.assertEqual(Row.cyclic(8, 1, 0), Row('12345678'))
self.assertEqual(Row.cyclic(8, 1, 2), Row('14567823'))
self.assertEqual(Row.cyclic(8, 1, 5), Row('17823456'))
self.assertEqual(Row.cyclic(8, 1, 7), Row('12345678'))
self.assertEqual(Row.cyclic(8, 1, 13), Row('18234567'))
