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- from sympy.combinatorics.graycode import (GrayCode, bin_to_gray,
- random_bitstring, get_subset_from_bitstring, graycode_subsets,
- gray_to_bin)
- from sympy.testing.pytest import raises
- def test_graycode():
- g = GrayCode(2)
- got = []
- for i in g.generate_gray():
- if i.startswith('0'):
- g.skip()
- got.append(i)
- assert got == '00 11 10'.split()
- a = GrayCode(6)
- assert a.current == '0'*6
- assert a.rank == 0
- assert len(list(a.generate_gray())) == 64
- codes = ['011001', '011011', '011010',
- '011110', '011111', '011101', '011100', '010100', '010101', '010111',
- '010110', '010010', '010011', '010001', '010000', '110000', '110001',
- '110011', '110010', '110110', '110111', '110101', '110100', '111100',
- '111101', '111111', '111110', '111010', '111011', '111001', '111000',
- '101000', '101001', '101011', '101010', '101110', '101111', '101101',
- '101100', '100100', '100101', '100111', '100110', '100010', '100011',
- '100001', '100000']
- assert list(a.generate_gray(start='011001')) == codes
- assert list(
- a.generate_gray(rank=GrayCode(6, start='011001').rank)) == codes
- assert a.next().current == '000001'
- assert a.next(2).current == '000011'
- assert a.next(-1).current == '100000'
- a = GrayCode(5, start='10010')
- assert a.rank == 28
- a = GrayCode(6, start='101000')
- assert a.rank == 48
- assert GrayCode(6, rank=4).current == '000110'
- assert GrayCode(6, rank=4).rank == 4
- assert [GrayCode(4, start=s).rank for s in
- GrayCode(4).generate_gray()] == [0, 1, 2, 3, 4, 5, 6, 7, 8,
- 9, 10, 11, 12, 13, 14, 15]
- a = GrayCode(15, rank=15)
- assert a.current == '000000000001000'
- assert bin_to_gray('111') == '100'
- a = random_bitstring(5)
- assert type(a) is str
- assert len(a) == 5
- assert all(i in ['0', '1'] for i in a)
- assert get_subset_from_bitstring(
- ['a', 'b', 'c', 'd'], '0011') == ['c', 'd']
- assert get_subset_from_bitstring('abcd', '1001') == ['a', 'd']
- assert list(graycode_subsets(['a', 'b', 'c'])) == \
- [[], ['c'], ['b', 'c'], ['b'], ['a', 'b'], ['a', 'b', 'c'],
- ['a', 'c'], ['a']]
- raises(ValueError, lambda: GrayCode(0))
- raises(ValueError, lambda: GrayCode(2.2))
- raises(ValueError, lambda: GrayCode(2, start=[1, 1, 0]))
- raises(ValueError, lambda: GrayCode(2, rank=2.5))
- raises(ValueError, lambda: get_subset_from_bitstring(['c', 'a', 'c'], '1100'))
- raises(ValueError, lambda: list(GrayCode(3).generate_gray(start="1111")))
- def test_live_issue_117():
- assert bin_to_gray('0100') == '0110'
- assert bin_to_gray('0101') == '0111'
- for bits in ('0100', '0101'):
- assert gray_to_bin(bin_to_gray(bits)) == bits
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