abydos.distance._chebyshev

Complexity

Total Complexity

4

Size/Duplication

Total Lines	164
Duplicated Lines	0 %

Test Coverage

Coverage

84.62%

Importance

Changes

0

3 Methods

Rating	Name	Duplication	Size	Complexity
A	Chebyshev.dist_abs()	0	38	1
A	Chebyshev.dist()	0	17	1
A	Chebyshev.sim()	0	17	1

# -*- coding: utf-8 -*-

# Copyright 2018 by Christopher C. Little.
# This file is part of Abydos.
#
# Abydos is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Abydos is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Abydos. If not, see <http://www.gnu.org/licenses/>.

"""abydos.distance._chebyshev.

Chebyshev distance
"""

from __future__ import (
    absolute_import,
    division,
    print_function,
    unicode_literals,
)

from ._minkowski import Minkowski

__all__ = ['Chebyshev', 'chebyshev']


class Chebyshev(Minkowski):

The variable __class__ seems to be unused.

    r"""Chebyshev distance.

    Euclidean distance is the chessboard distance,
    equivalent to Minkowski distance in :math:`L^\infty`-space.
    """

    def dist_abs(self, src, tar, qval=2, alphabet=None):

Parameters differ from overridden 'dist_abs' method

        r"""Return the Chebyshev distance between two strings.

        Parameters
        ----------
        src : str
            Source string (or QGrams/Counter objects) for comparison
        tar : str
            Target string (or QGrams/Counter objects) for comparison
        qval : int
            The length of each q-gram; 0 for non-q-gram version alphabet
        alphabet : collection or int
            The values or size of the alphabet

        Returns
        -------
        float
            The Chebyshev distance

        Examples
        --------
        >>> cmp = Chebyshev()
        >>> cmp.dist_abs('cat', 'hat')
        1.0
        >>> cmp.dist_abs('Niall', 'Neil')
        1.0
        >>> cmp.dist_abs('Colin', 'Cuilen')
        1.0
        >>> cmp.dist_abs('ATCG', 'TAGC')
        1.0
        >>> cmp.dist_abs('ATCG', 'TAGC', qval=1)
        0.0
        >>> cmp.dist_abs('ATCGATTCGGAATTTC', 'TAGCATAATCGCCG', qval=1)
        3.0

        """
        return super(self.__class__, self).dist_abs(

The first argument passed to super() should be the super-class name, but self.__class__ was given.

            src, tar, qval, float('inf'), False, alphabet
        )

    def sim(self, *args, **kwargs):

Parameters differ from overridden 'sim' method

        """Raise exception when called.

        Parameters
        ----------
        *args
            Variable length argument list
        **kwargs
            Arbitrary keyword arguments

        Raises
        ------
        NotImplementedError
            Method disabled for Chebyshev distance

        """
        raise NotImplementedError('Method disabled for Chebyshev distance.')

    def dist(self, *args, **kwargs):

Parameters differ from overridden 'dist' method

        """Raise exception when called.

        Parameters
        ----------
        *args
            Variable length argument list
        **kwargs
            Arbitrary keyword arguments

        Raises
        ------
        NotImplementedError
            Method disabled for Chebyshev distance

        """
        raise NotImplementedError('Method disabled for Chebyshev distance.')


def chebyshev(src, tar, qval=2, alphabet=None):
    r"""Return the Chebyshev distance between two strings.

    This is a wrapper for the :py:meth:`Chebyshev.dist_abs`.

    Parameters
    ----------
    src : str
        Source string (or QGrams/Counter objects) for comparison
    tar : str
        Target string (or QGrams/Counter objects) for comparison
    qval : int
        The length of each q-gram; 0 for non-q-gram version alphabet
    alphabet : collection or int
        The values or size of the alphabet

    Returns
    -------
    float
        The Chebyshev distance

    Examples
    --------
    >>> chebyshev('cat', 'hat')
    1.0
    >>> chebyshev('Niall', 'Neil')
    1.0
    >>> chebyshev('Colin', 'Cuilen')
    1.0
    >>> chebyshev('ATCG', 'TAGC')
    1.0
    >>> chebyshev('ATCG', 'TAGC', qval=1)
    0.0
    >>> chebyshev('ATCGATTCGGAATTTC', 'TAGCATAATCGCCG', qval=1)
    3.0

    """
    return Chebyshev().dist_abs(src, tar, qval, alphabet)


if __name__ == '__main__':
    import doctest

    doctest.testmod()