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# vim: set et sw=4 sts=4 fileencoding=utf-8:
#
# The colorzero color library
#
# Copyright (c) 2018 Dave Jones <dave@waveform.org.uk>
#
# SPDX-License-Identifier: BSD-3-Clause
import cmath
# Back-ported from python 3.5; see
# github.com/PythonCHB/close_pep/blob/master/is_close.py for original
# implementation
def isclose(a, b, rel_tol=1e-9, abs_tol=0.0):
if rel_tol < 0.0 or abs_tol < 0.0:
raise ValueError('error tolerances must be non-negative')
if a == b: # fast-path for exact equality
return True
if cmath.isinf(a) or cmath.isinf(b):
return False
diff = abs(b - a)
return (
(diff <= abs(rel_tol * b)) or
(diff <= abs(rel_tol * a)) or
(diff <= abs_tol)
)
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