mirror of
https://github.com/KevinMidboe/python-gpiozero.git
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83fb6ae8b4
Implements support for the HC-SR04 ultrasonic sensor as an input device class named DistanceSensor
54 lines
1.2 KiB
Python
54 lines
1.2 KiB
Python
# vim: set fileencoding=utf-8:
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from __future__ import (
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unicode_literals,
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absolute_import,
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print_function,
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division,
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)
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str = type('')
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import cmath
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# Back-ported from python 3.5; see
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# github.com/PythonCHB/close_pep/blob/master/is_close.py for original
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# implementation
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def isclose(a, b, rel_tol=1e-9, abs_tol=0.0):
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if rel_tol < 0.0 or abs_tol < 0.0:
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raise ValueError('error tolerances must be non-negative')
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if a == b: # fast-path for exact equality
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return True
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if cmath.isinf(a) or cmath.isinf(b):
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return False
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diff = abs(b - a)
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return (
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(diff <= abs(rel_tol * b)) or
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(diff <= abs(rel_tol * a)) or
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(diff <= abs_tol)
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)
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# Backported from py3.4
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def mean(data):
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if iter(data) is data:
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data = list(data)
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n = len(data)
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if not n:
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raise ValueError('cannot calculate mean of empty data')
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return sum(data) / n
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# Backported from py3.4
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def median(data):
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data = sorted(data)
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n = len(data)
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if not n:
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raise ValueError('cannot calculate median of empty data')
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elif n % 2:
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return data[n // 2]
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else:
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i = n // 2
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return (data[n - 1] + data[n]) / 2
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