/usr/lib/python2.7/dist-packages/pint/measurement.py is in python-pint 0.6-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 | # -*- coding: utf-8 -*-
"""
pint.measurement
~~~~~~~~~~~~~~~~
:copyright: 2013 by Pint Authors, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import division, unicode_literals, print_function, absolute_import
from .compat import ufloat
from .formatting import _FORMATS
MISSING = object()
class _Measurement(object):
"""Implements a class to describe a quantity with uncertainty.
:param value: The most likely value of the measurement.
:type value: Quantity or Number
:param error: The error or uncertainty of the measurement.
:type error: Quantity or Number
"""
def __new__(cls, value, error, units=MISSING):
if units is MISSING:
try:
value, units = value.magnitude, value.units
except AttributeError:
try:
value, error, units = value.nominal_value, value.std_dev, error
except AttributeError:
units = ''
try:
error = error.to(units).magnitude
except AttributeError:
pass
inst = super(_Measurement, cls).__new__(cls, ufloat(value, error), units)
if error < 0:
raise ValueError('The magnitude of the error cannot be negative'.format(value, error))
return inst
@property
def value(self):
return self._REGISTRY.Quantity(self.magnitude.nominal_value, self.units)
@property
def error(self):
return self._REGISTRY.Quantity(self.magnitude.std_dev, self.units)
@property
def rel(self):
return float(abs(self.magnitude.std_dev / self.magnitude.nominal_value))
def __repr__(self):
return "<Measurement({0:.2f}, {1:.2f}, {2})>".format(self.magnitude.nominal_value,
self.magnitude.std_dev,
self.units)
def __str__(self):
return '{0}'.format(self)
def __format__(self, spec):
if 'L' in spec:
newpm = pm = r' \pm '
pars = _FORMATS['L']['parentheses_fmt']
elif 'P' in spec:
newpm = pm = '±'
pars = _FORMATS['P']['parentheses_fmt']
else:
newpm = pm = '+/-'
pars = _FORMATS['']['parentheses_fmt']
if 'C' in spec:
sp = ''
newspec = spec.replace('C', '')
pars = _FORMATS['C']['parentheses_fmt']
else:
sp = ' '
newspec = spec
if 'H' in spec:
newpm = '±'
newspec = spec.replace('H', '')
pars = _FORMATS['H']['parentheses_fmt']
mag = format(self.magnitude, newspec).replace(pm, sp + newpm + sp)
if 'L' in newspec and 'S' in newspec:
mag = mag.replace('(', r'\left(').replace(')', r'\right)')
if 'uS' in newspec or 'ue' in newspec or 'u%' in newspec:
return mag + ' ' + format(self.units, spec)
else:
return pars.format(mag) + ' ' + format(self.units, spec)
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