Repository navigation
Expand file tree
/
Copy pathunitquantity.py
More file actions
502 lines (384 loc) · 12.9 KB
/
Copy pathunitquantity.py
File metadata and controls
502 lines (384 loc) · 12.9 KB
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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
"""
"""
import weakref
import numpy
from .dimensionality import Dimensionality
from . import markup
from .quantity import Quantity, get_conversion_factor
from .registry import unit_registry
from .decorators import memoize, with_doc
__all__ = [
'CompoundUnit', 'Dimensionless', 'UnitConstant', 'UnitCurrency',
'UnitCurrent', 'UnitInformation', 'UnitLength', 'UnitLuminousIntensity',
'UnitMass', 'UnitMass', 'UnitQuantity', 'UnitSubstance', 'UnitTemperature',
'UnitTime', 'set_default_units'
]
class UnitQuantity(Quantity):
_primary_order = 90
_secondary_order = 0
_reference_quantity = None
__array_priority__ = 20
def __new__(
cls, name, definition=None, symbol=None, u_symbol=None,
aliases=[], doc=None
):
try:
assert isinstance(name, str)
except AssertionError:
raise TypeError('name must be a string, got %s (not unicode)'%name)
try:
assert symbol is None or isinstance(symbol, str)
except AssertionError:
raise TypeError(
'symbol must be a string, '
'got %s (u_symbol can be unicode)'%symbol
)
ret = numpy.array(1, dtype='d').view(cls)
ret.flags.writeable = False
ret._name = name
ret._symbol = symbol
ret._u_symbol = u_symbol
if doc is not None:
ret.__doc__ = doc
if definition is not None:
if not isinstance(definition, Quantity):
definition *= dimensionless
ret._definition = definition
ret._conv_ref = definition._reference
else:
ret._definition = None
ret._conv_ref = None
ret._aliases = aliases
ret._format_order = (ret._primary_order, ret._secondary_order)
ret.__class__._secondary_order += 1
return ret
def __init__(
self, name, definition=None, symbol=None, u_symbol=None,
aliases=[], doc=None
):
unit_registry[name] = self
if symbol:
unit_registry[symbol] = self
for alias in aliases:
unit_registry[alias] = self
def __array_finalize__(self, obj):
pass
def __hash__(self):
return hash((type(self), self._name))
@property
def _reference(self):
if self._conv_ref is None:
return self
else:
return self._conv_ref
@property
def _dimensionality(self):
return Dimensionality({self:1})
@property
def format_order(self):
return self._format_order
@property
def name(self):
return self._name
@property
def definition(self):
if self._definition is None:
return self
else:
return self._definition
@property
def simplified(self):
return self._reference.simplified
@property
def symbol(self):
if self._symbol:
return self._symbol
else:
return self.name
@property
def u_symbol(self):
if self._u_symbol:
return self._u_symbol
else:
return self.symbol
@property
def units(self):
return self
@units.setter
def units(self, units):
raise AttributeError('can not modify protected units')
def __repr__(self):
ref = self._definition
if ref:
ref = ', %s * %s'%(str(ref.magnitude), ref.dimensionality.string)
else:
ref = ''
symbol = self._symbol
symbol = ', %s'%(repr(symbol)) if symbol else ''
if markup.config.use_unicode:
u_symbol = self._u_symbol
u_symbol = ', %s'%(repr(u_symbol)) if u_symbol else ''
else:
u_symbol = ''
return '%s(%s%s%s%s)'%(
self.__class__.__name__, repr(self.name), ref, symbol, u_symbol
)
@with_doc(Quantity.__str__, use_header=False)
def __str__(self):
if self.u_symbol != self.name:
if markup.config.use_unicode:
s = '1 %s (%s)'%(self.u_symbol, self.name)
else:
s = '1 %s (%s)'%(self.symbol, self.name)
else:
s = '1 %s'%self.name
return s
@with_doc(Quantity.__add__, use_header=False)
def __add__(self, other):
return self.view(Quantity).__add__(other)
@with_doc(Quantity.__radd__, use_header=False)
def __radd__(self, other):
try:
return self.rescale(other.units).__radd__(other)
except AttributeError:
return self.view(Quantity).__radd__(other)
@with_doc(Quantity.__sub__, use_header=False)
def __sub__(self, other):
return self.view(Quantity).__sub__(other)
@with_doc(Quantity.__rsub__, use_header=False)
def __rsub__(self, other):
try:
return self.rescale(other.units).__rsub__(other)
except AttributeError:
return self.view(Quantity).__rsub__(other)
@with_doc(Quantity.__mod__, use_header=False)
def __mod__(self, other):
return self.view(Quantity).__mod__(other)
@with_doc(Quantity.__rsub__, use_header=False)
def __rmod__(self, other):
try:
return self.rescale(other.units).__rmod__(other)
except AttributeError:
return self.view(Quantity).__rmod__(other)
@with_doc(Quantity.__mul__, use_header=False)
def __mul__(self, other):
return self.view(Quantity).__mul__(other)
@with_doc(Quantity.__rmul__, use_header=False)
def __rmul__(self, other):
return self.view(Quantity).__rmul__(other)
@with_doc(Quantity.__truediv__, use_header=False)
def __truediv__(self, other):
return self.view(Quantity).__truediv__(other)
@with_doc(Quantity.__rtruediv__, use_header=False)
def __rtruediv__(self, other):
return self.view(Quantity).__rtruediv__(other)
@with_doc(Quantity.__pow__, use_header=False)
def __pow__(self, other):
return self.view(Quantity).__pow__(other)
@with_doc(Quantity.__rpow__, use_header=False)
def __rpow__(self, other):
return self.view(Quantity).__rpow__(other)
@with_doc(Quantity.__iadd__, use_header=False)
def __iadd__(self, other):
raise TypeError('can not modify protected units')
@with_doc(Quantity.__isub__, use_header=False)
def __isub__(self, other):
raise TypeError('can not modify protected units')
@with_doc(Quantity.__imul__, use_header=False)
def __imul__(self, other):
raise TypeError('can not modify protected units')
@with_doc(Quantity.__itruediv__, use_header=False)
def __itruediv__(self, other):
raise TypeError('can not modify protected units')
@with_doc(Quantity.__ipow__, use_header=False)
def __ipow__(self, other):
raise TypeError('can not modify protected units')
def __getstate__(self):
"""
Return the internal state of the quantity, for pickling
purposes.
"""
state = (1, self._format_order)
return state
def __setstate__(self, state):
ver, fo = state
self._format_order = fo
def __reduce__(self):
"""
Return a tuple for pickling a UnitQuantity.
"""
return (
type(self),
(
self._name,
self._definition,
self._symbol,
self._u_symbol,
self._aliases,
self.__doc__
),
self.__getstate__()
)
def copy(self):
return (
type(self)(
self._name,
self._definition,
self._symbol,
self._u_symbol,
self._aliases,
self.__doc__
)
)
unit_registry['UnitQuantity'] = UnitQuantity
class IrreducibleUnit(UnitQuantity):
_default_unit = None
def __init__(
self, name, definition=None, symbol=None, u_symbol=None,
aliases=[], doc=None
):
super().__init__(
name, definition, symbol, u_symbol, aliases, doc
)
cls = type(self)
if cls._default_unit is None:
cls._default_unit = self
@property
def simplified(self):
return self.view(Quantity).rescale(self.get_default_unit())
@classmethod
def get_default_unit(cls):
return cls._default_unit
@classmethod
def set_default_unit(cls, unit):
if unit is None:
return
if isinstance(unit, str):
unit = unit_registry[unit]
try:
# check that conversions are possible:
get_conversion_factor(cls._default_unit, unit)
except ValueError:
raise TypeError('default unit must be of same type')
cls._default_unit = unit
class UnitMass(IrreducibleUnit):
_primary_order = 1
class UnitLength(IrreducibleUnit):
_primary_order = 2
class UnitTime(IrreducibleUnit):
_primary_order = 3
class UnitCurrent(IrreducibleUnit):
_primary_order = 4
class UnitLuminousIntensity(IrreducibleUnit):
_primary_order = 5
class UnitSubstance(IrreducibleUnit):
_primary_order = 6
class UnitTemperature(IrreducibleUnit):
_primary_order = 7
class UnitInformation(IrreducibleUnit):
_primary_order = 8
class UnitCurrency(IrreducibleUnit):
_primary_order = 9
class CompoundUnit(UnitQuantity):
_primary_order = 99
def __new__(cls, name):
return UnitQuantity.__new__(cls, name, unit_registry[name])
def __init__(self, name):
# do not register
return
@with_doc(UnitQuantity.__add__, use_header=False)
def __repr__(self):
return '1 %s'%self.name
@property
def name(self):
if markup.config.use_unicode:
return '(%s)'%(markup.superscript(self._name))
else:
return '(%s)'%self._name
def __reduce__(self):
"""
Return a tuple for pickling a UnitQuantity.
"""
return (
type(self),
(self._name, ),
self.__getstate__()
)
def copy(self):
return type(self)(self._name)
unit_registry['CompoundUnit'] = CompoundUnit
class Dimensionless(UnitQuantity):
_primary_order = 100
def __init__(self, name, definition=None):
self._name = name
if definition is None:
definition = self
self._definition = definition
self._format_order = (self._primary_order, self._secondary_order)
self.__class__._secondary_order += 1
unit_registry[name] = self
def __reduce__(self):
"""
Return a tuple for pickling a UnitQuantity.
"""
return (
type(self),
(
self._name,
),
self.__getstate__()
)
@property
def _dimensionality(self):
return Dimensionality()
dimensionless = Dimensionless('dimensionless')
class UnitConstant(UnitQuantity):
_primary_order = 0
def __init__(
self, name, definition=None, symbol=None, u_symbol=None,
aliases=[], doc=None
):
# we dont want to register constants in the unit registry
return
def set_default_units(
system=None, currency=None, current=None, information=None, length=None,
luminous_intensity=None, mass=None, substance=None, temperature=None,
time=None
):
"""
Set the default units in which simplified quantities will be
expressed.
system sets the unit system, and can be "SI" or "cgs". All other
keyword arguments will accept either a string or a unit quantity.
An error will be raised if it is not possible to convert between
old and new defaults, so it is not possible to set "kg" as the
default unit for time.
If both system and individual defaults are given, the system
defaults will be applied first, followed by the individual ones.
"""
if system is not None:
system = system.lower()
try:
assert system in ('si', 'cgs')
except AssertionError:
raise ValueError('system must be "SI" or "cgs", got "%s"' % system)
if system == 'si':
UnitCurrent.set_default_unit('A')
UnitLength.set_default_unit('m')
UnitMass.set_default_unit('kg')
elif system == 'cgs':
UnitLength.set_default_unit('cm')
UnitMass.set_default_unit('g')
UnitLuminousIntensity.set_default_unit('cd')
UnitSubstance.set_default_unit('mol')
UnitTemperature.set_default_unit('degK')
UnitTime.set_default_unit('s')
UnitCurrency.set_default_unit(currency)
UnitCurrent.set_default_unit(current)
UnitInformation.set_default_unit(information)
UnitLength.set_default_unit(length)
UnitLuminousIntensity.set_default_unit(luminous_intensity)
UnitMass.set_default_unit(mass)
UnitSubstance.set_default_unit(substance)
UnitTemperature.set_default_unit(temperature)
UnitTime.set_default_unit(time)