1

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

3

4 u'''Floating point and other formatting utilities.

5'''

6

7 from pygeodesy.basics import isint, islistuple, isscalar, isstr, itemsorted, \

8 _zip, _0_0

9# from pygeodesy.constants import _0_0

10 from pygeodesy.errors import _AttributeError, _IsnotError, _or, _TypeError, \

11 _ValueError, _xkwds_get, _xkwds_pop2

12 from pygeodesy.interns import NN, _0_, _0to9_, MISSING, _BAR_, _COMMASPACE_, \

13 _DOT_, _dunder_nameof, _E_, _ELLIPSIS_, _EQUAL_, \

14 _H_, _LR_PAIRS, _N_, _name_, _not_, _not_scalar_, \

15 _PERCENT_, _SPACE_, _STAR_, _UNDER_

16 from pygeodesy.interns import _convergence_, _distant_, _e_, _eps_, _exceeds_, \

17 _EQUALSPACED_, _f_, _F_, _g_, _limit_, _no_, \

18 _tolerance_ # PYCHOK used!

19 from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS, _getenv

20

21 from math import fabs, log10 as _log10

22

23__all__ = _ALL_LAZY.streprs

24__version__ = '24.02.20'

25

26_EN_PREC = 6 # max MGRS/OSGR precision, 1 micrometer

27_EN_WIDE = 5 # number of MGRS/OSGR units, log10(_100km)

28_OKd_ = '._-' # acceptable name characters

29_PAREN_g = '(%g)' # PYCHOK used!

30_threshold_ = 'threshold' # PYCHOK used!

31

32

33 class _Fmt(str): # in .streprs

34 '''(INTERNAL) Callable formatting.

35 '''

36 name = NN

37

38 def __call__(self, *name_value_, **name_value):

39 '''Format a C{name=value} pair or C{name, value} pair

40 or just a single C{value}.

41 '''

42 for n, v in name_value.items():

43 break

44 else:

45 if len(name_value_) > 1:

46 n, v = name_value_[:2]

47 elif name_value_:

48 n, v = NN, name_value_[0]

49 else:

50 n, v = NN, MISSING

51 t = str.__mod__(self, v)

52 return NN(n, t) if n else t

53

54# def __mod__(self, arg, **unused):

55# '''Regular C{%} operator.

56# '''

57# return str.__mod__(self, arg)

58

59

60 class Fstr(str):

61 '''(INTERNAL) C{float} format.

62 '''

63 name = NN

64

65 def __call__(self, flt, prec=None, ints=False):

66 '''Format the B{C{flt}} like function L{fstr}.

67 '''

68 # see also function C{fstr} if isscalar case below

69 t = str.__mod__(_pct(self), flt) if prec is None else next(

70 _streprs(prec, (flt,), self, ints, True, None))

71 return t

72

73 def __mod__(self, arg, **unused):

74 '''Regular C{%} operator.

75

76 @arg arg: A C{scalar} value to be formatted (either

77 the C{scalar}, or a 1-tuple C{(scalar,)},

78 or 2-tuple C{(prec, scalar)}.

79

80 @raise TypeError: Non-scalar B{C{arg}} value.

81

82 @raise ValueError: Invalid B{C{arg}}.

83 '''

84 def _error(arg):

85 n = _DOT_(Fstr.__name__, self.name or self)

86 return _SPACE_(n, _PERCENT_, repr(arg))

87

88 prec = 6 # default std %f and %F

89 if islistuple(arg):

90 n = len(arg)

91 if n == 1:

92 arg = arg[0]

93 elif n == 2:

94 prec, arg = arg

95 else:

96 raise _ValueError(_error(arg))

97

98 if not isscalar(arg):

99 raise _TypeError(_error(arg))

100 return self(arg, prec=prec)

101

102

103 class _Sub(str):

104 '''(INTERNAL) Class list formatter.

105 '''

106 # see .ellipsoidalNvector.LatLon.deltaTo

107 def __call__(self, *Classes):

108 t = _or(*(C.__name__ for C in Classes))

109 return str.__mod__(self, t or MISSING)

110

111

112 class Fmt(object):

113 '''Formatting options.

114 '''

115 ANGLE = _Fmt('<%s>')

116 COLON = _Fmt(':%s')

117# COLONSPACE = _Fmt(': %s') # == _COLONSPACE_(n, v)

118# COMMASPACE = _Fmt(', %s') # == _COMMASPACE_(n, v)

119 convergence = _Fmt(_convergence_(_PAREN_g))

120 CURLY = _Fmt('{%s}') # BRACES

121 distant = _Fmt(_distant_('(%.3g)'))

122 DOT = _Fmt('.%s') # == NN(_DOT_, n)

123 e = Fstr(_e_)

124 E = Fstr(_E_)

125 EQUAL = _Fmt(_EQUAL_(NN, '%s'))

126 EQUALg = _Fmt(_EQUAL_(NN, '%g'))

127 EQUALSPACED = _Fmt(_EQUALSPACED_(NN, '%s'))

128 exceeds_eps = _Fmt(_exceeds_(_eps_, _PAREN_g))

129 exceeds_limit = _Fmt(_exceeds_(_limit_, _PAREN_g))

130 f = Fstr(_f_)

131 form = _getenv('PYGEODESY_FMT_FORM', NN)

132 F = Fstr(_F_)

133 g = Fstr(_g_)

134 G = Fstr('G')

135 h = Fstr('%+.*f') # height, .streprs.hstr

136 limit = _Fmt(' %s limit') # .units

137 LOPEN = _Fmt('(%s]') # left-open range (L, R]

138 PAREN = _Fmt('(%s)')

139 PAREN_g = _Fmt(_PAREN_g)

140 PARENSPACED = _Fmt(' (%s)')

141 QUOTE2 = _Fmt('"%s"')

142 ROPEN = _Fmt('[%s)') # right-open range [L, R)

143# SPACE = _Fmt(' %s') # == _SPACE_(n, v)

144 SQUARE = _Fmt('[%s]') # BRACKETS

145 sub_class = _Sub('%s (sub-)class')

146 TAG = ANGLE

147 TAGEND = _Fmt('</%s>')

148 tolerance = _Fmt(_tolerance_(_PAREN_g))

149 zone = _Fmt('%02d') # .epsg, .mgrs, .utmupsBase

150

151 def __init__(self):

152 for n, a in self.__class__.__dict__.items():

153 if isinstance(a, (Fstr, _Fmt)):

154 setattr(a, _name_, n)

155

156 def __call__(self, obj, prec=9):

157 '''Return C{str(B{obj})} or C{repr(B{obj})}.

158 '''

159 return str(obj) if isint(obj) else next(

160 _streprs(prec, (obj,), Fmt.g, False, False, repr))

161

162 def INDEX(self, name, i=None):

163 return name if i is None else self.SQUARE(name, i)

164

165 def no_convergence(self, _d, *tol, **thresh):

166 t = Fmt.convergence(fabs(_d))

167 if tol:

168 t = _COMMASPACE_(t, Fmt.tolerance(tol[0]))

169 if thresh and _xkwds_get(thresh, thresh=False):

170 t = t.replace(_tolerance_, _threshold_)

171 return _no_(t)

172

173 Fmt = Fmt() # PYCHOK singleton

174 Fmt.__name__ = Fmt.__class__.__name__

175

176_DOTSTAR_ = Fmt.DOT(_STAR_)

177# formats %G and %g drop all trailing zeros and the

178# decimal point, making the float appear as an int

179_Gg = (Fmt.G, Fmt.g)

180_FfEeGg = (Fmt.F, Fmt.f, Fmt.E, Fmt.e) + _Gg # float formats

181_Fspec_ = NN('[%[<flags>][<width>]', _DOTSTAR_, ']', _BAR_.join(_FfEeGg)) # in testStreprs

182

183

184 def anstr(name, OKd=_OKd_, sub=_UNDER_):

185 '''Make a valid name of alphanumeric and OKd characters.

186

187 @arg name: The original name (C{str}).

188 @kwarg OKd: Other acceptable characters (C{str}).

189 @kwarg sub: Substitute for invalid charactes (C{str}).

190

191 @return: The modified name (C{str}).

192

193 @note: Leading and trailing whitespace characters are removed,

194 intermediate whitespace characters are coalesced and

195 substituted.

196 '''

197 s = n = str(name).strip()

198 for c in n:

199 if not (c.isalnum() or c in OKd or c in sub):

200 s = s.replace(c, _SPACE_)

201 return sub.join(s.strip().split())

202

203

204 def attrs(inst, *names, **Nones_True__pairs_kwds): # prec=6, fmt=Fmt.F, ints=False, Nones=True, sep=_EQUAL_

205 '''Get instance attributes as I{name=value} strings, with C{float}s

206 formatted by function L{fstr}.

207

208 @arg inst: The instance (any C{type}).

209 @arg names: The attribute names, all other positional (C{str}).

210 @kwarg Nones_True__pairs_kwds: Keyword argument for function L{pairs}, except

211 C{B{Nones}=True} to in-/exclude missing or C{None}-valued attributes.

212

213 @return: A C{tuple(B{sep}.join(t) for t in zip(B{names}, reprs(values, ...)))}

214 of C{str}s.

215 '''

216 def _items(inst, names, Nones):

217 for n in names:

218 v = getattr(inst, n, None)

219 if Nones or v is not None:

220 yield n, v

221

222 def _Nones_kwds(Nones=True, **kwds):

223 return Nones, kwds

224

225 Nones, kwds = _Nones_kwds(**Nones_True__pairs_kwds)

226 return pairs(_items(inst, names, Nones), **kwds)

227

228

229 def enstr2(easting, northing, prec, *extras, **wide_dot):

230 '''Return an MGRS/OSGR easting, northing string representations.

231

232 @arg easting: Easting from false easting (C{meter}).

233 @arg northing: Northing from from false northing (C{meter}).

234 @arg prec: Precision, the number of I{decimal} digits (C{int}) or if

235 negative, the number of I{units to drop}, like MGRS U{PRECISION

236 <https://GeographicLib.SourceForge.io/C++/doc/GeoConvert.1.html#PRECISION>}.

237 @arg extras: Optional leading items (C{str}s).

238 @kwarg wide_dot: Optional keword argument C{B{wide}=%d} for the number of I{unit digits}

239 (C{int}) and C{B{dot}=False} (C{bool}) to insert a decimal point.

240

241 @return: B{C{extras}} + 2-tuple C{(str(B{easting}), str(B{northing}))} or

242 + 2-tuple C{("", "")} for C{B{prec} <= -B{wide}}.

243

244 @raise ValueError: Invalid B{C{easting}}, B{C{northing}} or B{C{prec}}.

245

246 @note: The B{C{easting}} and B{C{northing}} values are I{truncated, not rounded}.

247 '''

248 t = extras

249 try: # like .dms.compassPoint

250 p = min(int(prec), _EN_PREC)

251 w = p + _xkwds_get(wide_dot, wide=_EN_WIDE)

252 if w > 0:

253 f = 10**p # truncate

254 d = (-p) if p > 0 and _xkwds_get(wide_dot, dot=False) else 0

255 t += (_0wdot(w, int(easting * f), d),

256 _0wdot(w, int(northing * f), d))

257 else: # prec <= -_EN_WIDE

258 t += (NN, NN)

259 except (TypeError, ValueError) as x:

260 raise _ValueError(easting=easting, northing=northing, prec=prec, cause=x)

261 return t

262

263 if enstr2.__doc__: # PYCHOK expected

264 enstr2.__doc__ %= (_EN_WIDE,)

265

266

267 def _enstr2m3(estr, nstr, wide=_EN_WIDE): # in .mgrs, .osgr

268 '''(INTERNAL) Convert east- and northing C{str}s to meter and resolution.

269 '''

270 def _s2m2(s, m): # e or n str to float meter

271 if _DOT_ in s:

272 m = 1 # meter

273 else:

274 s += _0_ * wide

275 s = _DOT_(s[:wide], s[wide:wide+_EN_PREC])

276 return float(s), m

277

278 e, m = _s2m2(estr, 0)

279 n, m = _s2m2(nstr, m)

280 if not m:

281 p = max(len(estr), len(nstr)) # 2 = Km, 5 = m, 7 = cm

282 m = 10**max(-_EN_PREC, wide - p) # resolution, meter

283 return e, n, m

284

285

286 def fstr(floats, prec=6, fmt=Fmt.F, ints=False, sep=_COMMASPACE_, strepr=None):

287 '''Convert one or more floats to string, optionally stripped of trailing zero decimals.

288

289 @arg floats: Single or a list, sequence, tuple, etc. (C{scalar}s).

290 @kwarg prec: The C{float} precision, number of decimal digits (0..9).

291 Trailing zero decimals are stripped if B{C{prec}} is

292 positive, but kept for negative B{C{prec}} values. In

293 addition, trailing decimal zeros are stripped for U{alternate,

294 form '#'<https://docs.Python.org/3/library/stdtypes.html

295 #printf-style-string-formatting>}.

296 @kwarg fmt: Optional C{float} format (C{letter}).

297 @kwarg ints: Optionally, remove the decimal dot for C{int} values (C{bool}).

298 @kwarg sep: Separator joining the B{C{floats}} (C{str}).

299 @kwarg strepr: Optional callable to format non-C{floats} (typically

300 C{repr}, C{str}) or C{None} to raise a TypeError.

301

302 @return: The C{sep.join(strs(floats, ...)} joined (C{str}) or single

303 C{strs((floats,), ...)} (C{str}) if B{C{floats}} is C{scalar}.

304 '''

305 if isscalar(floats): # see Fstr.__call__ above

306 return next(_streprs(prec, (floats,), fmt, ints, True, strepr))

307 else:

308 return sep.join(_streprs(prec, floats, fmt, ints, True, strepr))

309

310

311 def _fstrENH2(inst, prec, m, fmt=Fmt.F): # in .css, .lcc, .utmupsBase

312 # (INTERNAL) For C{Css.} and C{Lcc.} C{toRepr} and C{toStr} and C{UtmUpsBase._toStr}.

313 t = inst.easting, inst.northing

314 t = tuple(_streprs(prec, t, fmt, False, True, None))

315 T = _E_, _N_

316 if m is not None and fabs(inst.height): # fabs(self.height) > EPS

317 t += hstr(inst.height, prec=-2, m=m),

318 T += _H_,

319 return t, T

320

321

322 def _fstrLL0(inst, prec, toRepr): # in .azimuthal, .css

323 # (INTERNAL) For C{_AlbersBase.}, C{_AzimuthalBase.} and C{CassiniSoldner.}

324 t = tuple(_streprs(prec, inst.latlon0, Fmt.F, False, True, None))

325 if toRepr:

326 n = inst.name

327 if n:

328 t += Fmt.EQUAL(_name_, repr(n)),

329 t = Fmt.PAREN(inst.classname, _COMMASPACE_.join(t))

330 return t

331

332

333 def fstrzs(efstr, ap1z=False):

334 '''Strip trailing zero decimals from a C{float} string.

335

336 @arg efstr: Float with or without exponent (C{str}).

337 @kwarg ap1z: Append the decimal point and one zero decimal

338 if the B{C{efstr}} is all digits (C{bool}).

339

340 @return: Float (C{str}).

341 '''

342 s = efstr.find(_DOT_)

343 if s >= 0:

344 e = efstr.rfind(Fmt.e)

345 if e < 0:

346 e = efstr.rfind(Fmt.E)

347 if e < 0:

348 e = len(efstr)

349 s += 2 # keep 1st _DOT_ + _0_

350 if s < e and efstr[e-1] == _0_:

351 efstr = NN(efstr[:s], efstr[s:e].rstrip(_0_), efstr[e:])

352

353 elif ap1z:

354 # %.G and %.g formats may drop the decimal

355 # point and all trailing zeros, ...

356 if efstr.isdigit():

357 efstr += _DOT_ + _0_ # ... append or ...

358 else: # ... insert one dot and zero

359 e = efstr.rfind(Fmt.e)

360 if e < 0:

361 e = efstr.rfind(Fmt.E)

362 if e > 0:

363 efstr = NN(efstr[:e], _DOT_, _0_, efstr[e:])

364

365 return efstr

366

367

368 def hstr(height, prec=2, fmt=Fmt.h, ints=False, m=NN):

369 '''Return a string for the height value.

370

371 @arg height: Height value (C{float}).

372 @kwarg prec: The C{float} precision, number of decimal digits (0..9).

373 Trailing zero decimals are stripped if B{C{prec}} is

374 positive, but kept for negative B{C{prec}} values.

375 @kwarg fmt: Optional C{float} format (C{letter}).

376 @kwarg ints: Optionally, remove the decimal dot for C{int} values (C{bool}).

377 @kwarg m: Optional unit of the height (C{str}).

378 '''

379 h = next(_streprs(prec, (height,), fmt, ints, True, None))

380 return NN(h, str(m)) if m else h

381

382

383 def instr(inst, *args, **kwds):

384 '''Return the string representation of an instantiation.

385

386 @arg inst: The instance (any C{type}).

387 @arg args: Optional positional arguments.

388 @kwarg kwds: Optional keyword arguments.

389

390 @return: Representation (C{str}).

391 '''

392 return unstr(_MODS.named.classname(inst), *args, **kwds)

393

394

395 def lrstrip(txt, lrpairs=_LR_PAIRS):

396 '''Left- I{and} right-strip parentheses, brackets, etc. from a string.

397

398 @arg txt: String to be stripped (C{str}).

399 @kwarg lrpairs: Parentheses, etc. to remove (C{dict} of one or several

400 C{(Left, Right)} pairs).

401

402 @return: Stripped B{C{txt}} (C{str}).

403 '''

404 _e, _s, _n = str.endswith, str.startswith, len

405 while _n(txt) > 2:

406 for L, R in lrpairs.items():

407 if _e(txt, R) and _s(txt, L):

408 txt = txt[_n(L):-_n(R)]

409 break # restart

410 else:

411 return txt

412

413

414 def pairs(items, prec=6, fmt=Fmt.F, ints=False, sep=_EQUAL_):

415 '''Convert items to I{name=value} strings, with C{float}s handled like L{fstr}.

416

417 @arg items: Name-value pairs (C{dict} or 2-{tuple}s of any C{type}s).

418 @kwarg prec: The C{float} precision, number of decimal digits (0..9).

419 Trailing zero decimals are stripped if B{C{prec}} is

420 positive, but kept for negative B{C{prec}} values.

421 @kwarg fmt: Optional C{float} format (C{letter}).

422 @kwarg ints: Optionally, remove the decimal dot for C{int} values (C{bool}).

423 @kwarg sep: Separator joining I{names} and I{values} (C{str}).

424

425 @return: A C{tuple(B{sep}.join(t) for t in B{items}))} of C{str}s.

426 '''

427 try:

428 if isinstance(items, dict):

429 items = itemsorted(items)

430 elif not islistuple(items):

431 items = tuple(items)

432 # can't unzip empty items tuple, list, etc.

433 n, v = _zip(*items) if items else ((), ()) # strict=True

434 except (TypeError, ValueError):

435 raise _IsnotError(dict.__name__, '2-tuples', items=items)

436 v = _streprs(prec, v, fmt, ints, False, repr)

437 return tuple(sep.join(t) for t in _zip(map(str, n), v)) # strict=True

438

439

440 def _pct(fmt):

441 '''(INTERNAL) Prefix C{%} if needed.

442 '''

443 return fmt if _PERCENT_ in fmt else NN(_PERCENT_, fmt)

444

445

446 def reprs(objs, prec=6, fmt=Fmt.F, ints=False):

447 '''Convert objects to C{repr} strings, with C{float}s handled like L{fstr}.

448

449 @arg objs: List, sequence, tuple, etc. (any C{type}s).

450 @kwarg prec: The C{float} precision, number of decimal digits (0..9).

451 Trailing zero decimals are stripped if B{C{prec}} is

452 positive, but kept for negative B{C{prec}} values.

453 @kwarg fmt: Optional C{float} format (C{letter}).

454 @kwarg ints: Optionally, remove the decimal dot for C{int} values (C{bool}).

455

456 @return: A C{tuple(map(fstr|repr, objs))} of C{str}s.

457 '''

458 return tuple(_streprs(prec, objs, fmt, ints, False, repr)) if objs else ()

459

460

461 def _resolution10(resolution, Error=ValueError): # in .mgrs, .osgr

462 '''(INTERNAL) Validate C{resolution} in C{meter}.

463 '''

464 try:

465 r = int(_log10(resolution))

466 if _EN_WIDE < r or r < -_EN_PREC:

467 raise ValueError

468 except (ValueError, TypeError):

469 raise Error(resolution=resolution)

470 return _MODS.units.Meter(resolution=10**r)

471

472

473 def _streprs(prec, objs, fmt, ints, force, strepr):

474 '''(INTERNAL) Helper for C{fstr}, C{pairs}, C{reprs} and C{strs}

475 '''

476 # <https://docs.Python.org/3/library/stdtypes.html#printf-style-string-formatting>

477 if fmt in _FfEeGg:

478 fGg = fmt in _Gg

479 fmt = NN(_PERCENT_, _DOT_, abs(prec), fmt)

480

481 elif fmt.startswith(_PERCENT_):

482 fGg = False

483 try: # to make sure fmt is valid

484 f = fmt.replace(_DOTSTAR_, Fmt.DOT(abs(prec)))

485 _ = f % (_0_0,)

486 except (TypeError, ValueError):

487 raise _ValueError(fmt=fmt, txt=_not_(repr(_DOTSTAR_)))

488 fmt = f

489

490 else:

491 raise _ValueError(fmt=fmt, txt=_not_(repr(_Fspec_)))

492

493 for i, o in enumerate(objs):

494 if force or isinstance(o, float):

495 t = fmt % (float(o),)

496 if ints and t.rstrip(_0to9_ if isint(o, both=True) else

497 _0_).endswith(_DOT_):

498 t = t.split(_DOT_)[0]

499 elif prec > 1:

500 t = fstrzs(t, ap1z=fGg)

501 elif strepr:

502 t = strepr(o)

503 else:

504 t = Fmt.PARENSPACED(Fmt.SQUARE(objs=i), o)

505 raise TypeError(_SPACE_(t, _not_scalar_))

506 yield t

507

508

509 def strs(objs, prec=6, fmt=Fmt.F, ints=False):

510 '''Convert objects to C{str} strings, with C{float}s handled like L{fstr}.

511

512 @arg objs: List, sequence, tuple, etc. (any C{type}s).

513 @kwarg prec: The C{float} precision, number of decimal digits (0..9).

514 Trailing zero decimals are stripped if B{C{prec}} is

515 positive, but kept for negative B{C{prec}} values.

516 @kwarg fmt: Optional C{float} format (C{letter}).

517 @kwarg ints: Optionally, remove the decimal dot for C{int} values (C{bool}).

518

519 @return: A C{tuple(map(fstr|str, objs))} of C{str}s.

520 '''

521 return tuple(_streprs(prec, objs, fmt, ints, False, str)) if objs else ()

522

523

524 def unstr(where, *args, **kwds):

525 '''Return the string representation of an invokation.

526

527 @arg where: Class, function, method (C{type}) or name (C{str}).

528 @arg args: Optional positional arguments.

529 @kwarg kwds: Optional keyword arguments, except

530 C{B{_ELLIPSIS}=False}.

531

532 @return: Representation (C{str}).

533 '''

534 t = reprs(args, fmt=Fmt.g) if args else ()

535 e, kwds = _xkwds_pop2(kwds, _ELLIPSIS=False)

536 if e:

537 t += _ELLIPSIS_,

538 if kwds:

539 t += pairs(itemsorted(kwds), fmt=Fmt.g)

540 n = where if isstr(where) else _dunder_nameof(where)

541 return Fmt.PAREN(n, _COMMASPACE_.join(t))

542

543

544 def _0wd(*w_i): # in .osgr, .wgrs

545 '''(INTERNAL) Int formatter'.

546 '''

547 return '%0*d' % w_i

548

549

550 def _0wdot(w, f, dot=0):

551 '''(INTERNAL) Int and Float formatter'.

552 '''

553 s = _0wd(w, int(f))

554 if dot:

555 s = _DOT_(s[:dot], s[dot:])

556 return s

557

558

559 def _0wpF(*w_p_f): # in .dms, .osgr

560 '''(INTERNAL) Float deg, min, sec formatter'.

561 '''

562 return '%0*.*f' % w_p_f # XXX was F

563

564

565 def _xattrs(insto, other, *attrs): # see .errors._xattr

566 '''(INTERNAL) Copy attribute values from B{C{other}} to B{C{insto}}.

567

568 @arg insto: Object to copy attribute values to (any C{type}).

569 @arg other: Object to copy attribute values from (any C{type}).

570 @arg attrs: One or more attribute names (C{str}s).

571

572 @return: Object B{C{insto}}, updated.

573

574 @raise AttributeError: An B{C{attrs}} doesn't exist

575 or is not settable.

576 '''

577 def _getattr(o, a):

578 if hasattr(o, a):

579 return getattr(o, a)

580 try:

581 n = o._DOT_(a)

582 except AttributeError:

583 n = Fmt.DOT(a)

584 raise _AttributeError(o, name=n)

585

586 for a in attrs:

587 s = _getattr(other, a)

588 g = _getattr(insto, a)

589 if (g is None and s is not None) or g != s:

590 setattr(insto, a, s) # not settable?

591 return insto

592

593

594 def _xzipairs(names, values, sep=_COMMASPACE_, fmt=NN, pair_fmt=Fmt.COLON):

595 '''(INTERNAL) Zip C{names} and C{values} into a C{str}, joined and bracketed.

596 '''

597 try:

598 t = sep.join(pair_fmt(*t) for t in _zip(names, values)) # strict=True

599 except Exception as x:

600 raise _ValueError(names=names, values=values, cause=x)

601 return (fmt % (t,)) if fmt else t # enc

602

603# **) MIT License

604#

605# Copyright (C) 2016-2024 -- mrJean1 at Gmail -- All Rights Reserved.

606#

607# Permission is hereby granted, free of charge, to any person obtaining a

608# copy of this software and associated documentation files (the "Software"),

609# to deal in the Software without restriction, including without limitation

610# the rights to use, copy, modify, merge, publish, distribute, sublicense,

611# and/or sell copies of the Software, and to permit persons to whom the

612# Software is furnished to do so, subject to the following conditions:

613#

614# The above copyright notice and this permission notice shall be included

615# in all copies or substantial portions of the Software.

616#

617# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

618# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

619# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

620# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR

621# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

622# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

623# OTHER DEALINGS IN THE SOFTWARE.