1

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

3

4 u'''Some, basic definitions, functions and dependencies.

5

6 Use env variable C{PYGEODESY_XPACKAGES} to avoid import of dependencies

7 C{geographiclib}, C{numpy} and/or C{scipy}. Set C{PYGEODESY_XPACKAGES}

8 to a comma-separated list of package names to be excluded from import.

9'''

10# make sure int/int division yields float quotient

11 from __future__ import division

12 division = 1 / 2 # .albers, .azimuthal, .constants, etc., .utily

13 if not division:

14 raise ImportError('%s 1/2 == %s' % ('division', division))

15 del division

16

17 from pygeodesy.errors import _AssertionError, _AttributeError, _ImportError, \

18 _TypeError, _TypesError, _ValueError, _xkwds_get

19 from pygeodesy.interns import MISSING, NN, _1_, _by_, _COMMA_, _DOT_, _ELLIPSIS4_, \

20 _enquote, _EQUAL_, _in_, _invalid_, _N_A_, _SPACE_, \

21 _UNDER_, _version_ # _utf_8_

22 from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS, _FOR_DOCS, \

23 _getenv, _sys, _sys_version_info2

24

25 from copy import copy as _copy, deepcopy as _deepcopy

26 from math import copysign as _copysign

27 import inspect as _inspect

28

29__all__ = _ALL_LAZY.basics

30__version__ = '23.10.08'

31

32_0_0 = 0.0 # in .constants

33_below_ = 'below'

34_can_t_ = "can't"

35_list_tuple_types = (list, tuple)

36_list_tuple_set_types = (list, tuple, set)

37_odd_ = 'odd'

38_required_ = 'required'

39_PYGEODESY_XPACKAGES_ = 'PYGEODESY_XPACKAGES'

40

41 try: # Luciano Ramalho, "Fluent Python", O'Reilly, 2016 p. 395, 2022 p. 577+

42 from numbers import Integral as _Ints, Real as _Scalars

43 except ImportError:

44 try:

45 _Ints = int, long # int objects (C{tuple})

46 except NameError: # Python 3+

47 _Ints = int, # int objects (C{tuple})

48 _Scalars = _Ints + (float,)

49

50 try:

51 try: # use C{from collections.abc import ...} in Python 3.9+

52 from collections.abc import Sequence as _Sequence # in .points

53 except ImportError: # no .abc in Python 3.8- and 2.7-

54 from collections import Sequence as _Sequence # in .points

55 if isinstance([], _Sequence) and isinstance((), _Sequence):

56 # and isinstance(range(1), _Sequence):

57 _Seqs = _Sequence

58 else:

59 raise ImportError # _AssertionError

60 except ImportError:

61 _Sequence = tuple # immutable for .points._Basequence

62 _Seqs = list, _Sequence # , range for function len2 below

63

64 try:

65 _Bytes = unicode, bytearray # PYCHOK expected

66 _Strs = basestring, str # XXX , bytes

67

68 def _pass(x): # == .utily._passarg

69 '''Pass thru, no-op'''

70 return x

71

72 str2ub = ub2str = _pass # avoids UnicodeDecodeError

73

74 def _Xstr(exc): # PYCHOK no cover

75 '''I{Invoke only with caught ImportError} B{C{exc}}.

76

77 C{... "can't import name _distributor_init" ...}

78

79 only for C{numpy}, C{scipy} import errors occurring

80 on arm64 Apple Silicon running macOS' Python 2.7.16?

81 '''

82 t = str(exc)

83 if '_distributor_init' in t:

84 from sys import exc_info

85 from traceback import extract_tb

86 tb = exc_info()[2] # 3-tuple (type, value, traceback)

87 t4 = extract_tb(tb, 1)[0] # 4-tuple (file, line, name, 'import ...')

88 t = _SPACE_(_can_t_, t4[3] or _N_A_)

89 del tb, t4

90 return t

91

92 except NameError: # Python 3+

93 from pygeodesy.interns import _utf_8_

94

95 _Bytes = bytes, bytearray

96 _Strs = str, # tuple

97 _Xstr = str

98

99 def str2ub(sb):

100 '''Convert C{str} to C{unicode bytes}.

101 '''

102 if isinstance(sb, _Strs):

103 sb = sb.encode(_utf_8_)

104 return sb

105

106 def ub2str(ub):

107 '''Convert C{unicode bytes} to C{str}.

108 '''

109 if isinstance(ub, _Bytes):

110 ub = str(ub.decode(_utf_8_))

111 return ub

112

113

114 def clips(sb, limit=50, white=NN):

115 '''Clip a string to the given length limit.

116

117 @arg sb: String (C{str} or C{bytes}).

118 @kwarg limit: Length limit (C{int}).

119 @kwarg white: Optionally, replace all whitespace (C{str}).

120

121 @return: The clipped or unclipped B{C{sb}}.

122 '''

123 T = type(sb)

124 if len(sb) > limit > 8:

125 h = limit // 2

126 sb = T(_ELLIPSIS4_).join((sb[:h], sb[-h:]))

127 if white: # replace whitespace

128 sb = T(white).join(sb.split())

129 return sb

130

131

132 def copysign0(x, y):

133 '''Like C{math.copysign(x, y)} except C{zero}, I{unsigned}.

134

135 @return: C{math.copysign(B{x}, B{y})} if B{C{x}} else

136 C{type(B{x})(0)}.

137 '''

138 return _copysign(x, (y if y else 0)) if x else copytype(0, x)

139

140

141 def copytype(x, y):

142 '''Return the value of B{x} as C{type} of C{y}.

143

144 @return: C{type(B{y})(B{x})}.

145 '''

146 return type(y)(x if x else _0_0)

147

148

149 def halfs2(str2):

150 '''Split a string in 2 halfs.

151

152 @arg str2: String to split (C{str}).

153

154 @return: 2-Tuple C{(_1st, _2nd)} half (C{str}).

155

156 @raise ValueError: Zero or odd C{len(B{str2})}.

157 '''

158 h, r = divmod(len(str2), 2)

159 if r or not h:

160 raise _ValueError(str2=str2, txt=_odd_)

161 return str2[:h], str2[h:]

162

163

164 def int1s(x):

165 '''Count the number of 1-bits in an C{int}, I{unsigned}.

166

167 @note: C{int1s(-B{x}) == int1s(abs(B{x}))}.

168 '''

169 try:

170 return x.bit_count() # Python 3.10+

171 except AttributeError:

172 # bin(-x) = '-' + bin(abs(x))

173 return bin(x).count(_1_)

174

175

176 def isbool(obj):

177 '''Check whether an object is C{bool}ean.

178

179 @arg obj: The object (any C{type}).

180

181 @return: C{True} if B{C{obj}} is C{bool}ean,

182 C{False} otherwise.

183 '''

184 return isinstance(obj, bool) # and (obj is False

185# or obj is True)

186

187 if isbool(1) or isbool(0): # PYCHOK assert

188 raise _AssertionError(isbool=1)

189

190 if _FOR_DOCS: # XXX avoid epidoc Python 2.7 error

191

192 def isclass(obj):

193 '''Return C{True} if B{C{obj}} is a C{class} or C{type}.

194

195 @see: Python's C{inspect.isclass}.

196 '''

197 return _inspect.isclass(obj)

198 else:

199 isclass = _inspect.isclass

200

201

202 def isCartesian(obj):

203 '''Is B{C{obj}} some C{Cartesian}?

204

205 @arg obj: The object (any C{type}).

206

207 @return: C{type(B{obj}} if B{C{obj}} is a C{Cartesian}

208 instance, C{None} otherwise.

209 '''

210 return isinstanceof(obj, _MODS.cartesianBase.CartesianBase)

211

212

213 def iscomplex(obj):

214 '''Check whether an object is a C{complex} or complex C{str}.

215

216 @arg obj: The object (any C{type}).

217

218 @return: C{True} if B{C{obj}} is C{complex}, otherwise

219 C{False}.

220 '''

221 try: # hasattr('conjugate'), hasattr('real') and hasattr('imag')

222 return isinstance(obj, complex) or (isstr(obj)

223 and isinstance(complex(obj), complex)) # numbers.Complex?

224 except (TypeError, ValueError):

225 return False

226

227

228 def isfloat(obj):

229 '''Check whether an object is a C{float} or float C{str}.

230

231 @arg obj: The object (any C{type}).

232

233 @return: C{True} if B{C{obj}} is a C{float}, otherwise

234 C{False}.

235 '''

236 try:

237 return isinstance( obj, float) or (isstr(obj)

238 and isinstance(float(obj), float))

239 except (TypeError, ValueError):

240 return False

241

242

243 try:

244 isidentifier = str.isidentifier # Python 3, must be str

245 except AttributeError: # Python 2-

246

247 def isidentifier(obj):

248 '''Return C{True} if B{C{obj}} is a Python identifier.

249 '''

250 return bool(obj and isstr(obj)

251 and obj.replace(_UNDER_, NN).isalnum()

252 and not obj[:1].isdigit())

253

254

255 def isinstanceof(obj, *classes):

256 '''Is B{C{ob}} an intance of one of the C{classes}?

257

258 @arg obj: The instance (any C{type}).

259 @arg classes: One or more classes (C{class}).

260

261 @return: C{type(B{obj}} if B{C{obj}} is an instance

262 of the B{C{classes}}, C{None} otherwise.

263 '''

264 return type(obj) if isinstance(obj, classes) else None

265

266

267 def isint(obj, both=False):

268 '''Check for C{int} type or an integer C{float} value.

269

270 @arg obj: The object (any C{type}).

271 @kwarg both: If C{true}, check C{float} and L{Fsum}

272 type and value (C{bool}).

273

274 @return: C{True} if B{C{obj}} is C{int} or I{integer}

275 C{float} or L{Fsum}, C{False} otherwise.

276

277 @note: Both C{isint(True)} and C{isint(False)} return

278 C{False} (and no longer C{True}).

279 '''

280 if isinstance(obj, _Ints) and not isbool(obj):

281 return True

282 elif both: # and isinstance(obj, (float, Fsum))

283 try: # NOT , _Scalars) to include Fsum!

284 return obj.is_integer()

285 except AttributeError:

286 pass # XXX float(int(obj)) == obj?

287 return False

288

289

290 try:

291 from keyword import iskeyword # Python 2.7+

292 except ImportError:

293

294 def iskeyword(unused):

295 '''Not Implemented, C{False} always.

296 '''

297 return False

298

299

300 def isLatLon(obj):

301 '''Is B{C{obj}} some C{LatLon}?

302

303 @arg obj: The object (any C{type}).

304

305 @return: C{type(B{obj}} if B{C{obj}} is a C{LatLon}

306 instance, C{None} otherwise.

307 '''

308 return isinstanceof(obj, _MODS.latlonBase.LatLonBase)

309

310

311 def islistuple(obj, minum=0):

312 '''Check for list or tuple C{type} with a minumal length.

313

314 @arg obj: The object (any C{type}).

315 @kwarg minum: Minimal C{len} required C({int}).

316

317 @return: C{True} if B{C{obj}} is C{list} or C{tuple} with

318 C{len} at least B{C{minum}}, C{False} otherwise.

319 '''

320 return type(obj) in _list_tuple_types and len(obj) >= (minum or 0)

321

322

323 def isNvector(obj):

324 '''Is B{C{obj}} some C{Nvector}?

325

326 @arg obj: The object (any C{type}).

327

328 @return: C{type(B{obj}} if B{C{obj}} is an C{Nvector}

329 instance, C{None} otherwise.

330 '''

331 return isinstanceof(obj, _MODS.nvectorBase.NvectorBase)

332

333

334 def isodd(x):

335 '''Is B{C{x}} odd?

336

337 @arg x: Value (C{scalar}).

338

339 @return: C{True} if B{C{x}} is odd,

340 C{False} otherwise.

341 '''

342 return bool(int(x) & 1) # == bool(int(x) % 2)

343

344

345 def isscalar(obj):

346 '''Check for scalar types.

347

348 @arg obj: The object (any C{type}).

349

350 @return: C{True} if B{C{obj}} is C{scalar}, C{False} otherwise.

351 '''

352 return isinstance(obj, _Scalars) and not isbool(obj)

353

354

355 def issequence(obj, *excls):

356 '''Check for sequence types.

357

358 @arg obj: The object (any C{type}).

359 @arg excls: Classes to exclude (C{type}), all positional.

360

361 @note: Excluding C{tuple} implies excluding C{namedtuple}.

362

363 @return: C{True} if B{C{obj}} is a sequence, C{False} otherwise.

364 '''

365 return isinstance(obj, _Seqs) and not (excls and isinstance(obj, excls))

366

367

368 def isstr(obj):

369 '''Check for string types.

370

371 @arg obj: The object (any C{type}).

372

373 @return: C{True} if B{C{obj}} is C{str}, C{False} otherwise.

374 '''

375 return isinstance(obj, _Strs)

376

377

378 def issubclassof(Sub, *Supers):

379 '''Check whether a class is a sub-class of some other class(es).

380

381 @arg Sub: The sub-class (C{class}).

382 @arg Supers: One or more C(super) classes (C{class}).

383

384 @return: C{True} if B{C{Sub}} is a sub-class of any B{C{Supers}},

385 C{False} if not (C{bool}) or C{None} if B{C{Sub}} is not

386 a class or if no B{C{Supers}} are given or none of those

387 are a class.

388 '''

389 if isclass(Sub):

390 t = tuple(S for S in Supers if isclass(S))

391 if t:

392 return bool(issubclass(Sub, t))

393 return None

394

395

396 def len2(items):

397 '''Make built-in function L{len} work for generators, iterators,

398 etc. since those can only be started exactly once.

399

400 @arg items: Generator, iterator, list, range, tuple, etc.

401

402 @return: 2-Tuple C{(n, items)} of the number of items (C{int})

403 and the items (C{list} or C{tuple}).

404 '''

405 if not isinstance(items, _Seqs): # NOT hasattr(items, '__len__'):

406 items = list(items)

407 return len(items), items

408

409

410 def map1(fun1, *xs): # XXX map_

411 '''Apply each B{C{xs}} to a single-argument function and

412 return a C{tuple} of results.

413

414 @arg fun1: 1-Arg function to apply (C{callable}).

415 @arg xs: Arguments to apply (C{any positional}).

416

417 @return: Function results (C{tuple}).

418 '''

419 return tuple(map(fun1, xs))

420

421

422 def map2(func, *xs):

423 '''Apply arguments to a function and return a C{tuple} of results.

424

425 Unlike Python 2's built-in L{map}, Python 3+ L{map} returns a

426 L{map} object, an iterator-like object which generates the

427 results only once. Converting the L{map} object to a tuple

428 maintains the Python 2 behavior.

429

430 @arg func: Function to apply (C{callable}).

431 @arg xs: Arguments to apply (C{list, tuple, ...}).

432

433 @return: Function results (C{tuple}).

434 '''

435 return tuple(map(func, *xs))

436

437

438 def neg(x, neg0=None):

439 '''Negate C{x} and optionally, negate C{0.0} amd C{-0.0}.

440

441 @kwarg neg0: Defines the return value for zero C{B{x}}: if C{None}

442 return C{0.0}, if C{True} return C{NEG0 if B{x}=0.0}

443 and C{0.0 if B{x}=NEG0} or if C{False} return C{B{x}}

444 I{as-is} (C{bool} or C{None}).

445

446 @return: C{-B{x} if B{x} else 0.0, NEG0 or B{x}}.

447 '''

448 return (-x) if x else (_0_0 if neg0 is None else (x if not neg0 else

449 (_0_0 if signBit(x) else _MODS.constants.NEG0)))

450

451

452 def neg_(*xs):

453 '''Negate all C{xs} with L{neg}.

454

455 @return: A C{map(neg, B{xs})}.

456 '''

457 return map(neg, xs)

458

459

460 def _reverange(n, stop=-1, step=-1):

461 '''(INTERNAL) Reversed range yielding C{n-1, n-1-step, ..., stop+1}.

462 '''

463 return range(n - 1, stop, step)

464

465

466 def signBit(x):

467 '''Return C{signbit(B{x})}, like C++.

468

469 @return: C{True} if C{B{x} < 0} or C{NEG0} (C{bool}).

470 '''

471 return x < 0 or _MODS.constants.isneg0(x)

472

473

474 def _signOf(x, ref): # in .fsums

475 '''(INTERNAL) Return the sign of B{C{x}} versus B{C{ref}}.

476 '''

477 return +1 if x > ref else (-1 if x < ref else 0)

478

479

480 def signOf(x):

481 '''Return sign of C{x} as C{int}.

482

483 @return: -1, 0 or +1 (C{int}).

484 '''

485 try:

486 s = x.signOf() # Fsum instance?

487 except AttributeError:

488 s = _signOf(x, 0)

489 return s

490

491

492 def _sizeof(inst):

493 '''(INTERNAL) Recursively size an C{inst}ance.

494

495 @return: Instance' size in bytes (C{int}),

496 ignoring class attributes and

497 counting duplicates only once or

498 C{None}.

499

500 @note: With C{PyPy}, the size is always C{None}.

501 '''

502 try:

503 _zB = _sys.getsizeof

504 _zD = _zB(None) # get some default

505 except TypeError: # PyPy3.10

506 return None

507

508 def _zR(s, iterable):

509 z, _s = 0, s.add

510 for o in iterable:

511 i = id(o)

512 if i not in s:

513 _s(i)

514 z += _zB(o, _zD)

515 if isinstance(o, dict):

516 z += _zR(s, o.keys())

517 z += _zR(s, o.values())

518 elif isinstance(o, _list_tuple_set_types):

519 z += _zR(s, o)

520 else:

521 try: # size instance' attr values only

522 z += _zR(s, o.__dict__.values())

523 except AttributeError: # None, int, etc.

524 pass

525 return z

526

527 return _zR(set(), (inst,))

528

529

530 def splice(iterable, n=2, **fill):

531 '''Split an iterable into C{n} slices.

532

533 @arg iterable: Items to be spliced (C{list}, C{tuple}, ...).

534 @kwarg n: Number of slices to generate (C{int}).

535 @kwarg fill: Optional fill value for missing items.

536

537 @return: A generator for each of B{C{n}} slices,

538 M{iterable[i::n] for i=0..n}.

539

540 @raise TypeError: Invalid B{C{n}}.

541

542 @note: Each generated slice is a C{tuple} or a C{list},

543 the latter only if the B{C{iterable}} is a C{list}.

544

545 @example:

546

547 >>> from pygeodesy import splice

548

549 >>> a, b = splice(range(10))

550 >>> a, b

551 ((0, 2, 4, 6, 8), (1, 3, 5, 7, 9))

552

553 >>> a, b, c = splice(range(10), n=3)

554 >>> a, b, c

555 ((0, 3, 6, 9), (1, 4, 7), (2, 5, 8))

556

557 >>> a, b, c = splice(range(10), n=3, fill=-1)

558 >>> a, b, c

559 ((0, 3, 6, 9), (1, 4, 7, -1), (2, 5, 8, -1))

560

561 >>> tuple(splice(list(range(9)), n=5))

562 ([0, 5], [1, 6], [2, 7], [3, 8], [4])

563

564 >>> splice(range(9), n=1)

565 <generator object splice at 0x0...>

566 '''

567 if not isint(n):

568 raise _TypeError(n=n)

569

570 t = iterable

571 if not isinstance(t, _list_tuple_types):

572 t = tuple(t) # force tuple, also for PyPy3

573

574 if n > 1:

575 if fill:

576 fill = _xkwds_get(fill, fill=MISSING)

577 if fill is not MISSING:

578 m = len(t) % n

579 if m > 0: # same type fill

580 t += type(t)((fill,) * (n - m))

581 for i in range(n):

582 # XXX t[i::n] chokes PyChecker

583 yield t[slice(i, None, n)]

584 else:

585 yield t

586

587

588 def _splituple(strs, *sep_splits): # in .mgrs, .osgr, .webmercator

589 '''(INTERNAL) Split a C{comma}- or C{whitespace}-separated

590 string into a C{tuple} of stripped strings.

591 '''

592 t = (strs.split(*sep_splits) if sep_splits else

593 strs.replace(_COMMA_, _SPACE_).split()) if strs else ()

594 return tuple(s.strip() for s in t if s)

595

596

597_XPACKAGES = _splituple(_getenv(_PYGEODESY_XPACKAGES_, NN))

598

599

600 def unsigned0(x):

601 '''Unsign if C{0.0}.

602

603 @return: C{B{x}} if B{C{x}} else C{0.0}.

604 '''

605 return x if x else _0_0

606

607

608 def _xargs_names(callabl):

609 '''(INTERNAL) Get the C{callabl}'s args names.

610 '''

611 try:

612 args_kwds = _inspect.signature(callabl).parameters.keys()

613 except AttributeError: # .signature new Python 3+

614 args_kwds = _inspect.getargspec(callabl).args

615 return tuple(args_kwds)

616

617

618 def _xcopy(inst, deep=False):

619 '''(INTERNAL) Copy an object, shallow or deep.

620

621 @arg inst: The object to copy (any C{type}).

622 @kwarg deep: If C{True} make a deep, otherwise

623 a shallow copy (C{bool}).

624

625 @return: The copy of B{C{inst}}.

626 '''

627 return _deepcopy(inst) if deep else _copy(inst)

628

629

630 def _xdup(inst, deep=False, **items):

631 '''(INTERNAL) Duplicate an object, replacing some attributes.

632

633 @arg inst: The object to copy (any C{type}).

634 @kwarg deep: If C{True} copy deep, otherwise shallow.

635 @kwarg items: Attributes to be changed (C{any}).

636

637 @return: A duplicate of B{C{inst}} with modified

638 attributes, if any B{C{items}}.

639

640 @raise AttributeError: Some B{C{items}} invalid.

641 '''

642 d = _xcopy(inst, deep=deep)

643 for n, v in items.items():

644 if getattr(d, n, v) != v:

645 setattr(d, n, v)

646 elif not hasattr(d, n):

647 t = _MODS.named.classname(inst)

648 t = _SPACE_(_DOT_(t, n), _invalid_)

649 raise _AttributeError(txt=t, this=inst, **items)

650 return d

651

652

653 def _xgeographiclib(where, *required):

654 '''(INTERNAL) Import C{geographiclib} and check required version.

655 '''

656 try:

657 _xpackage(_xgeographiclib)

658 import geographiclib

659 except ImportError as x:

660 raise _xImportError(x, where)

661 return _xversion(geographiclib, where, *required)

662

663

664 def _xImportError(x, where, **name):

665 '''(INTERNAL) Embellish an C{ImportError}.

666 '''

667 t = _SPACE_(_required_, _by_, _xwhere(where, **name))

668 return _ImportError(_Xstr(x), txt=t, cause=x)

669

670

671 def _xinstanceof(*Types, **name_value_pairs):

672 '''(INTERNAL) Check C{Types} of all C{name=value} pairs.

673

674 @arg Types: One or more classes or types (C{class}),

675 all positional.

676 @kwarg name_value_pairs: One or more C{B{name}=value} pairs

677 with the C{value} to be checked.

678

679 @raise TypeError: One of the B{C{name_value_pairs}} is not

680 an instance of any of the B{C{Types}}.

681 '''

682 if Types and name_value_pairs:

683 for n, v in name_value_pairs.items():

684 if not isinstance(v, Types):

685 raise _TypesError(n, v, *Types)

686 else:

687 raise _AssertionError(Types=Types, name_value_pairs=name_value_pairs)

688

689

690 def _xnumpy(where, *required):

691 '''(INTERNAL) Import C{numpy} and check required version.

692 '''

693 try:

694 _xpackage(_xnumpy)

695 import numpy

696 except ImportError as x:

697 raise _xImportError(x, where)

698 return _xversion(numpy, where, *required)

699

700

701 def _xpackage(_xpkg):

702 '''(INTERNAL) Check dependency to be excluded.

703 '''

704 n = _xpkg.__name__[2:]

705 if n in _XPACKAGES:

706 x = _SPACE_(n, _in_, _PYGEODESY_XPACKAGES_)

707 e = _enquote(_getenv(_PYGEODESY_XPACKAGES_, NN))

708 raise ImportError(_EQUAL_(x, e))

709

710

711 def _xor(x, *xs):

712 '''(INTERNAL) Exclusive-or C{x} and C{xs}.

713 '''

714 for x_ in xs:

715 x ^= x_

716 return x

717

718

719 def _xscipy(where, *required):

720 '''(INTERNAL) Import C{scipy} and check required version.

721 '''

722 try:

723 _xpackage(_xscipy)

724 import scipy

725 except ImportError as x:

726 raise _xImportError(x, where)

727 return _xversion(scipy, where, *required)

728

729

730 def _xsubclassof(*Classes, **name_value_pairs):

731 '''(INTERNAL) Check (super) class of all C{name=value} pairs.

732

733 @arg Classes: One or more classes or types (C{class}),

734 all positional.

735 @kwarg name_value_pairs: One or more C{B{name}=value} pairs

736 with the C{value} to be checked.

737

738 @raise TypeError: One of the B{C{name_value_pairs}} is not

739 a (sub-)class of any of the B{C{Classes}}.

740 '''

741 for n, v in name_value_pairs.items():

742 if not issubclassof(v, *Classes):

743 raise _TypesError(n, v, *Classes)

744

745

746 def _xversion(package, where, *required, **name):

747 '''(INTERNAL) Check the C{package} version vs B{C{required}}.

748 '''

749 n = len(required)

750 if n:

751 t = _xversion_info(package)

752 if t[:n] < required:

753 t = _SPACE_(package.__name__, _version_, _DOT_(*t),

754 _below_, _DOT_(*required),

755 _required_, _by_, _xwhere(where, **name))

756 raise ImportError(t)

757 return package

758

759

760 def _xversion_info(package): # in .karney

761 '''(INTERNAL) Get the C{package.__version_info__} as a 2- or

762 3-tuple C{(major, minor, revision)} if C{int}s.

763 '''

764 try:

765 t = package.__version_info__

766 except AttributeError:

767 t = package.__version__.strip()

768 t = t.replace(_DOT_, _SPACE_).split()[:3]

769 return map2(int, t)

770

771

772 def _xwhere(where, **name):

773 '''(INTERNAL) Get the fully qualified name.

774 '''

775 m = _MODS.named.modulename(where, prefixed=True)

776 if name:

777 n = _xkwds_get(name, name=NN)

778 if n:

779 m = _DOT_(m, n)

780 return m

781

782

783 if _sys_version_info2 < (3, 10): # see .errors

784 _zip = zip # PYCHOK exported

785 else: # Python 3.10+

786

787 def _zip(*args):

788 return zip(*args, strict=True)

789

790# **) MIT License

791#

792# Copyright (C) 2016-2023 -- mrJean1 at Gmail -- All Rights Reserved.

793#

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

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

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

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

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

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

800#

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

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

803#

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

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

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

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

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

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

810# OTHER DEALINGS IN THE SOFTWARE.