Coverage for pygeodesy/basics.py: 91%

222 statements  

« prev     ^ index     » next       coverage.py v7.2.2, created at 2023-09-01 13:41 -0400

1 

2# -*- coding: utf-8 -*- 

3 

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

5 

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

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

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

9''' 

10# make sure int/int division yields float quotient 

11from __future__ import division 

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

13if not division: 

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

15del division 

16 

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

18 _TypeError, _TypesError, _ValueError, _xkwds_get 

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

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

21 _UNDER_, _version_ # _utf_8_ 

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

23 _getenv, _sys, _sys_version_info2 

24 

25from copy import copy as _copy, deepcopy as _deepcopy 

26from math import copysign as _copysign 

27import inspect as _inspect 

28 

29__all__ = _ALL_LAZY.basics 

30__version__ = '23.08.24' 

31 

32_0_0 = 0.0 # in .constants 

33_below_ = 'below' 

34_cannot_ = 'cannot' 

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 

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

42 from numbers import Integral as _Ints, Real as _Scalars 

43except 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 

50try: 

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 

60except ImportError: 

61 _Sequence = tuple # immutable for .points._Basequence 

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

63 

64try: 

65 _Bytes = unicode, bytearray # PYCHOK expected 

66 _Strs = basestring, str # XXX , bytes 

67 

68 def _NOP(x): 

69 '''NOP, pass thru.''' 

70 return x 

71 

72 str2ub = ub2str = _NOP # avoids UnicodeDecodeError 

73 

74 def _Xstr(exc): # PYCHOK no cover 

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

76 

77 C{... "cannot 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_(_cannot_, t4[3] or _N_A_) 

89 del tb, t4 

90 return t 

91 

92except 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 

114def 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 

132def 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 

141def 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 

149def 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 

164def isbool(obj): 

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

166 

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

168 

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

170 C{False} otherwise. 

171 ''' 

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

173# or obj is True) 

174 

175if isbool(1) or isbool(0): # PYCHOK assert 

176 raise _AssertionError(isbool=1) 

177 

178if _FOR_DOCS: # XXX avoid epidoc Python 2.7 error 

179 

180 def isclass(obj): 

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

182 

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

184 ''' 

185 return _inspect.isclass(obj) 

186else: 

187 isclass = _inspect.isclass 

188 

189 

190def iscomplex(obj): 

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

192 

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

194 

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

196 C{False}. 

197 ''' 

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

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

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

201 except (TypeError, ValueError): 

202 return False 

203 

204 

205def isfloat(obj): 

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

207 

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

209 

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

211 C{False}. 

212 ''' 

213 try: 

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

215 and isinstance(float(obj), float)) 

216 except (TypeError, ValueError): 

217 return False 

218 

219 

220try: 

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

222except AttributeError: # Python 2- 

223 

224 def isidentifier(obj): 

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

226 ''' 

227 return bool(obj and isstr(obj) 

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

229 and not obj[:1].isdigit()) 

230 

231 

232def isinstanceof(obj, *classes): 

233 '''Check an instance of one or several C{classes}. 

234 

235 @arg obj: The instance (C{any}). 

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

237 

238 @return: C{True} if B{C{obj}} is in instance of 

239 one of the B{C{classes}}. 

240 ''' 

241 return isinstance(obj, classes) 

242 

243 

244def isint(obj, both=False): 

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

246 

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

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

249 type and value (C{bool}). 

250 

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

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

253 

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

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

256 ''' 

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

258 return True 

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

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

261 return obj.is_integer() 

262 except AttributeError: 

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

264 return False 

265 

266 

267try: 

268 from keyword import iskeyword # Python 2.7+ 

269except ImportError: 

270 

271 def iskeyword(unused): 

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

273 ''' 

274 return False 

275 

276 

277def islistuple(obj, minum=0): 

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

279 

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

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

282 

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

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

285 ''' 

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

287 

288 

289def isodd(x): 

290 '''Is B{C{x}} odd? 

291 

292 @arg x: Value (C{scalar}). 

293 

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

295 C{False} otherwise. 

296 ''' 

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

298 

299 

300def isscalar(obj): 

301 '''Check for scalar types. 

302 

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

304 

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

306 ''' 

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

308 

309 

310def issequence(obj, *excls): 

311 '''Check for sequence types. 

312 

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

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

315 

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

317 

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

319 ''' 

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

321 

322 

323def isstr(obj): 

324 '''Check for string types. 

325 

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

327 

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

329 ''' 

330 return isinstance(obj, _Strs) 

331 

332 

333def issubclassof(Sub, *Supers): 

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

335 

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

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

338 

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

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

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

342 are a class. 

343 ''' 

344 if isclass(Sub): 

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

346 if t: 

347 return bool(issubclass(Sub, t)) 

348 return None 

349 

350 

351def len2(items): 

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

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

354 

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

356 

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

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

359 ''' 

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

361 items = list(items) 

362 return len(items), items 

363 

364 

365def map1(fun1, *xs): # XXX map_ 

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

367 return a C{tuple} of results. 

368 

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

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

371 

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

373 ''' 

374 return tuple(map(fun1, xs)) 

375 

376 

377def map2(func, *xs): 

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

379 

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

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

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

383 maintains the Python 2 behavior. 

384 

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

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

387 

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

389 ''' 

390 return tuple(map(func, *xs)) 

391 

392 

393def neg(x): 

394 '''Negate C{x} unless C{zero} or C{NEG0}. 

395 

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

397 ''' 

398 return (-x) if x else _0_0 

399 

400 

401def neg_(*xs): 

402 '''Negate all C{xs} with L{neg}. 

403 

404 @return: A C{map(neg, B{xs})}. 

405 ''' 

406 return map(neg, xs) 

407 

408 

409def _reverange(n): 

410 '''(INTERNAL) Reversed range yielding (n-1, n-2, ..., 1, 0). 

411 ''' 

412 return range(n - 1, -1, -1) 

413 

414 

415def signBit(x): 

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

417 

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

419 ''' 

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

421 

422 

423def _signOf(x, ref): # in .fsums 

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

425 ''' 

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

427 

428 

429def signOf(x): 

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

431 

432 @return: -1, 0 or +1 (C{int}). 

433 ''' 

434 try: 

435 s = x.signOf() # Fsum instance? 

436 except AttributeError: 

437 s = _signOf(x, 0) 

438 return s 

439 

440 

441def _sizeof(inst): 

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

443 

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

445 ignoring class attributes and 

446 counting duplicates only once or 

447 C{None}. 

448 

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

450 ''' 

451 try: 

452 _zB = _sys.getsizeof 

453 _zD = _zB(None) # get some default 

454 except TypeError: # PyPy3.10 

455 return None 

456 

457 def _zR(s, iterable): 

458 z, _s = 0, s.add 

459 for o in iterable: 

460 i = id(o) 

461 if i not in s: 

462 _s(i) 

463 z += _zB(o, _zD) 

464 if isinstance(o, dict): 

465 z += _zR(s, o.keys()) 

466 z += _zR(s, o.values()) 

467 elif isinstance(o, _list_tuple_set_types): 

468 z += _zR(s, o) 

469 else: 

470 try: # size instance' attr values only 

471 z += _zR(s, o.__dict__.values()) 

472 except AttributeError: # None, int, etc. 

473 pass 

474 return z 

475 

476 return _zR(set(), (inst,)) 

477 

478 

479def splice(iterable, n=2, **fill): 

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

481 

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

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

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

485 

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

487 M{iterable[i::n] for i=0..n}. 

488 

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

490 

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

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

493 

494 @example: 

495 

496 >>> from pygeodesy import splice 

497 

498 >>> a, b = splice(range(10)) 

499 >>> a, b 

500 ((0, 2, 4, 6, 8), (1, 3, 5, 7, 9)) 

501 

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

503 >>> a, b, c 

504 ((0, 3, 6, 9), (1, 4, 7), (2, 5, 8)) 

505 

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

507 >>> a, b, c 

508 ((0, 3, 6, 9), (1, 4, 7, -1), (2, 5, 8, -1)) 

509 

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

511 ([0, 5], [1, 6], [2, 7], [3, 8], [4]) 

512 

513 >>> splice(range(9), n=1) 

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

515 ''' 

516 if not isint(n): 

517 raise _TypeError(n=n) 

518 

519 t = iterable 

520 if not isinstance(t, _list_tuple_types): 

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

522 

523 if n > 1: 

524 if fill: 

525 fill = _xkwds_get(fill, fill=MISSING) 

526 if fill is not MISSING: 

527 m = len(t) % n 

528 if m > 0: # same type fill 

529 t += type(t)((fill,) * (n - m)) 

530 for i in range(n): 

531 # XXX t[i::n] chokes PyChecker 

532 yield t[slice(i, None, n)] 

533 else: 

534 yield t 

535 

536 

537def _splituple(strs, *sep_splits): # in .mgrs, .osgr, .webmercator 

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

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

540 ''' 

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

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

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

544 

545 

546_XPACKAGES = _splituple(_getenv(_PYGEODESY_XPACKAGES_, NN)) 

547 

548 

549def unsigned0(x): 

550 '''Unsign if C{0.0}. 

551 

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

553 ''' 

554 return x if x else _0_0 

555 

556 

557def _xargs_names(callabl): 

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

559 ''' 

560 try: 

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

562 except AttributeError: # .signature new Python 3+ 

563 args_kwds = _inspect.getargspec(callabl).args 

564 return tuple(args_kwds) 

565 

566 

567def _xcopy(inst, deep=False): 

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

569 

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

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

572 a shallow copy (C{bool}). 

573 

574 @return: The copy of B{C{inst}}. 

575 ''' 

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

577 

578 

579def _xdup(inst, **items): 

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

581 

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

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

584 

585 @return: Shallow duplicate of B{C{inst}} with modified 

586 attributes, if any B{C{items}}. 

587 

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

589 ''' 

590 d = _xcopy(inst, deep=False) 

591 for n, v in items.items(): 

592 if not hasattr(d, n): 

593 t = _MODS.named.classname(inst) 

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

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

596 setattr(d, n, v) 

597 return d 

598 

599 

600def _xgeographiclib(where, *required): 

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

602 ''' 

603 try: 

604 _xpackage(_xgeographiclib) 

605 import geographiclib 

606 except ImportError as x: 

607 raise _xImportError(x, where) 

608 return _xversion(geographiclib, where, *required) 

609 

610 

611def _xImportError(x, where, **name): 

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

613 ''' 

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

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

616 

617 

618def _xinstanceof(*Types, **name_value_pairs): 

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

620 

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

622 all positional. 

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

624 with the C{value} to be checked. 

625 

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

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

628 ''' 

629 if Types and name_value_pairs: 

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

631 if not isinstance(v, Types): 

632 raise _TypesError(n, v, *Types) 

633 else: 

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

635 

636 

637def _xnumpy(where, *required): 

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

639 ''' 

640 try: 

641 _xpackage(_xnumpy) 

642 import numpy 

643 except ImportError as x: 

644 raise _xImportError(x, where) 

645 return _xversion(numpy, where, *required) 

646 

647 

648def _xpackage(_xpkg): 

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

650 ''' 

651 n = _xpkg.__name__[2:] 

652 if n in _XPACKAGES: 

653 x = _SPACE_(n, _in_, _PYGEODESY_XPACKAGES_) 

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

655 raise ImportError(_EQUAL_(x, e)) 

656 

657 

658def _xor(x, *xs): 

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

660 ''' 

661 for x_ in xs: 

662 x ^= x_ 

663 return x 

664 

665 

666def _xscipy(where, *required): 

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

668 ''' 

669 try: 

670 _xpackage(_xscipy) 

671 import scipy 

672 except ImportError as x: 

673 raise _xImportError(x, where) 

674 return _xversion(scipy, where, *required) 

675 

676 

677def _xsubclassof(*Classes, **name_value_pairs): 

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

679 

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

681 all positional. 

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

683 with the C{value} to be checked. 

684 

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

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

687 ''' 

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

689 if not issubclassof(v, *Classes): 

690 raise _TypesError(n, v, *Classes) 

691 

692 

693def _xversion(package, where, *required, **name): 

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

695 ''' 

696 n = len(required) 

697 if n: 

698 t = _xversion_info(package) 

699 if t[:n] < required: 

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

701 _below_, _DOT_(*required), 

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

703 raise ImportError(t) 

704 return package 

705 

706 

707def _xversion_info(package): # in .karney 

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

709 3-tuple C{(major, minor, revision)} if C{int}s. 

710 ''' 

711 try: 

712 t = package.__version_info__ 

713 except AttributeError: 

714 t = package.__version__.strip() 

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

716 return map2(int, t) 

717 

718 

719def _xwhere(where, **name): 

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

721 ''' 

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

723 if name: 

724 n = _xkwds_get(name, name=NN) 

725 if n: 

726 m = _DOT_(m, n) 

727 return m 

728 

729 

730if _sys_version_info2 < (3, 10): # see .errors 

731 _zip = zip # PYCHOK exported 

732else: # Python 3.10+ 

733 

734 def _zip(*args): 

735 return zip(*args, strict=True) 

736 

737# **) MIT License 

738# 

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

740# 

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

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

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

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

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

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

747# 

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

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

750# 

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

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

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

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

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

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

757# OTHER DEALINGS IN THE SOFTWARE.