Coverage for pygeodesy/streprs.py: 96%
272 statements
« prev ^ index » next coverage.py v7.2.2, created at 2024-03-10 16:39 -0400
« prev ^ index » next coverage.py v7.2.2, created at 2024-03-10 16:39 -0400
2# -*- coding: utf-8 -*-
4u'''Floating point and other formatting utilities.
5'''
7from pygeodesy.basics import isint, islistuple, isscalar, isstr, itemsorted, \
8 _zip, _0_0
9# from pygeodesy.constants import _0_0
10from pygeodesy.errors import _AttributeError, _IsnotError, _or, _TypeError, \
11 _ValueError, _xkwds_get, _xkwds_pop2
12from 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_
16from pygeodesy.interns import _convergence_, _distant_, _e_, _eps_, _exceeds_, \
17 _EQUALSPACED_, _f_, _F_, _g_, _limit_, _no_, \
18 _tolerance_ # PYCHOK used!
19from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS, _getenv
21from math import fabs, log10 as _log10
23__all__ = _ALL_LAZY.streprs
24__version__ = '24.02.20'
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!
33class _Fmt(str): # in .streprs
34 '''(INTERNAL) Callable formatting.
35 '''
36 name = NN
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
54# def __mod__(self, arg, **unused):
55# '''Regular C{%} operator.
56# '''
57# return str.__mod__(self, arg)
60class Fstr(str):
61 '''(INTERNAL) C{float} format.
62 '''
63 name = NN
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
73 def __mod__(self, arg, **unused):
74 '''Regular C{%} operator.
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)}.
80 @raise TypeError: Non-scalar B{C{arg}} value.
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))
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))
98 if not isscalar(arg):
99 raise _TypeError(_error(arg))
100 return self(arg, prec=prec)
103class _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)
112class 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
151 def __init__(self):
152 for n, a in self.__class__.__dict__.items():
153 if isinstance(a, (Fstr, _Fmt)):
154 setattr(a, _name_, n)
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))
162 def INDEX(self, name, i=None):
163 return name if i is None else self.SQUARE(name, i)
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)
173Fmt = Fmt() # PYCHOK singleton
174Fmt.__name__ = Fmt.__class__.__name__
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
184def anstr(name, OKd=_OKd_, sub=_UNDER_):
185 '''Make a valid name of alphanumeric and OKd characters.
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}).
191 @return: The modified name (C{str}).
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())
204def 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}.
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.
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
222 def _Nones_kwds(Nones=True, **kwds):
223 return Nones, kwds
225 Nones, kwds = _Nones_kwds(**Nones_True__pairs_kwds)
226 return pairs(_items(inst, names, Nones), **kwds)
229def enstr2(easting, northing, prec, *extras, **wide_dot):
230 '''Return an MGRS/OSGR easting, northing string representations.
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.
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}}.
244 @raise ValueError: Invalid B{C{easting}}, B{C{northing}} or B{C{prec}}.
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
263if enstr2.__doc__: # PYCHOK expected
264 enstr2.__doc__ %= (_EN_WIDE,)
267def _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
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
286def 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.
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.
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))
311def _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
322def _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
333def fstrzs(efstr, ap1z=False):
334 '''Strip trailing zero decimals from a C{float} string.
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}).
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:])
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:])
365 return efstr
368def hstr(height, prec=2, fmt=Fmt.h, ints=False, m=NN):
369 '''Return a string for the height value.
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
383def instr(inst, *args, **kwds):
384 '''Return the string representation of an instantiation.
386 @arg inst: The instance (any C{type}).
387 @arg args: Optional positional arguments.
388 @kwarg kwds: Optional keyword arguments.
390 @return: Representation (C{str}).
391 '''
392 return unstr(_MODS.named.classname(inst), *args, **kwds)
395def lrstrip(txt, lrpairs=_LR_PAIRS):
396 '''Left- I{and} right-strip parentheses, brackets, etc. from a string.
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).
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
414def 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}.
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}).
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
440def _pct(fmt):
441 '''(INTERNAL) Prefix C{%} if needed.
442 '''
443 return fmt if _PERCENT_ in fmt else NN(_PERCENT_, fmt)
446def reprs(objs, prec=6, fmt=Fmt.F, ints=False):
447 '''Convert objects to C{repr} strings, with C{float}s handled like L{fstr}.
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}).
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 ()
461def _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)
473def _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)
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
490 else:
491 raise _ValueError(fmt=fmt, txt=_not_(repr(_Fspec_)))
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
509def strs(objs, prec=6, fmt=Fmt.F, ints=False):
510 '''Convert objects to C{str} strings, with C{float}s handled like L{fstr}.
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}).
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 ()
524def unstr(where, *args, **kwds):
525 '''Return the string representation of an invokation.
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}.
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))
544def _0wd(*w_i): # in .osgr, .wgrs
545 '''(INTERNAL) Int formatter'.
546 '''
547 return '%0*d' % w_i
550def _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
559def _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
565def _xattrs(insto, other, *attrs): # see .errors._xattr
566 '''(INTERNAL) Copy attribute values from B{C{other}} to B{C{insto}}.
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).
572 @return: Object B{C{insto}}, updated.
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)
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
594def _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
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,
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