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# -*- coding: utf-8 -*- 

 

u'''Lazily import C{pygeodesy} modules and attributes, based on 

U{lazy_import<https://modutil.ReadTheDocs.io/en/latest/#lazy_import>} 

from I{Brett Cannon}'s U{modutil<https://PyPI.org/project/modutil>}. 

 

C{Lazy import} is I{supported only for }U{Python 3.7+ 

<https://Snarky.CA/lazy-importing-in-python-3-7>} and is I{enabled by 

default in }U{PyGeodesy 18.11.10+<https://PyPI.org/project/PyGeodesy>} 

I{ and later}. 

 

To I{enable} C{lazy import}, set C{env} variable C{PYGEODESY_LAZY_IMPORT} 

to C{1}, C{2}, C{3} or higher prior to C{import pygeodesy}. To I{disable} 

C{lazy import}, set C{env} variable C{PYGEODESY_LAZY_IMPORT} to C{0} or 

an empty string. Use C{2} or higher to print a message for each lazily 

imported module and attribute, similar to C{env} variable C{PYTHONVERBOSE} 

showing imports. Using C{3} or higher also shows the importing file name 

and line number. 

 

@note: C{Lazy import} applies only to top-level modules of C{pygeodesy}. 

A C{lazy import} of a top-level module inherently loads all sub-modules 

imported by that top-level module. 

''' 

from pygeodesy.interns import MISSING, NN, __all__ as _interns_a_l_l_, \ 

_areaOf_, _attribute_, _COMMASPACE_, \ 

_doesn_t_exist_, _DOT_, _dunder_name, \ 

_enabled_, _EQUALSPACED_, _immutable_, \ 

_isclockwise_, _ispolar_, _module_, \ 

_NL_, _no_, _not_, _or_, _perimeterOf_, \ 

_Python_, _pygeodesy_abspath_, _sep_, \ 

_SPACE_, _UNDER_, _version_ 

 

from os import getenv as _getenv # in .errors, .geodsolve, .props, .units 

from os.path import basename as _basename 

import sys as _sys # in .props 

try: 

from importlib import import_module 

except ImportError: # no import_module in Python 2.6- 

 

def import_module(name, package=None): # PYCHOK 

raise LazyImportError(name=name, package=package, 

txt=_no_(import_module.__name__)) 

 

_a_l_l_ = '__all__' 

_FOR_DOCS = _getenv('PYGEODESY_FOR_DOCS', NN) # for epydoc ... 

_imports_ = 'imports' 

_p_a_c_k_a_g_e_ = '__package__' 

_PYGEODESY_LAZY_IMPORT_ = 'PYGEODESY_LAZY_IMPORT' 

_PYTHON_X_DEV = getattr(_sys, '_xoptions', {}).get('dev', # Python 3.2 

_getenv('PYTHONDEVMODE', NN)) # PYCHOK exported 

_sub_packages = 'deprecated' , 'geodesicx' 

_sys_version_info2 = _sys.version_info[:2] # in .fmath, .geodsolve 

 

# @module_property[_RO?] <https://GitHub.com/jtushman/proxy_tools/> 

isLazy = None # see @var isLazy 

 

 

class LazyImportError(ImportError): 

'''Raised if C{lazy import} is not supported, disabled or failed some other way. 

''' 

def __init__(self, *name_value, **txt): 

from pygeodesy.errors import _error_init 

_error_init(ImportError, self, name_value, **txt) 

 

 

class _Dict(dict): 

'''(INTERNAL) Imports C{dict}. 

''' 

def add(self, key, value, *values): 

'''Add C{[key] = value}, typically C{[attr] = mod}. 

 

@raise AssertionError: The B{C{key}} already 

exists with different 

B{C{value}}. 

''' 

if key in self: 

val = self[key] # duplicate OK 

if val != value and val not in values: # PYCHOK no cover 

from pygeodesy.streprs import Fmt as _Fmt 

t = _Fmt.SQUARE(_imports_, key), val, value 

raise AssertionError('%s: %r, not %r' % t) 

else: 

self[key] = value 

 

 

class _NamedEnum_RO(dict): 

'''(INTERNAL) C{Read_Only} enum-like C{dict} sub-class. 

''' 

# _name = NN # also first kwd, __init__(_name=...) 

 

def _DOT_(self, attr): 

return _DOT_(self._name, attr) # PYCHOK _name 

 

def __getattr__(self, attr): 

try: 

return self[attr] 

except KeyError: 

from pygeodesy.errors import _AttributeError 

raise _AttributeError(self._DOT_(attr), txt=_doesn_t_exist_) 

 

def __setattr__(self, attr, value): # PYCHOK no cover 

from pygeodesy.errors import _TypeError 

t = _EQUALSPACED_(self._DOT_(attr), value) 

raise _TypeError(t, txt=_immutable_) 

 

def enums(self): 

for k, v in dict.items(self): 

if not k.startswith(_UNDER_): # skip _name 

yield k, v 

 

 

_ALL_INIT = _pygeodesy_abspath_, _version_ 

 

# __all__ value for most modules, accessible as _ALL_LAZY.<module> 

_ALL_LAZY = _NamedEnum_RO(_name='_ALL_LAZY', 

albers=('AlbersEqualArea', 'AlbersEqualArea2', 'AlbersEqualArea4', 

'AlbersEqualAreaCylindrical', 'AlbersEqualAreaNorth', 'AlbersEqualAreaSouth', 

'AlbersError', 'Albers7Tuple'), 

azimuthal=('AzimuthalError', 'Azimuthal7Tuple', 

'Equidistant', 'EquidistantExact', 'EquidistantGeodSolve', 'EquidistantKarney', 

'Gnomonic', 'GnomonicExact', 'GnomonicGeodSolve', 'GnomonicKarney', 

'LambertEqualArea', 'Orthographic', 'Stereographic', 

'equidistant', 'gnomonic'), 

basics=('clips', 'copysign0', 'copytype', 'halfs2', 

'isbool', 'isclass', 'isfinite', 'isidentifier', 'isinf', 'isint', 'iskeyword', 

'isnan', 'isnear0', 'isnear1', 'isneg0', 'isnon0', 'isodd', 'isscalar', 'issequence', 'isstr', 'issubclassof', 

'len2', 'map1', 'map2', 'neg', 'neg_', 

'signOf', 'splice', 'ub2str', 'unsign0'), 

clipy=('ClipError', 

'ClipCS4Tuple', 'ClipLB6Tuple', 'ClipSH3Tuple', 

'clipCS4', 'clipLB6', 'clipSH', 'clipSH3'), 

css=('CassiniSoldner', 'Css', 'CSSError', 'toCss', 

'EasNorAziRk4Tuple', 'LatLonAziRk4Tuple'), 

datums=('Datum', 'Datums', 'Transform', 'Transforms'), 

deprecated=('OK', # DEPRECATED constants 

'bases', 'datum', 'nvector', # DEPRECATED modules 

'ClipCS3Tuple', 'EcefCartesian', 'HeightIDW', 'HeightIDW2', 'HeightIDW3', 'RefFrameError', 'UtmUps4Tuple', # DEPRECATED classes 

'anStr', 'areaof', 'bounds', 'clipCS3', 'clipDMS', 'clipStr', 'decodeEPSG2', 'encodeEPSG', # most of the DEPRECATED functions, ... 

'equirectangular3', 'enStr2', 'false2f', 'falsed2f', 'fStr', 'fStrzs', # ... except ellipsoidal, spherical flavors 

'hypot3', 'inStr', 'isenclosedby', 'joined', 'joined_', 

'nearestOn3', 'nearestOn4', 'parseUTM', 'perimeterof', 'polygon', 

'scalar', 'simplify2', 'toUtm', 'unStr', 'utmZoneBand2'), 

dms=('F_D', 'F_DM', 'F_DMS', 'F_DEG', 'F_MIN', 'F_SEC', 'F_D60', 'F__E', 'F__F', 'F__G', 'F_RAD', 

'F_D_', 'F_DM_', 'F_DMS_', 'F_DEG_', 'F_MIN_', 'F_SEC_', 'F_D60_', 'F__E_', 'F__F_', 'F__G_', 'F_RAD_', 

'F_D__', 'F_DM__', 'F_DMS__', 'F_DEG__', 'F_MIN__', 'F_SEC__', 'F_D60__', 'F__E__', 'F__F__', 'F__G__', 'F_RAD__', 

'S_DEG', 'S_MIN', 'S_SEC', 'S_RAD', 'S_SEP', 'ParseError', 

'bearingDMS', 'clipDegrees', 'clipRadians', 'compassDMS', 'compassPoint', 

'degDMS', 'latDMS', 'latlonDMS', 'latlonDMS_', 'lonDMS', 'normDMS', 

'parseDDDMMSS', 'parseDMS', 'parseDMS2', 'parse3llh', 'parseRad', 'precision', 'toDMS'), 

ecef=('EcefError', 'EcefFarrell21', 'EcefFarrell22', 'EcefKarney', 'EcefMatrix', 

'EcefSudano', 'Ecef9Tuple', 'EcefVeness', 'EcefYou'), 

elevations=('Elevation2Tuple', 'GeoidHeight2Tuple', 

'elevation2', 'geoidHeight2'), 

ellipsoidalExact=(), # module only 

ellipsoidalGeodSolve=(), # module only 

ellipsoidalKarney=(), # module only 

ellipsoidalNvector=('Ned3Tuple',), # nothing else 

ellipsoidalVincenty=('VincentyError',), # nothing else 

ellipsoids=('R_M', 'R_MA', 'R_MB', 'R_KM', 'R_NM', 'R_SM', 'R_FM', 'R_GM', 'R_VM', 

'a_f2Tuple', 'Circle4Tuple', 'Curvature2Tuple', 

'Ellipsoid', 'Ellipsoid2', 'Ellipsoids', 

'a_b2e', 'a_b2e2', 'a_b2e22', 'a_b2e32', 'a_b2f', 'a_b2f_', 'a_b2f2', 'a_b2n', 

'a_f2b', 'a_f_2b', 'b_f2a', 'b_f_2a', 

'f2e2', 'f2e22', 'f2e32', 'f_2f', 'f2f_', 'f2f2', 'f2n', 'n2e2', 'n2f', 'n2f_'), 

elliptic=('Elliptic', 'EllipticError', 'Elliptic3Tuple'), 

epsg=('Epsg', 'EPSGError'), 

errors=('CrossError', 'IntersectionError', 'NumPyError', 'LenError', 'LimitError', 'PointsError', 

'RangeError', 'ResectionError', 'SciPyError', 'SciPyWarning', 'TRFError', 'TriangleError', 

'UnitError', 'VectorError', 

'crosserrors', 'exception_chaining', 'limiterrors', 'rangerrors'), 

etm=('Etm', 'ETMError', 'ExactTransverseMercator', 

'EasNorExact4Tuple', 'LatLonExact4Tuple', 

'parseETM5', 'toEtm8'), 

fmath=('Fdot', 'Fhorner', 'Fpolynomial', 'Fsum', 

'cbrt', 'cbrt2', 'euclid', 'euclid_', 

'facos1', 'fasin1', 'fatan', 'fatan1', 'fatan2', 'favg', 

'fdot', 'fdot3', 'fmean', 'fmean_', 'fhorner', 'fidw', 'fpolynomial', 

'fpowers', 'fprod', 'frange', 'freduce', 'fsum', 'fsum_', 'fsum1', 'fsum1_', 

'hypot', 'hypot_', 'hypot1', 'hypot2', 'hypot2_', 

'norm2', 'norm_', 'sqrt0', 'sqrt3'), 

formy=('Radical2Tuple', 

'antipode', 'antipode_', 'bearing', 'bearing_', 

'compassAngle', 'cosineForsytheAndoyerLambert', 'cosineForsytheAndoyerLambert_', 

'cosineAndoyerLambert', 'cosineAndoyerLambert_', 'cosineLaw', 'cosineLaw_', 

'equirectangular', 'equirectangular_', 'euclidean', 'euclidean_', 

'excessAbc', 'excessGirard', 'excessLHuilier', 

'excessKarney', 'excessKarney_', 'excessQuad', 'excessQuad_', 

'flatLocal', 'flatLocal_', 'flatPolar', 'flatPolar_', 

'hartzell', 'haversine', 'haversine_', 'heightOf', 'horizon', 'hubeny', 'hubeny_', 

'intersections2', 'isantipode', 'isantipode_', 

'latlon2n_xyz', 'n_xyz2latlon', 'n_xyz2philam', 

'opposing', 'opposing_', 'philam2n_xyz', 

'radical2', 'thomas', 'thomas_', 'vincentys', 'vincentys_'), 

frechet=('Frechet', 'FrechetDegrees', 'FrechetError', 'FrechetRadians', 

'FrechetCosineAndoyerLambert', 'FrechetCosineForsytheAndoyerLambert', 

'FrechetCosineLaw', 'FrechetDistanceTo', 'FrechetEquirectangular', 

'FrechetEuclidean', 'FrechetExact', 'FrechetFlatLocal', 'FrechetFlatPolar', 

'FrechetHaversine', 'FrechetHubeny', 'FrechetKarney', 'FrechetThomas', 

'FrechetVincentys', 'Frechet6Tuple', 

'frechet_'), 

gars=('Garef', 'GARSError'), 

geodesicx=('gx', 'gxarea', 'gxline', # modules 

'Caps', 'GeodesicAreaExact', 'GeodesicExact', 'GeodesicLineExact', 'PolygonArea'), 

geodsolve=('GeodesicSolve', 'GeodesicLineSolve'), 

geohash=('Geohash', 'GeohashError', 'Neighbors8Dict', 'Resolutions2Tuple'), 

geoids=('GeoidError', 'GeoidG2012B', 'GeoidKarney', 'GeoidPGM', 'egmGeoidHeights', 

'PGMError', 'GeoidHeight5Tuple'), 

hausdorff=('Hausdorff', 'HausdorffDegrees', 'HausdorffError', 'HausdorffRadians', 

'HausdorffCosineAndoyerLambert', 'HausdorffCosineForsytheAndoyerLambert', 

'HausdorffCosineLaw', 'HausdorffDistanceTo', 'HausdorffEquirectangular', 

'HausdorffEuclidean', 'HausdorffExact', 'HausdorffFlatLocal', 'HausdorffFlatPolar', 

'HausdorffHaversine', 'HausdorffHubeny', 'HausdorffKarney', 'HausdorffThomas', 

'HausdorffVincentys', 'Hausdorff6Tuple', 

'hausdorff_', 'randomrangenerator'), 

heights=('HeightError', 

'HeightIDWcosineAndoyerLambert', 'HeightIDWcosineForsytheAndoyerLambert', 

'HeightIDWcosineLaw', 'HeightIDWdistanceTo', 'HeightIDWequirectangular', 

'HeightIDWeuclidean', 'HeightIDWflatLocal', 'HeightIDWflatPolar', 'HeightIDWhaversine', 

'HeightIDWhubeny', 'HeightIDWkarney', 'HeightIDWthomas', 'HeightIDWvincentys', 

'HeightCubic', 'HeightLinear', 'HeightLSQBiSpline', 'HeightSmoothBiSpline'), 

interns=_interns_a_l_l_, 

iters=('LatLon2PsxyIter', 'PointsIter', 'points2', 

'isNumpy2', 'isPoints2', 'isTuple2', 'iterNumpy2', 'iterNumpy2over'), 

karney=('Direct9Tuple', 'GDict', 'GeodesicError', 'GeodSolve12Tuple', 'Inverse10Tuple'), 

lazily=('LazyImportError', 'isLazy', 'print_', 'printf'), 

lcc=('Conic', 'Conics', 'Lcc', 'LCCError', 'toLcc'), 

ltp=('Attitude', 'AttitudeError', 'Frustum', 'LocalCartesian', 'LocalError', 'Ltp', 'tyr3d'), 

ltpTuples=('Aer', 'Aer4Tuple', 'Attitude4Tuple', 'Enu', 'Enu4Tuple', 'Footprint5Tuple', 

'Local9Tuple', 'Ned', 'Ned4Tuple', 'XyzLocal', 'Xyz4Tuple'), 

mgrs=('Mgrs', 'MGRSError', 'parseMGRS', 'toMgrs', 'Mgrs4Tuple', 'Mgrs6Tuple'), 

named=('callername', 'classname', 'classnaming', 'modulename', 'nameof', 'notImplemented', 'notOverloaded'), 

namedTuples=('Bearing2Tuple', 'Bounds2Tuple', 'Bounds4Tuple', 

'Destination2Tuple', 'Destination3Tuple', 

'Distance2Tuple', 'Distance3Tuple', 'Distance4Tuple', 

'EasNor2Tuple', 'EasNor3Tuple', 'Intersection3Tuple', 

'LatLon2Tuple', 'LatLon3Tuple', 'LatLon4Tuple', 

'LatLonDatum3Tuple', 'LatLonDatum5Tuple', 

'LatLonPrec3Tuple', 'LatLonPrec5Tuple', 

'NearestOn2Tuple', 'NearestOn3Tuple', 'NearestOn5Tuple', 'NearestOn6Tuple', 'NearestOn8Tuple', 

'PhiLam2Tuple', 'PhiLam3Tuple', 'PhiLam4Tuple', 'Point3Tuple', 'Points2Tuple', 

'Triangle7Tuple', 'Triangle8Tuple', 'Trilaterate5Tuple', 

'UtmUps2Tuple', 'UtmUps5Tuple', 'UtmUps8Tuple', 'UtmUpsLatLon5Tuple', 

'Vector2Tuple', 'Vector3Tuple', 'Vector4Tuple'), 

osgr=('Osgr', 'OSGRError', 'parseOSGR', 'toOsgr'), 

points=('LatLon_', 'LatLon2psxy', 'Numpy2LatLon', 'Shape2Tuple', 'Tuple2LatLon', 

_areaOf_, 'boundsOf', 'centroidOf', 'fractional', 

_isclockwise_, 'isconvex', 'isconvex_', 'isenclosedBy', _ispolar_, 

'luneOf', 'nearestOn5', _perimeterOf_, 'quadOf'), 

props=('Property', 'Property_RO', 'property_RO', 'property_doc_', 

'deprecated_class', 'deprecated_function', 'deprecated_method', 

'deprecated_Property_RO', 'deprecated_property_RO', 'DeprecationWarnings'), 

resections=('Collins5Tuple', 'Survey3Tuple', 'Tienstra7Tuple', 

'TriAngle4Tuple', 'TriSide2Tuple', 'TriSide4Tuple', 

'cassini', 'collins', 'pierlot', 'tienstra', 

'snellius3', 'wildberger3', 

'triAngle', 'triAngle4', 'triSide', 'triSide2', 'triSide4'), 

sphericalNvector=(), # module only 

sphericalTrigonometry=(), # module only 

simplify=('simplify1', 'simplifyRDP', 'simplifyRDPm', 'simplifyRW', 'simplifyVW', 'simplifyVWm'), 

streprs=('anstr', 'attrs', 'enstr2', 'fstr', 'fstrzs', 'hstr', 'instr', 'pairs', 'reprs', 'strs', 'unstr'), 

trf=('RefFrame', 'RefFrames', 'Transform7Tuple', 

'date2epoch', 'epoch2date', 'trfXform'), 

units=('Band', 'Bearing', 'Bearing_', 'Bool', 

'Degrees', 'Degrees_', 'Degrees2', 'Distance', 'Distance_', 'Easting', 'Epoch', 

'Feet', 'FIx', 'Float', 'Float_', 'Height', 'Int', 'Int_', 

'Lam', 'Lam_', 'Lat', 'Lat_', 'Lon', 'Lon_', 

'Meter', 'Meter_', 'Meter2', 'Meter3', 'Northing', 'Number_', 

'Phi', 'Phi_', 'Precision_', 'Radians', 'Radians_', 'Radians2', 

'Radius', 'Radius_', 'Scalar', 'Scalar_', 'Str', 'Zone'), 

ups=('Ups', 'UPSError', 'parseUPS5', 'toUps8', 'upsZoneBand5'), 

utily=('acos1', 'acre2ha', 'acre2m2', 'asin1', 'atand', 'atan2b', 'atan2d', 

'chain2m', 'circle4', 'cot', 'cot_', 'cotd', 'cotd_', 

'degrees', 'degrees90', 'degrees180', 'degrees360', 'degrees2grades', 'degrees2m', 

# 'degrees2grades as degrees2gons', 

'fathom2m', 'ft2m', 'furlong2m', 

'grades', 'grades400', 'grades2degrees', 'grades2radians', 

# 'grades as gons', 'grades400 as gons400', 'grades2degrees as gons2degrees', 'grades2radians as gons2radians', 

'm2chain', 'm2degrees', 'm2fathom', 'm2ft', 'm2furlong', 

'm2km', 'm2NM', 'm2radians', 'm2SM', 'm2toise', 'm2yard', 

'radians', 'radiansPI', 'radiansPI2', 'radiansPI_2', 'radians2m', 

'sincos2', 'sincos2_', 'sincos2d', 'sincos2d_', 

'tand', 'tand_', 'tan_2', 'tanPI_2_2', 'toise2m', 

'unroll180', 'unrollPI', 

'wrap90', 'wrap180', 'wrap360', 'wrapPI_2','wrapPI', 'wrapPI2', 

'yard2m'), 

utm=('Utm', 'UTMError', 'parseUTM5', 'toUtm8', 'utmZoneBand5'), 

utmups=('UtmUps', 'UTMUPSError', 'parseUTMUPS5', 'toUtmUps8', 

'utmupsValidate', 'utmupsValidateOK', 'utmupsZoneBand5'), 

vector2d=('Circin6Tuple', 'Circum3Tuple', 'Circum4Tuple', 'Meeus2Tuple', 'Radii11Tuple', 'Soddy4Tuple', 

'circin6', 'circum3', 'circum4_', 'meeus2', 'radii11', 'soddy4'), 

vector3d=('Vector3d', 'intersection3d3', 'iscolinearWith', 'nearestOn', 'nearestOn6', 'parse3d', 

'trilaterate2d2', 'trilaterate3d2'), 

webmercator=('Wm', 'WebMercatorError', 'parseWM', 'toWm', 'EasNorRadius3Tuple'), 

wgrs=('Georef', 'WGRSError')) 

 

# DEPRECATED __all__ names overloading those in _ALL_LAZY.deprecated where 

# the new name is fully backward compatible in signature and return value 

_ALL_OVERRIDDEN = _NamedEnum_RO(_name='_ALL_OVERRIDING', # all DEPRECATED 

basics=('clips as clipStr',), 

fmath=('hypot_ as hypot3',), 

formy=('points2 as polygon',), 

heights=('HeightIDWequirectangular as HeightIDW2', 'HeightIDWeuclidean as HeightIDW', 

'HeightIDWhaversine as HeightIDW3'), 

points=('areaOf as areaof', 

'isenclosedBy as isenclosedby', 'perimeterOf as perimeterof'), 

simplify=('simplifyRW as simplify2',), 

streprs=('anstr as anStr', 'enstr2 as enStr2', 'fstr as fStr', 'fstrzs as fStrzs', 

'instr as inStr', 'unstr as unStr')) 

 

__all__ = _ALL_LAZY.lazily 

__version__ = '21.11.17' 

 

 

def _ALL_OTHER(*objs): 

'''(INTERNAL) List local objects for __all__. 

''' 

from pygeodesy import interns # PYCHOK import 

 

def _dun(o): 

n = _dunder_name(o).rsplit(_DOT_, 1)[-1] 

u = NN(_UNDER_, n, _UNDER_) 

return getattr(interns, u, n) 

 

return tuple(map(_dun, objs)) 

 

 

if _FOR_DOCS: 

_ALL_DOCS = _ALL_OTHER 

# (INTERNAL) Only export B{C{objs.__name__}} when making the 

# docs to force C{epydoc} to include certain classes, methods, 

# functions and other names in the documentation. Using the 

# C{epydoc --private ...} command line option tends to include 

# too much internal documentation. 

else: 

def _ALL_DOCS(*unused): 

return () 

 

 

def _all_imports(**more): 

'''(INTERNAL) Build C{dict} of all lazy imports. 

''' 

# imports naming conventions stored below - [<key>] = <from>: 

# import <module> - [<module>] = <module> 

# from <module> import <attr> - [<attr>] = <module> 

# from pygeodesy import <attr> - [<attr>] = <attr> 

# from <module> import <attr> as <name> - [<name>] = <module>.<attr> 

imports = _Dict() 

imports_add = imports.add 

 

for ALL in (_ALL_LAZY, _ALL_OVERRIDDEN, more): 

for mod, attrs in ALL.items(): 

if isinstance(attrs, tuple) and not mod.startswith(_UNDER_): 

imports_add(mod, mod) 

for attr in attrs: 

attr, _, as_attr = attr.partition(' as ') 

if as_attr: 

imports_add(as_attr, _DOT_(mod, attr), *_sub_packages) 

else: 

imports_add(attr, mod) 

return imports 

 

 

def _all_missing2(_all_): 

'''(INTERNAL) Get diffs between pygeodesy.__all__ and lazily._all_imports. 

''' 

_alzy = _all_imports(**_NamedEnum_RO((a, ()) for a in _ALL_INIT)) 

return ((_DOT_('lazily', _all_imports.__name__), _COMMASPACE_.join(a for a in _all_ if a not in _alzy)), 

(_DOT_('pygeodesy', _a_l_l_), _COMMASPACE_.join(a for a in _alzy if a not in _all_))) 

 

 

def _caller3(up): # in .named 

'''(INTERNAL) Get 3-tuple C{(caller name, file name, line number)} 

for the caller B{C{up}} stack frames in the Python call stack. 

''' 

# sys._getframe(1) ... 'importlib._bootstrap' line 1032, 

# may throw a ValueError('call stack not deep enough') 

f = _sys._getframe(up + 1) 

return (f.f_code.co_name, # caller name 

_basename(f.f_code.co_filename), # file name 

f.f_lineno) # line number 

 

 

def _lazy_import2(_pygeodesy_): # MCCABE 15 

'''Check for and set up C{lazy import}. 

 

@arg _pygeodesy_: The name of the package (C{str}) performing 

the imports, to help facilitate resolving 

relative imports, usually C{__package__}. 

 

@return: 2-Tuple C{(package, getattr)} of the importing package 

for easy reference within itself and the callable to 

be set to `__getattr__`. 

 

@raise LazyImportError: Lazy import not supported or not enabled, 

an import failed or the package name or 

module name or attribute name is invalid 

or does not exist. 

 

@note: This is the original function U{modutil.lazy_import 

<https://GitHub.com/brettcannon/modutil/blob/master/modutil.py>} 

modified to handle the C{__all__} and C{__dir__} attributes 

and call C{importlib.import_module(<module>.<name>, ...)} 

without causing a C{ModuleNotFoundError}. 

 

@see: The original U{modutil<https://PyPi.org/project/modutil>}, 

U{PEP 562<https://www.Python.org/dev/peps/pep-0562>} and the 

U{new way<https://Snarky.CA/lazy-importing-in-python-3-7/>}. 

''' 

if _sys_version_info2 < (3, 7): # not supported before 3.7 

t = _no_(_DOT_(_pygeodesy_, _lazy_import2.__name__)) 

raise LazyImportError(t, txt=_Python_(_sys)) 

 

package, parent = _lazy_init2(_pygeodesy_) 

 

packages = (parent, '__main__', NN) + tuple( 

_DOT_(parent, s) for s in _sub_packages) 

imports = _all_imports() 

 

def __getattr__(name): # __getattr__ only for Python 3.7+ 

# only called once for each undefined pygeodesy attribute 

if name in imports: 

# importlib.import_module() implicitly sets sub-modules 

# on this module as appropriate for direct imports (see 

# note in the _lazy_import.__doc__ above). 

mod, _, attr = imports[name].partition(_DOT_) 

if mod not in imports: 

raise LazyImportError(_no_(_module_), txt=_DOT_(parent, mod)) 

imported = import_module(_DOT_(_pygeodesy_, mod), parent) 

pkg = getattr(imported, _p_a_c_k_a_g_e_, None) 

if pkg not in packages: # invalid package 

raise LazyImportError(_DOT_(mod, _p_a_c_k_a_g_e_), pkg) 

# import the module or module attribute 

if attr: 

imported = getattr(imported, attr, MISSING) 

elif name != mod: 

imported = getattr(imported, name, MISSING) 

if imported is MISSING: 

raise LazyImportError(_no_(_attribute_), 

txt=_DOT_(mod, attr or name)) 

 

elif name in (_a_l_l_,): # XXX '_d_i_r_', '_m_e_m_b_e_r_s_'? 

imported = _ALL_INIT + tuple(imports.keys()) 

mod = NN 

else: 

raise LazyImportError(_no_(_module_, _or_, _attribute_), 

txt=_DOT_(parent, name)) 

 

setattr(package, name, imported) 

if isLazy > 1: 

z = NN 

if mod and mod != name: 

z = ' from .%s' % (mod,) 

if isLazy > 2: 

try: # see C{_caller3} 

_, f, s = _caller3(2) 

z = '%s by %s line %d' % (z, f, s) 

except ValueError: 

pass 

printf('# lazily imported %s%s', _DOT_(parent, name), z) 

 

return imported # __getattr__ 

 

return package, __getattr__ # _lazy_import2 

 

 

def _lazy_init2(_pygeodesy_): 

'''(INTERNAL) Try to initialize lazy import. 

 

@arg _pygeodesy_: The name of the package (C{str}) performing 

the imports, to help facilitate resolving 

relative imports, usually C{__package__}. 

 

@return: 3-Tuple C{(import_module, package, parent)} of module 

C{importlib.import_module}, the importing C{package} 

for easy reference within itself, always C{pygeodesy} 

and the package name, aka the C{parent}, always 

C{'pygeodesy'}. 

 

@raise LazyImportError: Lazy import not supported or not enabled, 

an import failed or the package name is 

invalid or does not exist. 

 

@note: Global C{isLazy} is set accordingly. 

''' 

global isLazy 

 

z = _getenv(_PYGEODESY_LAZY_IMPORT_, None) 

if z is None: # _PYGEODESY_LAZY_IMPORT_ not set 

isLazy = 1 # ... but on by default on 3.7 

else: 

z = z.strip() # like PYTHONVERBOSE et.al. 

isLazy = int(z) if z.isdigit() else (1 if z else 0) 

if isLazy < 1: # not enabled 

raise LazyImportError(_PYGEODESY_LAZY_IMPORT_, repr(z), txt=_not_(_enabled_)) 

if _getenv('PYTHONVERBOSE', None): # PYCHOK no cover 

isLazy += 1 

 

try: # to initialize in Python 3+ 

package = import_module(_pygeodesy_) 

parent = package.__spec__.parent # __spec__ only in Python 3.7+ 

if parent != _pygeodesy_: # assert 

t = _COMMASPACE_(parent, _not_(_pygeodesy_)) 

raise AttributeError(_EQUALSPACED_('parent', t)) 

 

except (AttributeError, ImportError) as x: 

isLazy = False # failed 

raise LazyImportError(_lazy_init2.__name__, _pygeodesy_, txt=str(x)) 

 

return package, parent 

 

 

def print_(*args, **nl_nt_prefix_end_file_flush_sep): 

'''Python 3-style C{print} function. 

 

@arg args: Values to be converted to C{str} and 

concatenated (C{any} types). 

@kwarg nl=0: Number of leading blank lines (C{int}). 

@kwarg nt=0: Number of additional , trailing blank lines (C{int}). 

@kwarg prefix=NN: To be inserted before the formatted text (C{str}). 

 

@note: Python 3+ keyword arguments C{end}, C{file} and C{flush} 

are silently ignored. 

''' 

sep = nl_nt_prefix_end_file_flush_sep.get(_sep_, _SPACE_) 

txt = sep.join(map(str, args)) 

printf(txt, **nl_nt_prefix_end_file_flush_sep) 

 

 

def printf(fmt, *args, **nl_nt_prefix_end_file_flush_sep): 

'''C-style C{printf} function. 

 

@arg fmt: C-style formating text (C{str}). 

@arg args: Values to be formatted (C{any} types). 

@kwarg nl=0: Number of leading blank lines (C{int}). 

@kwarg nt=0: Number of additional , trailing blank lines (C{int}). 

@kwarg prefix=NN: To be inserted before the formatted text (C{str}). 

 

@note: Python 3+ keyword arguments C{end}, C{file}, C{flush} 

and C{sep} are silently ignored. 

''' 

def _kwds(nl=0, nt=0, prefix=NN, **kwds): # XXX end? 

nl = (_NL_ * nl) if nl else NN 

nt = (_NL_ * nt) if nt else NN 

return nl, nt, prefix, kwds 

 

nl, nt, prefix, _ = _kwds(**nl_nt_prefix_end_file_flush_sep) 

if args: 

fmt %= args 

# elif kwds: 

# fmt %= kwds 

print(NN(nl, prefix, fmt, nt)) 

 

 

# **) MIT License 

# 

# Copyright (C) 2018-2021 -- mrJean1 at Gmail -- All Rights Reserved. 

# 

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

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

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

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

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

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

# 

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

# in all copies or substantial portions of the Software. 

# 

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

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

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

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

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

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

# OTHER DEALINGS IN THE SOFTWARE.