lib/yaml/constructor.py

   1
   2 __all__ = ['BaseConstructor', 'SafeConstructor', 'Constructor',
   3     'ConstructorError']
   4
   5 from error import *
   6 from nodes import *
   7
   8 import datetime
   9
  10 try:
  11     set
  12 except NameError:
  13     from sets import Set as set
  14
  15 import binascii, re, sys, types
  16
  17 class ConstructorError(MarkedYAMLError):
  18     pass
  19
  20 class BaseConstructor(object):
  21
  22     yaml_constructors = {}
  23     yaml_multi_constructors = {}
  24
  25     def __init__(self):
  26         self.constructed_objects = {}
  27         self.recursive_objects = {}
  28         self.state_generators = []
  29         self.deep_construct = False
  30
  31     def check_data(self):
  32         # If there are more documents available?
  33         return self.check_node()
  34
  35     def get_data(self):
  36         # Construct and return the next document.
  37         if self.check_node():
  38             return self.construct_document(self.get_node())
  39
  40     def construct_document(self, node):
  41         data = self.construct_object(node)
  42         while self.state_generators:
  43             state_generators = self.state_generators
  44             self.state_generators = []
  45             for generator in state_generators:
  46                 for dummy in generator:
  47                     pass
  48         self.constructed_objects = {}
  49         self.recursive_objects = {}
  50         self.deep_construct = False
  51         return data
  52
  53     def construct_object(self, node, deep=False):
  54         if deep:
  55             old_deep = self.deep_construct
  56             self.deep_construct = True
  57         if node in self.constructed_objects:
  58             return self.constructed_objects[node]
  59         if node in self.recursive_objects:
  60             raise ConstructorError(None, None,
  61                     "found unconstructable recursive node", node.start_mark)
  62         self.recursive_objects[node] = None
  63         constructor = None
  64         state_constructor = None
  65         tag_suffix = None
  66         if node.tag in self.yaml_constructors:
  67             constructor = self.yaml_constructors[node.tag]
  68         else:
  69             for tag_prefix in self.yaml_multi_constructors:
  70                 if node.tag.startswith(tag_prefix):
  71                     tag_suffix = node.tag[len(tag_prefix):]
  72                     constructor = self.yaml_multi_constructors[tag_prefix]
  73                     break
  74             else:
  75                 if None in self.yaml_multi_constructors:
  76                     tag_suffix = node.tag
  77                     constructor = self.yaml_multi_constructors[None]
  78                 elif None in self.yaml_constructors:
  79                     constructor = self.yaml_constructors[None]
  80                 elif isinstance(node, ScalarNode):
  81                     constructor = self.__class__.construct_scalar
  82                 elif isinstance(node, SequenceNode):
  83                     constructor = self.__class__.construct_sequence
  84                 elif isinstance(node, MappingNode):
  85                     constructor = self.__class__.construct_mapping
  86         if tag_suffix is None:
  87             data = constructor(self, node)
  88         else:
  89             data = constructor(self, tag_suffix, node)
  90         if isinstance(data, types.GeneratorType):
  91             generator = data
  92             data = generator.next()
  93             if self.deep_construct:
  94                 for dummy in generator:
  95                     pass
  96             else:
  97                 self.state_generators.append(generator)
  98         self.constructed_objects[node] = data
  99         del self.recursive_objects[node]
 100         if deep:
 101             self.deep_construct = old_deep
 102         return data
 103
 104     def construct_scalar(self, node):
 105         if not isinstance(node, ScalarNode):
 106             raise ConstructorError(None, None,
 107                     "expected a scalar node, but found %s" % node.id,
 108                     node.start_mark)
 109         return node.value
 110
 111     def construct_sequence(self, node, deep=False):
 112         if not isinstance(node, SequenceNode):
 113             raise ConstructorError(None, None,
 114                     "expected a sequence node, but found %s" % node.id,
 115                     node.start_mark)
 116         return [self.construct_object(child, deep=deep)
 117                 for child in node.value]
 118
 119     def construct_mapping(self, node, deep=False):
 120         if not isinstance(node, MappingNode):
 121             raise ConstructorError(None, None,
 122                     "expected a mapping node, but found %s" % node.id,
 123                     node.start_mark)
 124         mapping = {}
 125         for key_node, value_node in node.value:
 126             key = self.construct_object(key_node, deep=deep)
 127             try:
 128                 hash(key)
 129             except TypeError, exc:
 130                 raise ConstructorError("while constructing a mapping", node.start_mark,
 131                         "found unacceptable key (%s)" % exc, key_node.start_mark)
 132             value = self.construct_object(value_node, deep=deep)
 133             mapping[key] = value
 134         return mapping
 135
 136     def construct_pairs(self, node, deep=False):
 137         if not isinstance(node, MappingNode):
 138             raise ConstructorError(None, None,
 139                     "expected a mapping node, but found %s" % node.id,
 140                     node.start_mark)
 141         pairs = []
 142         for key_node, value_node in node.value:
 143             key = self.construct_object(key_node, deep=deep)
 144             value = self.construct_object(value_node, deep=deep)
 145             pairs.append((key, value))
 146         return pairs
 147
 148     def add_constructor(cls, tag, constructor):
 149         if not 'yaml_constructors' in cls.__dict__:
 150             cls.yaml_constructors = cls.yaml_constructors.copy()
 151         cls.yaml_constructors[tag] = constructor
 152     add_constructor = classmethod(add_constructor)
 153
 154     def add_multi_constructor(cls, tag_prefix, multi_constructor):
 155         if not 'yaml_multi_constructors' in cls.__dict__:
 156             cls.yaml_multi_constructors = cls.yaml_multi_constructors.copy()
 157         cls.yaml_multi_constructors[tag_prefix] = multi_constructor
 158     add_multi_constructor = classmethod(add_multi_constructor)
 159
 160 class SafeConstructor(BaseConstructor):
 161
 162     def construct_scalar(self, node):
 163         if isinstance(node, MappingNode):
 164             for key_node, value_node in node.value:
 165                 if key_node.tag == u'tag:yaml.org,2002:value':
 166                     return self.construct_scalar(value_node)
 167         return BaseConstructor.construct_scalar(self, node)
 168
 169     def flatten_mapping(self, node):
 170         merge = []
 171         index = 0
 172         while index < len(node.value):
 173             key_node, value_node = node.value[index]
 174             if key_node.tag == u'tag:yaml.org,2002:merge':
 175                 del node.value[index]
 176                 if isinstance(value_node, MappingNode):
 177                     self.flatten_mapping(value_node)
 178                     merge.extend(value_node.value)
 179                 elif isinstance(value_node, SequenceNode):
 180                     submerge = []
 181                     for subnode in value_node.value:
 182                         if not isinstance(subnode, MappingNode):
 183                             raise ConstructorError("while constructing a mapping",
 184                                     node.start_mark,
 185                                     "expected a mapping for merging, but found %s"
 186                                     % subnode.id, subnode.start_mark)
 187                         self.flatten_mapping(subnode)
 188                         submerge.append(subnode.value)
 189                     submerge.reverse()
 190                     for value in submerge:
 191                         merge.extend(value)
 192                 else:
 193                     raise ConstructorError("while constructing a mapping", node.start_mark,
 194                             "expected a mapping or list of mappings for merging, but found %s"
 195                             % value_node.id, value_node.start_mark)
 196             elif key_node.tag == u'tag:yaml.org,2002:value':
 197                 key_node.tag = u'tag:yaml.org,2002:str'
 198                 index += 1
 199             else:
 200                 index += 1
 201         if merge:
 202             node.value = merge + node.value
 203
 204     def construct_mapping(self, node, deep=False):
 205         if isinstance(node, MappingNode):
 206             self.flatten_mapping(node)
 207         return BaseConstructor.construct_mapping(self, node, deep=deep)
 208
 209     def construct_yaml_null(self, node):
 210         self.construct_scalar(node)
 211         return None
 212
 213     bool_values = {
 214         u'yes':     True,
 215         u'no':      False,
 216         u'true':    True,
 217         u'false':   False,
 218         u'on':      True,
 219         u'off':     False,
 220     }
 221
 222     def construct_yaml_bool(self, node):
 223         value = self.construct_scalar(node)
 224         return self.bool_values[value.lower()]
 225
 226     def construct_yaml_int(self, node):
 227         value = str(self.construct_scalar(node))
 228         value = value.replace('_', '')
 229         sign = +1
 230         if value[0] == '-':
 231             sign = -1
 232         if value[0] in '+-':
 233             value = value[1:]
 234         if value == '0':
 235             return 0
 236         elif value.startswith('0b'):
 237             return sign*int(value[2:], 2)
 238         elif value.startswith('0x'):
 239             return sign*int(value[2:], 16)
 240         elif value[0] == '0':
 241             return sign*int(value, 8)
 242         elif ':' in value:
 243             digits = [int(part) for part in value.split(':')]
 244             digits.reverse()
 245             base = 1
 246             value = 0
 247             for digit in digits:
 248                 value += digit*base
 249                 base *= 60
 250             return sign*value
 251         else:
 252             return sign*int(value)
 253
 254     inf_value = 1e300
 255     while inf_value != inf_value*inf_value:
 256         inf_value *= inf_value
 257     nan_value = -inf_value/inf_value   # Trying to make a quiet NaN (like C99).
 258
 259     def construct_yaml_float(self, node):
 260         value = str(self.construct_scalar(node))
 261         value = value.replace('_', '').lower()
 262         sign = +1
 263         if value[0] == '-':
 264             sign = -1
 265         if value[0] in '+-':
 266             value = value[1:]
 267         if value == '.inf':
 268             return sign*self.inf_value
 269         elif value == '.nan':
 270             return self.nan_value
 271         elif ':' in value:
 272             digits = [float(part) for part in value.split(':')]
 273             digits.reverse()
 274             base = 1
 275             value = 0.0
 276             for digit in digits:
 277                 value += digit*base
 278                 base *= 60
 279             return sign*value
 280         else:
 281             return sign*float(value)
 282
 283     def construct_yaml_binary(self, node):
 284         value = self.construct_scalar(node)
 285         try:
 286             return str(value).decode('base64')
 287         except (binascii.Error, UnicodeEncodeError), exc:
 288             raise ConstructorError(None, None,
 289                     "failed to decode base64 data: %s" % exc, node.start_mark)
 290
 291     timestamp_regexp = re.compile(
 292             ur'''^(?P<year>[0-9][0-9][0-9][0-9])
 293                 -(?P<month>[0-9][0-9]?)
 294                 -(?P<day>[0-9][0-9]?)
 295                 (?:(?:[Tt]|[ \t]+)
 296                 (?P<hour>[0-9][0-9]?)
 297                 :(?P<minute>[0-9][0-9])
 298                 :(?P<second>[0-9][0-9])
 299                 (?:\.(?P<fraction>[0-9]*))?
 300                 (?:[ \t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?)
 301                 (?::(?P<tz_minute>[0-9][0-9]))?))?)?$''', re.X)
 302
 303     def construct_yaml_timestamp(self, node):
 304         value = self.construct_scalar(node)
 305         match = self.timestamp_regexp.match(node.value)
 306         values = match.groupdict()
 307         year = int(values['year'])
 308         month = int(values['month'])
 309         day = int(values['day'])
 310         if not values['hour']:
 311             return datetime.date(year, month, day)
 312         hour = int(values['hour'])
 313         minute = int(values['minute'])
 314         second = int(values['second'])
 315         fraction = 0
 316         if values['fraction']:
 317             fraction = int(values['fraction'][:6].ljust(6, '0'))
 318         delta = None
 319         if values['tz_sign']:
 320             tz_hour = int(values['tz_hour'])
 321             tz_minute = int(values['tz_minute'] or 0)
 322             delta = datetime.timedelta(hours=tz_hour, minutes=tz_minute)
 323             if values['tz_sign'] == '-':
 324                 delta = -delta
 325         data = datetime.datetime(year, month, day, hour, minute, second, fraction)
 326         if delta:
 327             data -= delta
 328         return data
 329
 330     def construct_yaml_omap(self, node):
 331         # Note: we do not check for duplicate keys, because it's too
 332         # CPU-expensive.
 333         omap = []
 334         yield omap
 335         if not isinstance(node, SequenceNode):
 336             raise ConstructorError("while constructing an ordered map", node.start_mark,
 337                     "expected a sequence, but found %s" % node.id, node.start_mark)
 338         for subnode in node.value:
 339             if not isinstance(subnode, MappingNode):
 340                 raise ConstructorError("while constructing an ordered map", node.start_mark,
 341                         "expected a mapping of length 1, but found %s" % subnode.id,
 342                         subnode.start_mark)
 343             if len(subnode.value) != 1:
 344                 raise ConstructorError("while constructing an ordered map", node.start_mark,
 345                         "expected a single mapping item, but found %d items" % len(subnode.value),
 346                         subnode.start_mark)
 347             key_node, value_node = subnode.value[0]
 348             key = self.construct_object(key_node)
 349             value = self.construct_object(value_node)
 350             omap.append((key, value))
 351
 352     def construct_yaml_pairs(self, node):
 353         # Note: the same code as `construct_yaml_omap`.
 354         pairs = []
 355         yield pairs
 356         if not isinstance(node, SequenceNode):
 357             raise ConstructorError("while constructing pairs", node.start_mark,
 358                     "expected a sequence, but found %s" % node.id, node.start_mark)
 359         for subnode in node.value:
 360             if not isinstance(subnode, MappingNode):
 361                 raise ConstructorError("while constructing pairs", node.start_mark,
 362                         "expected a mapping of length 1, but found %s" % subnode.id,
 363                         subnode.start_mark)
 364             if len(subnode.value) != 1:
 365                 raise ConstructorError("while constructing pairs", node.start_mark,
 366                         "expected a single mapping item, but found %d items" % len(subnode.value),
 367                         subnode.start_mark)
 368             key_node, value_node = subnode.value[0]
 369             key = self.construct_object(key_node)
 370             value = self.construct_object(value_node)
 371             pairs.append((key, value))
 372
 373     def construct_yaml_set(self, node):
 374         data = set()
 375         yield data
 376         value = self.construct_mapping(node)
 377         data.update(value)
 378
 379     def construct_yaml_str(self, node):
 380         value = self.construct_scalar(node)
 381         try:
 382             return value.encode('ascii')
 383         except UnicodeEncodeError:
 384             return value
 385
 386     def construct_yaml_seq(self, node):
 387         data = []
 388         yield data
 389         data.extend(self.construct_sequence(node))
 390
 391     def construct_yaml_map(self, node):
 392         data = {}
 393         yield data
 394         value = self.construct_mapping(node)
 395         data.update(value)
 396
 397     def construct_yaml_object(self, node, cls):
 398         data = cls.__new__(cls)
 399         yield data
 400         if hasattr(data, '__setstate__'):
 401             state = self.construct_mapping(node, deep=True)
 402             data.__setstate__(state)
 403         else:
 404             state = self.construct_mapping(node)
 405             data.__dict__.update(state)
 406
 407     def construct_undefined(self, node):
 408         raise ConstructorError(None, None,
 409                 "could not determine a constructor for the tag %r" % node.tag.encode('utf-8'),
 410                 node.start_mark)
 411
 412 SafeConstructor.add_constructor(
 413         u'tag:yaml.org,2002:null',
 414         SafeConstructor.construct_yaml_null)
 415
 416 SafeConstructor.add_constructor(
 417         u'tag:yaml.org,2002:bool',
 418         SafeConstructor.construct_yaml_bool)
 419
 420 SafeConstructor.add_constructor(
 421         u'tag:yaml.org,2002:int',
 422         SafeConstructor.construct_yaml_int)
 423
 424 SafeConstructor.add_constructor(
 425         u'tag:yaml.org,2002:float',
 426         SafeConstructor.construct_yaml_float)
 427
 428 SafeConstructor.add_constructor(
 429         u'tag:yaml.org,2002:binary',
 430         SafeConstructor.construct_yaml_binary)
 431
 432 SafeConstructor.add_constructor(
 433         u'tag:yaml.org,2002:timestamp',
 434         SafeConstructor.construct_yaml_timestamp)
 435
 436 SafeConstructor.add_constructor(
 437         u'tag:yaml.org,2002:omap',
 438         SafeConstructor.construct_yaml_omap)
 439
 440 SafeConstructor.add_constructor(
 441         u'tag:yaml.org,2002:pairs',
 442         SafeConstructor.construct_yaml_pairs)
 443
 444 SafeConstructor.add_constructor(
 445         u'tag:yaml.org,2002:set',
 446         SafeConstructor.construct_yaml_set)
 447
 448 SafeConstructor.add_constructor(
 449         u'tag:yaml.org,2002:str',
 450         SafeConstructor.construct_yaml_str)
 451
 452 SafeConstructor.add_constructor(
 453         u'tag:yaml.org,2002:seq',
 454         SafeConstructor.construct_yaml_seq)
 455
 456 SafeConstructor.add_constructor(
 457         u'tag:yaml.org,2002:map',
 458         SafeConstructor.construct_yaml_map)
 459
 460 SafeConstructor.add_constructor(None,
 461         SafeConstructor.construct_undefined)
 462
 463 class Constructor(SafeConstructor):
 464
 465     def construct_python_str(self, node):
 466         return self.construct_scalar(node).encode('utf-8')
 467
 468     def construct_python_unicode(self, node):
 469         return self.construct_scalar(node)
 470
 471     def construct_python_long(self, node):
 472         return long(self.construct_yaml_int(node))
 473
 474     def construct_python_complex(self, node):
 475        return complex(self.construct_scalar(node))
 476
 477     def construct_python_tuple(self, node):
 478         return tuple(self.construct_sequence(node))
 479
 480     def find_python_module(self, name, mark):
 481         if not name:
 482             raise ConstructorError("while constructing a Python module", mark,
 483                     "expected non-empty name appended to the tag", mark)
 484         try:
 485             __import__(name)
 486         except ImportError, exc:
 487             raise ConstructorError("while constructing a Python module", mark,
 488                     "cannot find module %r (%s)" % (name.encode('utf-8'), exc), mark)
 489         return sys.modules[name]
 490
 491     def find_python_name(self, name, mark):
 492         if not name:
 493             raise ConstructorError("while constructing a Python object", mark,
 494                     "expected non-empty name appended to the tag", mark)
 495         if u'.' in name:
 496             # Python 2.4 only
 497             #module_name, object_name = name.rsplit('.', 1)
 498             items = name.split('.')
 499             object_name = items.pop()
 500             module_name = '.'.join(items)
 501         else:
 502             module_name = '__builtin__'
 503             object_name = name
 504         try:
 505             __import__(module_name)
 506         except ImportError, exc:
 507             raise ConstructorError("while constructing a Python object", mark,
 508                     "cannot find module %r (%s)" % (module_name.encode('utf-8'), exc), mark)
 509         module = sys.modules[module_name]
 510         if not hasattr(module, object_name):
 511             raise ConstructorError("while constructing a Python object", mark,
 512                     "cannot find %r in the module %r" % (object_name.encode('utf-8'),
 513                         module.__name__), mark)
 514         return getattr(module, object_name)
 515
 516     def construct_python_name(self, suffix, node):
 517         value = self.construct_scalar(node)
 518         if value:
 519             raise ConstructorError("while constructing a Python name", node.start_mark,
 520                     "expected the empty value, but found %r" % value.encode('utf-8'),
 521                     node.start_mark)
 522         return self.find_python_name(suffix, node.start_mark)
 523
 524     def construct_python_module(self, suffix, node):
 525         value = self.construct_scalar(node)
 526         if value:
 527             raise ConstructorError("while constructing a Python module", node.start_mark,
 528                     "expected the empty value, but found %r" % value.encode('utf-8'),
 529                     node.start_mark)
 530         return self.find_python_module(suffix, node.start_mark)
 531
 532     class classobj: pass
 533
 534     def make_python_instance(self, suffix, node,
 535             args=None, kwds=None, newobj=False):
 536         if not args:
 537             args = []
 538         if not kwds:
 539             kwds = {}
 540         cls = self.find_python_name(suffix, node.start_mark)
 541         if newobj and isinstance(cls, type(self.classobj))  \
 542                 and not args and not kwds:
 543             instance = self.classobj()
 544             instance.__class__ = cls
 545             return instance
 546         elif newobj and isinstance(cls, type):
 547             return cls.__new__(cls, *args, **kwds)
 548         else:
 549             return cls(*args, **kwds)
 550
 551     def set_python_instance_state(self, instance, state):
 552         if hasattr(instance, '__setstate__'):
 553             instance.__setstate__(state)
 554         else:
 555             slotstate = {}
 556             if isinstance(state, tuple) and len(state) == 2:
 557                 state, slotstate = state
 558             if hasattr(instance, '__dict__'):
 559                 instance.__dict__.update(state)
 560             elif state:
 561                 slotstate.update(state)
 562             for key, value in slotstate.items():
 563                 setattr(object, key, value)
 564
 565     def construct_python_object(self, suffix, node):
 566         # Format:
 567         #   !!python/object:module.name { ... state ... }
 568         instance = self.make_python_instance(suffix, node, newobj=True)
 569         yield instance
 570         deep = hasattr(instance, '__setstate__')
 571         state = self.construct_mapping(node, deep=deep)
 572         self.set_python_instance_state(instance, state)
 573
 574     def construct_python_object_apply(self, suffix, node, newobj=False):
 575         # Format:
 576         #   !!python/object/apply       # (or !!python/object/new)
 577         #   args: [ ... arguments ... ]
 578         #   kwds: { ... keywords ... }
 579         #   state: ... state ...
 580         #   listitems: [ ... listitems ... ]
 581         #   dictitems: { ... dictitems ... }
 582         # or short format:
 583         #   !!python/object/apply [ ... arguments ... ]
 584         # The difference between !!python/object/apply and !!python/object/new
 585         # is how an object is created, check make_python_instance for details.
 586         if isinstance(node, SequenceNode):
 587             args = self.construct_sequence(node, deep=True)
 588             kwds = {}
 589             state = {}
 590             listitems = []
 591             dictitems = {}
 592         else:
 593             value = self.construct_mapping(node, deep=True)
 594             args = value.get('args', [])
 595             kwds = value.get('kwds', {})
 596             state = value.get('state', {})
 597             listitems = value.get('listitems', [])
 598             dictitems = value.get('dictitems', {})
 599         instance = self.make_python_instance(suffix, node, args, kwds, newobj)
 600         if state:
 601             self.set_python_instance_state(instance, state)
 602         if listitems:
 603             instance.extend(listitems)
 604         if dictitems:
 605             for key in dictitems:
 606                 instance[key] = dictitems[key]
 607         return instance
 608
 609     def construct_python_object_new(self, suffix, node):
 610         return self.construct_python_object_apply(suffix, node, newobj=True)
 611
 612 Constructor.add_constructor(
 613     u'tag:yaml.org,2002:python/none',
 614     Constructor.construct_yaml_null)
 615
 616 Constructor.add_constructor(
 617     u'tag:yaml.org,2002:python/bool',
 618     Constructor.construct_yaml_bool)
 619
 620 Constructor.add_constructor(
 621     u'tag:yaml.org,2002:python/str',
 622     Constructor.construct_python_str)
 623
 624 Constructor.add_constructor(
 625     u'tag:yaml.org,2002:python/unicode',
 626     Constructor.construct_python_unicode)
 627
 628 Constructor.add_constructor(
 629     u'tag:yaml.org,2002:python/int',
 630     Constructor.construct_yaml_int)
 631
 632 Constructor.add_constructor(
 633     u'tag:yaml.org,2002:python/long',
 634     Constructor.construct_python_long)
 635
 636 Constructor.add_constructor(
 637     u'tag:yaml.org,2002:python/float',
 638     Constructor.construct_yaml_float)
 639
 640 Constructor.add_constructor(
 641     u'tag:yaml.org,2002:python/complex',
 642     Constructor.construct_python_complex)
 643
 644 Constructor.add_constructor(
 645     u'tag:yaml.org,2002:python/list',
 646     Constructor.construct_yaml_seq)
 647
 648 Constructor.add_constructor(
 649     u'tag:yaml.org,2002:python/tuple',
 650     Constructor.construct_python_tuple)
 651
 652 Constructor.add_constructor(
 653     u'tag:yaml.org,2002:python/dict',
 654     Constructor.construct_yaml_map)
 655
 656 Constructor.add_multi_constructor(
 657     u'tag:yaml.org,2002:python/name:',
 658     Constructor.construct_python_name)
 659
 660 Constructor.add_multi_constructor(
 661     u'tag:yaml.org,2002:python/module:',
 662     Constructor.construct_python_module)
 663
 664 Constructor.add_multi_constructor(
 665     u'tag:yaml.org,2002:python/object:',
 666     Constructor.construct_python_object)
 667
 668 Constructor.add_multi_constructor(
 669     u'tag:yaml.org,2002:python/object/apply:',
 670     Constructor.construct_python_object_apply)
 671
 672 Constructor.add_multi_constructor(
 673     u'tag:yaml.org,2002:python/object/new:',
 674     Constructor.construct_python_object_new)
 675