How to use construct method in autotest

Best Python code snippet using autotest_python

constructor.py

Source:constructor.py

1__all__ = ['BaseConstructor', 'SafeConstructor', 'Constructor',2    'ConstructorError']3from error import *4from nodes import *5import datetime6import binascii, re, sys, types7class ConstructorError(MarkedYAMLError):8    pass9class BaseConstructor(object):10    yaml_constructors = {}11    yaml_multi_constructors = {}12    def __init__(self):13        self.constructed_objects = {}14        self.recursive_objects = {}15        self.state_generators = []16        self.deep_construct = False17    def check_data(self):18        # If there are more documents available?19        return self.check_node()20    def get_data(self):21        # Construct and return the next document.22        if self.check_node():23            return self.construct_document(self.get_node())24    def get_single_data(self):25        # Ensure that the stream contains a single document and construct it.26        node = self.get_single_node()27        if node is not None:28            return self.construct_document(node)29        return None30    def construct_document(self, node):31        data = self.construct_object(node)32        while self.state_generators:33            state_generators = self.state_generators34            self.state_generators = []35            for generator in state_generators:36                for dummy in generator:37                    pass38        self.constructed_objects = {}39        self.recursive_objects = {}40        self.deep_construct = False41        return data42    def construct_object(self, node, deep=False):43        if node in self.constructed_objects:44            return self.constructed_objects[node]45        if deep:46            old_deep = self.deep_construct47            self.deep_construct = True48        if node in self.recursive_objects:49            raise ConstructorError(None, None,50                    "found unconstructable recursive node", node.start_mark)51        self.recursive_objects[node] = None52        constructor = None53        tag_suffix = None54        if node.tag in self.yaml_constructors:55            constructor = self.yaml_constructors[node.tag]56        else:57            for tag_prefix in self.yaml_multi_constructors:58                if node.tag.startswith(tag_prefix):59                    tag_suffix = node.tag[len(tag_prefix):]60                    constructor = self.yaml_multi_constructors[tag_prefix]61                    break62            else:63                if None in self.yaml_multi_constructors:64                    tag_suffix = node.tag65                    constructor = self.yaml_multi_constructors[None]66                elif None in self.yaml_constructors:67                    constructor = self.yaml_constructors[None]68                elif isinstance(node, ScalarNode):69                    constructor = self.__class__.construct_scalar70                elif isinstance(node, SequenceNode):71                    constructor = self.__class__.construct_sequence72                elif isinstance(node, MappingNode):73                    constructor = self.__class__.construct_mapping74        if tag_suffix is None:75            data = constructor(self, node)76        else:77            data = constructor(self, tag_suffix, node)78        if isinstance(data, types.GeneratorType):79            generator = data80            data = generator.next()81            if self.deep_construct:82                for dummy in generator:83                    pass84            else:85                self.state_generators.append(generator)86        self.constructed_objects[node] = data87        del self.recursive_objects[node]88        if deep:89            self.deep_construct = old_deep90        return data91    def construct_scalar(self, node):92        if not isinstance(node, ScalarNode):93            raise ConstructorError(None, None,94                    "expected a scalar node, but found %s" % node.id,95                    node.start_mark)96        return node.value97    def construct_sequence(self, node, deep=False):98        if not isinstance(node, SequenceNode):99            raise ConstructorError(None, None,100                    "expected a sequence node, but found %s" % node.id,101                    node.start_mark)102        return [self.construct_object(child, deep=deep)103                for child in node.value]104    def construct_mapping(self, node, deep=False):105        if not isinstance(node, MappingNode):106            raise ConstructorError(None, None,107                    "expected a mapping node, but found %s" % node.id,108                    node.start_mark)109        mapping = {}110        for key_node, value_node in node.value:111            key = self.construct_object(key_node, deep=deep)112            try:113                hash(key)114            except TypeError, exc:115                raise ConstructorError("while constructing a mapping", node.start_mark,116                        "found unacceptable key (%s)" % exc, key_node.start_mark)117            value = self.construct_object(value_node, deep=deep)118            mapping[key] = value119        return mapping120    def construct_pairs(self, node, deep=False):121        if not isinstance(node, MappingNode):122            raise ConstructorError(None, None,123                    "expected a mapping node, but found %s" % node.id,124                    node.start_mark)125        pairs = []126        for key_node, value_node in node.value:127            key = self.construct_object(key_node, deep=deep)128            value = self.construct_object(value_node, deep=deep)129            pairs.append((key, value))130        return pairs131    def add_constructor(cls, tag, constructor):132        if not 'yaml_constructors' in cls.__dict__:133            cls.yaml_constructors = cls.yaml_constructors.copy()134        cls.yaml_constructors[tag] = constructor135    add_constructor = classmethod(add_constructor)136    def add_multi_constructor(cls, tag_prefix, multi_constructor):137        if not 'yaml_multi_constructors' in cls.__dict__:138            cls.yaml_multi_constructors = cls.yaml_multi_constructors.copy()139        cls.yaml_multi_constructors[tag_prefix] = multi_constructor140    add_multi_constructor = classmethod(add_multi_constructor)141class SafeConstructor(BaseConstructor):142    def construct_scalar(self, node):143        if isinstance(node, MappingNode):144            for key_node, value_node in node.value:145                if key_node.tag == u'tag:yaml.org,2002:value':146                    return self.construct_scalar(value_node)147        return BaseConstructor.construct_scalar(self, node)148    def flatten_mapping(self, node):149        merge = []150        index = 0151        while index < len(node.value):152            key_node, value_node = node.value[index]153            if key_node.tag == u'tag:yaml.org,2002:merge':154                del node.value[index]155                if isinstance(value_node, MappingNode):156                    self.flatten_mapping(value_node)157                    merge.extend(value_node.value)158                elif isinstance(value_node, SequenceNode):159                    submerge = []160                    for subnode in value_node.value:161                        if not isinstance(subnode, MappingNode):162                            raise ConstructorError("while constructing a mapping",163                                    node.start_mark,164                                    "expected a mapping for merging, but found %s"165                                    % subnode.id, subnode.start_mark)166                        self.flatten_mapping(subnode)167                        submerge.append(subnode.value)168                    submerge.reverse()169                    for value in submerge:170                        merge.extend(value)171                else:172                    raise ConstructorError("while constructing a mapping", node.start_mark,173                            "expected a mapping or list of mappings for merging, but found %s"174                            % value_node.id, value_node.start_mark)175            elif key_node.tag == u'tag:yaml.org,2002:value':176                key_node.tag = u'tag:yaml.org,2002:str'177                index += 1178            else:179                index += 1180        if merge:181            node.value = merge + node.value182    def construct_mapping(self, node, deep=False):183        if isinstance(node, MappingNode):184            self.flatten_mapping(node)185        return BaseConstructor.construct_mapping(self, node, deep=deep)186    def construct_yaml_null(self, node):187        self.construct_scalar(node)188        return None189    bool_values = {190        u'yes':     True,191        u'no':      False,192        u'true':    True,193        u'false':   False,194        u'on':      True,195        u'off':     False,196    }197    def construct_yaml_bool(self, node):198        value = self.construct_scalar(node)199        return self.bool_values[value.lower()]200    def construct_yaml_int(self, node):201        value = str(self.construct_scalar(node))202        value = value.replace('_', '')203        sign = +1204        if value[0] == '-':205            sign = -1206        if value[0] in '+-':207            value = value[1:]208        if value == '0':209            return 0210        elif value.startswith('0b'):211            return sign*int(value[2:], 2)212        elif value.startswith('0x'):213            return sign*int(value[2:], 16)214        elif value[0] == '0':215            return sign*int(value, 8)216        elif ':' in value:217            digits = [int(part) for part in value.split(':')]218            digits.reverse()219            base = 1220            value = 0221            for digit in digits:222                value += digit*base223                base *= 60224            return sign*value225        else:226            return sign*int(value)227    inf_value = 1e300228    while inf_value != inf_value*inf_value:229        inf_value *= inf_value230    nan_value = -inf_value/inf_value   # Trying to make a quiet NaN (like C99).231    def construct_yaml_float(self, node):232        value = str(self.construct_scalar(node))233        value = value.replace('_', '').lower()234        sign = +1235        if value[0] == '-':236            sign = -1237        if value[0] in '+-':238            value = value[1:]239        if value == '.inf':240            return sign*self.inf_value241        elif value == '.nan':242            return self.nan_value243        elif ':' in value:244            digits = [float(part) for part in value.split(':')]245            digits.reverse()246            base = 1247            value = 0.0248            for digit in digits:249                value += digit*base250                base *= 60251            return sign*value252        else:253            return sign*float(value)254    def construct_yaml_binary(self, node):255        value = self.construct_scalar(node)256        try:257            return str(value).decode('base64')258        except (binascii.Error, UnicodeEncodeError), exc:259            raise ConstructorError(None, None,260                    "failed to decode base64 data: %s" % exc, node.start_mark) 261    timestamp_regexp = re.compile(262            ur'''^(?P<year>[0-9][0-9][0-9][0-9])263                -(?P<month>[0-9][0-9]?)264                -(?P<day>[0-9][0-9]?)265                (?:(?:[Tt]|[ \t]+)266                (?P<hour>[0-9][0-9]?)267                :(?P<minute>[0-9][0-9])268                :(?P<second>[0-9][0-9])269                (?:\.(?P<fraction>[0-9]*))?270                (?:[ \t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?)271                (?::(?P<tz_minute>[0-9][0-9]))?))?)?$''', re.X)272    def construct_yaml_timestamp(self, node):273        value = self.construct_scalar(node)274        match = self.timestamp_regexp.match(node.value)275        values = match.groupdict()276        year = int(values['year'])277        month = int(values['month'])278        day = int(values['day'])279        if not values['hour']:280            return datetime.date(year, month, day)281        hour = int(values['hour'])282        minute = int(values['minute'])283        second = int(values['second'])284        fraction = 0285        if values['fraction']:286            fraction = values['fraction'][:6]287            while len(fraction) < 6:288                fraction += '0'289            fraction = int(fraction)290        delta = None291        if values['tz_sign']:292            tz_hour = int(values['tz_hour'])293            tz_minute = int(values['tz_minute'] or 0)294            delta = datetime.timedelta(hours=tz_hour, minutes=tz_minute)295            if values['tz_sign'] == '-':296                delta = -delta297        data = datetime.datetime(year, month, day, hour, minute, second, fraction)298        if delta:299            data -= delta300        return data301    def construct_yaml_omap(self, node):302        # Note: we do not check for duplicate keys, because it's too303        # CPU-expensive.304        omap = []305        yield omap306        if not isinstance(node, SequenceNode):307            raise ConstructorError("while constructing an ordered map", node.start_mark,308                    "expected a sequence, but found %s" % node.id, node.start_mark)309        for subnode in node.value:310            if not isinstance(subnode, MappingNode):311                raise ConstructorError("while constructing an ordered map", node.start_mark,312                        "expected a mapping of length 1, but found %s" % subnode.id,313                        subnode.start_mark)314            if len(subnode.value) != 1:315                raise ConstructorError("while constructing an ordered map", node.start_mark,316                        "expected a single mapping item, but found %d items" % len(subnode.value),317                        subnode.start_mark)318            key_node, value_node = subnode.value[0]319            key = self.construct_object(key_node)320            value = self.construct_object(value_node)321            omap.append((key, value))322    def construct_yaml_pairs(self, node):323        # Note: the same code as `construct_yaml_omap`.324        pairs = []325        yield pairs326        if not isinstance(node, SequenceNode):327            raise ConstructorError("while constructing pairs", node.start_mark,328                    "expected a sequence, but found %s" % node.id, node.start_mark)329        for subnode in node.value:330            if not isinstance(subnode, MappingNode):331                raise ConstructorError("while constructing pairs", node.start_mark,332                        "expected a mapping of length 1, but found %s" % subnode.id,333                        subnode.start_mark)334            if len(subnode.value) != 1:335                raise ConstructorError("while constructing pairs", node.start_mark,336                        "expected a single mapping item, but found %d items" % len(subnode.value),337                        subnode.start_mark)338            key_node, value_node = subnode.value[0]339            key = self.construct_object(key_node)340            value = self.construct_object(value_node)341            pairs.append((key, value))342    def construct_yaml_set(self, node):343        data = set()344        yield data345        value = self.construct_mapping(node)346        data.update(value)347    def construct_yaml_str(self, node):348        value = self.construct_scalar(node)349        try:350            return value.encode('ascii')351        except UnicodeEncodeError:352            return value353    def construct_yaml_seq(self, node):354        data = []355        yield data356        data.extend(self.construct_sequence(node))357    def construct_yaml_map(self, node):358        data = {}359        yield data360        value = self.construct_mapping(node)361        data.update(value)362    def construct_yaml_object(self, node, cls):363        data = cls.__new__(cls)364        yield data365        if hasattr(data, '__setstate__'):366            state = self.construct_mapping(node, deep=True)367            data.__setstate__(state)368        else:369            state = self.construct_mapping(node)370            data.__dict__.update(state)371    def construct_undefined(self, node):372        raise ConstructorError(None, None,373                "could not determine a constructor for the tag %r" % node.tag.encode('utf-8'),374                node.start_mark)375SafeConstructor.add_constructor(376        u'tag:yaml.org,2002:null',377        SafeConstructor.construct_yaml_null)378SafeConstructor.add_constructor(379        u'tag:yaml.org,2002:bool',380        SafeConstructor.construct_yaml_bool)381SafeConstructor.add_constructor(382        u'tag:yaml.org,2002:int',383        SafeConstructor.construct_yaml_int)384SafeConstructor.add_constructor(385        u'tag:yaml.org,2002:float',386        SafeConstructor.construct_yaml_float)387SafeConstructor.add_constructor(388        u'tag:yaml.org,2002:binary',389        SafeConstructor.construct_yaml_binary)390SafeConstructor.add_constructor(391        u'tag:yaml.org,2002:timestamp',392        SafeConstructor.construct_yaml_timestamp)393SafeConstructor.add_constructor(394        u'tag:yaml.org,2002:omap',395        SafeConstructor.construct_yaml_omap)396SafeConstructor.add_constructor(397        u'tag:yaml.org,2002:pairs',398        SafeConstructor.construct_yaml_pairs)399SafeConstructor.add_constructor(400        u'tag:yaml.org,2002:set',401        SafeConstructor.construct_yaml_set)402SafeConstructor.add_constructor(403        u'tag:yaml.org,2002:str',404        SafeConstructor.construct_yaml_str)405SafeConstructor.add_constructor(406        u'tag:yaml.org,2002:seq',407        SafeConstructor.construct_yaml_seq)408SafeConstructor.add_constructor(409        u'tag:yaml.org,2002:map',410        SafeConstructor.construct_yaml_map)411SafeConstructor.add_constructor(None,412        SafeConstructor.construct_undefined)413class Constructor(SafeConstructor):414    def construct_python_str(self, node):415        return self.construct_scalar(node).encode('utf-8')416    def construct_python_unicode(self, node):417        return self.construct_scalar(node)418    def construct_python_long(self, node):419        return long(self.construct_yaml_int(node))420    def construct_python_complex(self, node):421       return complex(self.construct_scalar(node))422    def construct_python_tuple(self, node):423        return tuple(self.construct_sequence(node))424    def find_python_module(self, name, mark):425        if not name:426            raise ConstructorError("while constructing a Python module", mark,427                    "expected non-empty name appended to the tag", mark)428        try:429            __import__(name)430        except ImportError, exc:431            raise ConstructorError("while constructing a Python module", mark,432                    "cannot find module %r (%s)" % (name.encode('utf-8'), exc), mark)433        return sys.modules[name]434    def find_python_name(self, name, mark):435        if not name:436            raise ConstructorError("while constructing a Python object", mark,437                    "expected non-empty name appended to the tag", mark)438        if u'.' in name:439            module_name, object_name = name.rsplit('.', 1)440        else:441            module_name = '__builtin__'442            object_name = name443        try:444            __import__(module_name)445        except ImportError, exc:446            raise ConstructorError("while constructing a Python object", mark,447                    "cannot find module %r (%s)" % (module_name.encode('utf-8'), exc), mark)448        module = sys.modules[module_name]449        if not hasattr(module, object_name):450            raise ConstructorError("while constructing a Python object", mark,451                    "cannot find %r in the module %r" % (object_name.encode('utf-8'),452                        module.__name__), mark)453        return getattr(module, object_name)454    def construct_python_name(self, suffix, node):455        value = self.construct_scalar(node)456        if value:457            raise ConstructorError("while constructing a Python name", node.start_mark,458                    "expected the empty value, but found %r" % value.encode('utf-8'),459                    node.start_mark)460        return self.find_python_name(suffix, node.start_mark)461    def construct_python_module(self, suffix, node):462        value = self.construct_scalar(node)463        if value:464            raise ConstructorError("while constructing a Python module", node.start_mark,465                    "expected the empty value, but found %r" % value.encode('utf-8'),466                    node.start_mark)467        return self.find_python_module(suffix, node.start_mark)468    class classobj: pass469    def make_python_instance(self, suffix, node,470            args=None, kwds=None, newobj=False):471        if not args:472            args = []473        if not kwds:474            kwds = {}475        cls = self.find_python_name(suffix, node.start_mark)476        if newobj and isinstance(cls, type(self.classobj))  \477                and not args and not kwds:478            instance = self.classobj()479            instance.__class__ = cls480            return instance481        elif newobj and isinstance(cls, type):482            return cls.__new__(cls, *args, **kwds)483        else:484            return cls(*args, **kwds)485    def set_python_instance_state(self, instance, state):486        if hasattr(instance, '__setstate__'):487            instance.__setstate__(state)488        else:489            slotstate = {}490            if isinstance(state, tuple) and len(state) == 2:491                state, slotstate = state492            if hasattr(instance, '__dict__'):493                instance.__dict__.update(state)494            elif state:495                slotstate.update(state)496            for key, value in slotstate.items():497                setattr(object, key, value)498    def construct_python_object(self, suffix, node):499        # Format:500        #   !!python/object:module.name { ... state ... }501        instance = self.make_python_instance(suffix, node, newobj=True)502        yield instance503        deep = hasattr(instance, '__setstate__')504        state = self.construct_mapping(node, deep=deep)505        self.set_python_instance_state(instance, state)506    def construct_python_object_apply(self, suffix, node, newobj=False):507        # Format:508        #   !!python/object/apply       # (or !!python/object/new)509        #   args: [ ... arguments ... ]510        #   kwds: { ... keywords ... }511        #   state: ... state ...512        #   listitems: [ ... listitems ... ]513        #   dictitems: { ... dictitems ... }514        # or short format:515        #   !!python/object/apply [ ... arguments ... ]516        # The difference between !!python/object/apply and !!python/object/new517        # is how an object is created, check make_python_instance for details.518        if isinstance(node, SequenceNode):519            args = self.construct_sequence(node, deep=True)520            kwds = {}521            state = {}522            listitems = []523            dictitems = {}524        else:525            value = self.construct_mapping(node, deep=True)526            args = value.get('args', [])527            kwds = value.get('kwds', {})528            state = value.get('state', {})529            listitems = value.get('listitems', [])530            dictitems = value.get('dictitems', {})531        instance = self.make_python_instance(suffix, node, args, kwds, newobj)532        if state:533            self.set_python_instance_state(instance, state)534        if listitems:535            instance.extend(listitems)536        if dictitems:537            for key in dictitems:538                instance[key] = dictitems[key]539        return instance540    def construct_python_object_new(self, suffix, node):541        return self.construct_python_object_apply(suffix, node, newobj=True)542Constructor.add_constructor(543    u'tag:yaml.org,2002:python/none',544    Constructor.construct_yaml_null)545Constructor.add_constructor(546    u'tag:yaml.org,2002:python/bool',547    Constructor.construct_yaml_bool)548Constructor.add_constructor(549    u'tag:yaml.org,2002:python/str',550    Constructor.construct_python_str)551Constructor.add_constructor(552    u'tag:yaml.org,2002:python/unicode',553    Constructor.construct_python_unicode)554Constructor.add_constructor(555    u'tag:yaml.org,2002:python/int',556    Constructor.construct_yaml_int)557Constructor.add_constructor(558    u'tag:yaml.org,2002:python/long',559    Constructor.construct_python_long)560Constructor.add_constructor(561    u'tag:yaml.org,2002:python/float',562    Constructor.construct_yaml_float)563Constructor.add_constructor(564    u'tag:yaml.org,2002:python/complex',565    Constructor.construct_python_complex)566Constructor.add_constructor(567    u'tag:yaml.org,2002:python/list',568    Constructor.construct_yaml_seq)569Constructor.add_constructor(570    u'tag:yaml.org,2002:python/tuple',571    Constructor.construct_python_tuple)572Constructor.add_constructor(573    u'tag:yaml.org,2002:python/dict',574    Constructor.construct_yaml_map)575Constructor.add_multi_constructor(576    u'tag:yaml.org,2002:python/name:',577    Constructor.construct_python_name)578Constructor.add_multi_constructor(579    u'tag:yaml.org,2002:python/module:',580    Constructor.construct_python_module)581Constructor.add_multi_constructor(582    u'tag:yaml.org,2002:python/object:',583    Constructor.construct_python_object)584Constructor.add_multi_constructor(585    u'tag:yaml.org,2002:python/object/apply:',586    Constructor.construct_python_object_apply)587Constructor.add_multi_constructor(588    u'tag:yaml.org,2002:python/object/new:',...

constructor.pyi

Source:constructor.pyi

1from yaml.error import Mark, YAMLError, MarkedYAMLError2from yaml.nodes import Node, ScalarNode, CollectionNode, SequenceNode, MappingNode3from typing import Any4class ConstructorError(MarkedYAMLError): ...5class BaseConstructor:6    yaml_constructors: Any7    yaml_multi_constructors: Any8    constructed_objects: Any9    recursive_objects: Any10    state_generators: Any11    deep_construct: Any12    def __init__(self) -> None: ...13    def check_data(self): ...14    def get_data(self): ...15    def get_single_data(self): ...16    def construct_document(self, node): ...17    def construct_object(self, node, deep=...): ...18    def construct_scalar(self, node): ...19    def construct_sequence(self, node, deep=...): ...20    def construct_mapping(self, node, deep=...): ...21    def construct_pairs(self, node, deep=...): ...22    @classmethod23    def add_constructor(cls, tag, constructor): ...24    @classmethod25    def add_multi_constructor(cls, tag_prefix, multi_constructor): ...26class SafeConstructor(BaseConstructor):27    def construct_scalar(self, node): ...28    def flatten_mapping(self, node): ...29    def construct_mapping(self, node, deep=...): ...30    def construct_yaml_null(self, node): ...31    bool_values: Any32    def construct_yaml_bool(self, node): ...33    def construct_yaml_int(self, node): ...34    inf_value: Any35    nan_value: Any36    def construct_yaml_float(self, node): ...37    def construct_yaml_binary(self, node): ...38    timestamp_regexp: Any39    def construct_yaml_timestamp(self, node): ...40    def construct_yaml_omap(self, node): ...41    def construct_yaml_pairs(self, node): ...42    def construct_yaml_set(self, node): ...43    def construct_yaml_str(self, node): ...44    def construct_yaml_seq(self, node): ...45    def construct_yaml_map(self, node): ...46    def construct_yaml_object(self, node, cls): ...47    def construct_undefined(self, node): ...48class FullConstructor(SafeConstructor):49    def construct_python_str(self, node): ...50    def construct_python_unicode(self, node): ...51    def construct_python_bytes(self, node): ...52    def construct_python_long(self, node): ...53    def construct_python_complex(self, node): ...54    def construct_python_tuple(self, node): ...55    def find_python_module(self, name, mark, unsafe=...): ...56    def find_python_name(self, name, mark, unsafe=...): ...57    def construct_python_name(self, suffix, node): ...58    def construct_python_module(self, suffix, node): ...59    def make_python_instance(self, suffix, node, args=..., kwds=..., newobj=..., unsafe=...): ...60    def set_python_instance_state(self, instance, state): ...61    def construct_python_object(self, suffix, node): ...62    def construct_python_object_apply(self, suffix, node, newobj=...): ...63    def construct_python_object_new(self, suffix, node): ...64class Constructor(SafeConstructor):65    def construct_python_str(self, node): ...66    def construct_python_unicode(self, node): ...67    def construct_python_long(self, node): ...68    def construct_python_complex(self, node): ...69    def construct_python_tuple(self, node): ...70    def find_python_module(self, name, mark): ...71    def find_python_name(self, name, mark): ...72    def construct_python_name(self, suffix, node): ...73    def construct_python_module(self, suffix, node): ...74    class classobj: ...75    def make_python_instance(self, suffix, node, args=..., kwds=..., newobj=...): ...76    def set_python_instance_state(self, instance, state): ...77    def construct_python_object(self, suffix, node): ...78    def construct_python_object_apply(self, suffix, node, newobj=...): ......

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