error in representer.py

[gpipelee]

Hi,

I'm using pyyaml 5.4.1, installed from pypi, and came across the error below. Could you perhaps help me understand what goes wrong?

Many thanks in advance.

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml_init_.py in dump(data, stream, Dumper, **kwds)
288 If stream is None, return the produced string instead.
289 """
--> 290 return dump_all([data], stream, Dumper=Dumper, **kwds)
291
292 def safe_dump_all(documents, stream=None, **kwds):

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml_init_.py in dump_all(documents, stream, Dumper, default_style, default_flow_style, canonical, indent, width, allow_unicode, line_break, encoding, explicit_start, explicit_end, version, tags, sort_keys)
276 dumper.open()
277 for data in documents:
--> 278 dumper.represent(data)
279 dumper.close()
280 finally:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent(self, data)
25
26 def represent(self, data):
---> 27 node = self.represent_data(data)
28 self.serialize(node)
29 self.represented_objects = {}

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
46 data_types = type(data).mro
47 if data_types[0] in self.yaml_representers:
---> 48 node = self.yaml_representers[data_types[0]](self, data)
49 else:
50 for data_type in data_types:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml_init_.py in to_yaml(cls, dumper, data)
424 """
425 return dumper.represent_yaml_object(cls.yaml_tag, data, cls,
--> 426 flow_style=cls.yaml_flow_style)
427

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_yaml_object(self, tag, data, cls, flow_style)
226 else:
227 state = data.dict.copy()
--> 228 return self.represent_mapping(tag, state, flow_style=flow_style)
229
230 def represent_undefined(self, data):

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_mapping(self, tag, mapping, flow_style)
116 for item_key, item_value in mapping:
117 node_key = self.represent_data(item_key)
--> 118 node_value = self.represent_data(item_value)
119 if not (isinstance(node_key, ScalarNode) and not node_key.style):
120 best_style = False

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
46 data_types = type(data).mro
47 if data_types[0] in self.yaml_representers:
---> 48 node = self.yaml_representers[data_types[0]](self, data)
49 else:
50 for data_type in data_types:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_list(self, data)
197 # break
198 #if not pairs:
--> 199 return self.represent_sequence('tag:yaml.org,2002:seq', data)
200 #value = []
201 #for item_key, item_value in data:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_sequence(self, tag, sequence, flow_style)
90 best_style = True
91 for item in sequence:
---> 92 node_item = self.represent_data(item)
93 if not (isinstance(node_item, ScalarNode) and not node_item.style):
94 best_style = False

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
46 data_types = type(data).mro
47 if data_types[0] in self.yaml_representers:
---> 48 node = self.yaml_representers[data_types[0]](self, data)
49 else:
50 for data_type in data_types:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_dict(self, data)
205
206 def represent_dict(self, data):
--> 207 return self.represent_mapping('tag:yaml.org,2002:map', data)
208
209 def represent_set(self, data):

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_mapping(self, tag, mapping, flow_style)
116 for item_key, item_value in mapping:
117 node_key = self.represent_data(item_key)
--> 118 node_value = self.represent_data(item_value)
119 if not (isinstance(node_key, ScalarNode) and not node_key.style):
120 best_style = False

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
46 data_types = type(data).mro
47 if data_types[0] in self.yaml_representers:
---> 48 node = self.yaml_representers[data_types[0]](self, data)
49 else:
50 for data_type in data_types:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_list(self, data)
197 # break
198 #if not pairs:
--> 199 return self.represent_sequence('tag:yaml.org,2002:seq', data)
200 #value = []
201 #for item_key, item_value in data:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_sequence(self, tag, sequence, flow_style)
90 best_style = True
91 for item in sequence:
---> 92 node_item = self.represent_data(item)
93 if not (isinstance(node_item, ScalarNode) and not node_item.style):
94 best_style = False

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
46 data_types = type(data).mro
47 if data_types[0] in self.yaml_representers:
---> 48 node = self.yaml_representers[data_types[0]](self, data)
49 else:
50 for data_type in data_types:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml_init_.py in to_yaml(cls, dumper, data)
424 """
425 return dumper.represent_yaml_object(cls.yaml_tag, data, cls,
--> 426 flow_style=cls.yaml_flow_style)
427

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_yaml_object(self, tag, data, cls, flow_style)
226 else:
227 state = data.dict.copy()
--> 228 return self.represent_mapping(tag, state, flow_style=flow_style)
229
230 def represent_undefined(self, data):

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_mapping(self, tag, mapping, flow_style)
116 for item_key, item_value in mapping:
117 node_key = self.represent_data(item_key)
--> 118 node_value = self.represent_data(item_value)
119 if not (isinstance(node_key, ScalarNode) and not node_key.style):
120 best_style = False

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
46 data_types = type(data).mro
47 if data_types[0] in self.yaml_representers:
---> 48 node = self.yaml_representers[data_types[0]](self, data)
49 else:
50 for data_type in data_types:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_list(self, data)
197 # break
198 #if not pairs:
--> 199 return self.represent_sequence('tag:yaml.org,2002:seq', data)
200 #value = []
201 #for item_key, item_value in data:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_sequence(self, tag, sequence, flow_style)
90 best_style = True
91 for item in sequence:
---> 92 node_item = self.represent_data(item)
93 if not (isinstance(node_item, ScalarNode) and not node_item.style):
94 best_style = False

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_data(self, data)
50 for data_type in data_types:
51 if data_type in self.yaml_multi_representers:
---> 52 node = self.yaml_multi_representers[data_type](self, data)
53 break
54 else:

c:\users\gpipeleers.conda\envs\bp\lib\site-packages\yaml\representer.py in represent_object(self, data)
315 reduce = copyreg.dispatch_tablecls
316 elif hasattr(data, 'reduce_ex'):
--> 317 reduce = data.reduce_ex(2)
318 elif hasattr(data, 'reduce'):
319 reduce = data.reduce()

TypeError: reduce_ex() takes exactly one argument (0 given)