Instant of custom python class as value

[adosar]

Hello,

I want to get a dictionary of the form {key: instance_of_a_class}.

I have the following .py file as an example:

import yaml

class Bar:
    def __init__(self):
        x = 3213


out = ''' 
key: !!python/object:__main__.Bar
'''

print(yaml.unsafe_load(out))

I get the following error:

Traceback (most recent call last):
  File "/home/ansar/trial/foo.py", line 12, in <module>
    print(yaml.unsafe_load(out))
          ^^^^^^^^^^^^^^^^^^^^^
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/__init__.py", line 145, in unsafe_load
    return load(stream, UnsafeLoader)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/__init__.py", line 81, in load
    return loader.get_single_data()
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/constructor.py", line 51, in get_single_data
    return self.construct_document(node)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/constructor.py", line 60, in construct_document
    for dummy in generator:
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/constructor.py", line 620, in construct_python_object
    state = self.construct_mapping(node, deep=deep)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/constructor.py", line 218, in construct_mapping
    return super().construct_mapping(node, deep=deep)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ansar/venvir/ml/lib64/python3.11/site-packages/yaml/constructor.py", line 134, in construct_mapping
    raise ConstructorError(None, None,
yaml.constructor.ConstructorError: expected a mapping node, but found scalar
  in "<unicode string>", line 2, column 11:
    instance: !!python/object:__main__.Bar
              ^