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Trying to serialize and then deserialize a nested class like
import yaml
class A:
class B:
def __init__(self, i):
self.i = i
def __init__(self, i):
self.b = A.B(i)
yaml.load(yaml.dump(A(0)))with pyyaml 3.12 (python 3.6) yields an exception:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/__init__.py", line 72, in load
return loader.get_single_data()
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 37, in get_single_data
return self.construct_document(node)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 46, in construct_document
for dummy in generator:
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 578, in construct_python_object
state = self.construct_mapping(node, deep=deep)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 204, in construct_mapping
return super().construct_mapping(node, deep=deep)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 129, in construct_mapping
value = self.construct_object(value_node, deep=deep)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 91, in construct_object
data = next(generator)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 575, in construct_python_object
instance = self.make_python_instance(suffix, node, newobj=True)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 552, in make_python_instance
cls = self.find_python_name(suffix, node.start_mark)
File "/home/calrama/.local/lib64/python3.6/site-packages/yaml/constructor.py", line 529, in find_python_name
% (object_name, module.__name__), mark)
yaml.constructor.ConstructorError: while constructing a Python object
cannot find 'B' in the module '__main__'
in "<unicode string>", line 2, column 4:
b: !!python/object:__main__.B {i: 0}
^
Without nesting B in A it works as expected:
import yaml
class B:
def __init__(self, i):
self.i = i
class A:
def __init__(self, i):
self.b = B(i)
yaml.load(yaml.dump(A(0)))The obvious workaround of just not using nesting is not always easily applicable when e.g. working with classes exposed from C/C++ (especially with C/C++ enumerations exposed as nested classes).
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