Display information about HModel objects (Ref issue: #22)

[NormannR]

Added methods str, repr and repr_html to the HModel class

[albop]

Thank you @NormannR . A quick question: line 119, the new version looks equivalent to the former one (d.get(k, v) is supposed to d[k] with default value v )
If it isn't that suggests a bug in the .get method. If I remember well, it is monkey patched by dolo, so that the structure returned by the yaml parsing behaves like a dict.

[NormannR]

It is not exactly equivalent, as d.get() returns a ScalarNode object in our case, and ScalarNode objects do not include any get method. We then return "Anonymous" if the attribute value does not exist within this ScalarNode object. If the ScalarNode object had a get() method, we could directly use the get(k,v) syntax as you suggest.

[albop]

Isn't model.data rather a MappingNode object? From https://github.com/EconForge/dolang.py/blob/9e9d0a47c2558656b8ae33af379d2b66965985c2/dolang/yaml_tools.py#L44, I see that it is augmented with a .get method, as soon as dolang is loaded.
It's not devoid of problem though:

• it does not have a default value
• you when the key is present it returns a scalarvalue object, which implies further manipulation. And might justify to keep the try/except
  So let's keep your version...

[albop]

Actually, would you mind reformatting your PR with black and commit the change ?

[NormannR]

Isn't model.data rather a MappingNode object? From https://github.com/EconForge/dolang.py/blob/9e9d0a47c2558656b8ae33af379d2b66965985c2/dolang/yaml_tools.py#L44, I see that it is augmented with a .get method, as soon as dolang is loaded. It's not devoid of problem though:

* it does not have a default value

* you when the key is present it returns a scalarvalue object, which implies further manipulation. And might justify to keep the try/except
  So let's keep your version...

Indeed, model.data is a MappingNode object and model.data.name is a ScalarNodeobject, but the latter does not have a get method from which one may get the value attribute that contains what we're looking for.

Actually, would you mind reformatting your PR with black and commit the change ?

Right away!