Update Python documentation (and error handling)

The documentation at https://epdx.kongsgaard.eu/usage/usage/ is out of date. When running the sample code with epdx version 1.1.5, error arises:

from pathlib import Path
import json
import epdx.pydantic

ilcd_file = Path(__file__).parent.parent / "data" / "ilcd.json"

print("EPD as dict")
epd_dict = epdx.convert_ilcd(ilcd_file.read_text())
print(json.dumps(epd_dict, indent=2))

print("\nEPD as Pydantic model")
epd_pydantic = epdx.convert_ilcd(ilcd_file.read_text(), as_type="pydantic")
print(epd_pydantic)

print("\nEPD as string")
epd_str = epdx.convert_ilcd(ilcd_file.read_text(), as_type="str")
print(epd_str)

TypeError                                 Traceback (most recent call last)
Cell In[4], line 12
      9 print(json.dumps(epd_dict, indent=2))
     11 print("\nEPD as Pydantic model")
---> 12 epd_pydantic = epdx.convert_ilcd(ilcd_file.read_text(), as_type="pydantic")
     13 print(epd_pydantic)
     15 print("\nEPD as string")

File ~/.cache/pypoetry/virtualenvs/epdx-test-qq20DbS5-py3.11/lib/python3.11/site-packages/epdx/__init__.py:36, in convert_ilcd(data, as_type)
     34     return EPD(**json.loads(_epd))
     35 else:
---> 36     raise NotImplemented("Currently only 'dict', 'str' and 'pydantic' is implemented as_type.")

TypeError: 'NotImplementedType' object is not callable

Firstly, line 36 should raise NotImplementedError(...), as now the raising raises TypeError.

Secondly, allowed values for convert_ilcd are to be str, dict and epdx.pydantic.EPD (type, type and class), not 'str', 'dict' and 'pydantic' as indicated by the documentation. You might want to update documentation to reflect the API.

ocni-dtu / epdx

Update Python documentation (and error handling) #29