`bw2parameters` > `pint` Import Error

[michaelweinold]

Trying to import bw2io, bw2data or bw2calc using the xeus-python-kernel-based JupyterLite version with these packages, I get the error:

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
Cell In[6], line 1
----> 1 import bw2data as bd

File /lib/python3.10/site-packages/bw2data/__init__.py:81
     78 mapping = Mapping()
     80 from .updates import Updates
---> 81 from .parameters import parameters
     83 Updates.check_status()

File /lib/python3.10/site-packages/bw2data/parameters.py:8
      6 import asteval
      7 from asteval import Interpreter
----> 8 from bw2parameters import ParameterSet
      9 from bw2parameters.errors import MissingName
     10 from peewee import (
     11     BooleanField,
     12     Check,
   (...)
     17     TextField,
     18 )

File /lib/python3.10/site-packages/bw2parameters/__init__.py:17
      1 __all__ = (
      2     "__version__",
      3     "FormulaSubstitutor",
   (...)
     12     "substitute_in_formulas",
     13 )
     16 from .errors import MissingName
---> 17 from .interpreter import Interpreter, PintInterpreter
     18 from .mangling import (
     19     FormulaSubstitutor,
     20     mangle_formula,
     21     prefix_parameter_dict,
     22     substitute_in_formulas,
     23 )
     24 from .parameter_set import ParameterSet, PintParameterSet

File /lib/python3.10/site-packages/bw2parameters/interpreter.py:9
      6 from asteval import NameFinder
      8 from .errors import MissingName
----> 9 from .pint import PintWrapper
     12 class Interpreter(ASTInterpreter):
     13     def __init__(self, *args, **kwargs):

File /lib/python3.10/site-packages/bw2parameters/pint.py:80
     76         else:
     77             return self.Quantity(value=amount, units=unit)
---> 80 PintWrapper = PintWrapperSingleton()

File /lib/python3.10/site-packages/bw2parameters/pint.py:17, in PintWrapperSingleton.__init__(self)
     15 if not hasattr(self, "string_preprocessor"):
     16     self.string_preprocessor = string_preprocessor
---> 17     self.ureg = UnitRegistry()
     18     self.Quantity = self.ureg.Quantity
     19     self.Unit = self.ureg.Unit

File /lib/python3.10/site-packages/pint/facets/plain/registry.py:138, in RegistryMeta.__call__(self, *args, **kwargs)
    136 def __call__(self, *args, **kwargs):
    137     obj = super().__call__(*args, **kwargs)
--> 138     obj._after_init()
    139     return obj

File /lib/python3.10/site-packages/pint/facets/system/registry.py:78, in GenericSystemRegistry._after_init(self)
     72 def _after_init(self) -> None:
     73     """Invoked at the end of ``__init__``.
     74 
     75     - Create default group and add all orphan units to it
     76     - Set default system
     77     """
---> 78     super()._after_init()
     80     #: System name to be used by default.
     81     self._default_system_name = self._default_system_name or self._defaults.get(
     82         "system", None
     83     )

File /lib/python3.10/site-packages/pint/facets/group/registry.py:64, in GenericGroupRegistry._after_init(self)
     58 def _after_init(self) -> None:
     59     """Invoked at the end of ``__init__``.
     60 
     61     - Create default group and add all orphan units to it
     62     - Set default system
     63     """
---> 64     super()._after_init()
     66     #: Copy units not defined in any group to the default group
     67     if "group" in self._defaults:

File /lib/python3.10/site-packages/pint/facets/plain/registry.py:307, in GenericPlainRegistry._after_init(self)
    305 if self._filename == "":
    306     path = pathlib.Path(__file__).parent.parent.parent / "default_en.txt"
--> 307     loaded_files = self.load_definitions(path, True)
    308 elif self._filename is not None:
    309     loaded_files = self.load_definitions(self._filename)

File /lib/python3.10/site-packages/pint/facets/plain/registry.py:550, in GenericPlainRegistry.load_definitions(self, file, is_resource)
    548     parsed_project = self._def_parser.parse_string("\n".join(file))
    549 else:
--> 550     parsed_project = self._def_parser.parse_file(file)
    552 for definition in self._def_parser.iter_parsed_project(parsed_project):
    553     self._helper_dispatch_adder(definition)

File /lib/python3.10/site-packages/pint/delegates/txt_defparser/defparser.py:137, in DefParser.parse_file(self, filename, cfg)
    134 def parse_file(
    135     self, filename: Union[pathlib.Path, str], cfg: Optional[ParserConfig] = None
    136 ):
--> 137     return fp.parse(
    138         filename,
    139         _PintParser,
    140         cfg or self._default_config,
    141         diskcache=self._diskcache,
    142     )

File /lib/python3.10/site-packages/pint/_vendor/flexparser.py:1393, in parse(entry_point, spec, config, strip_spaces, delimiters, locator, prefer_resource_as_file, **extra_parser_kwargs)
   1385 elif not (isinstance(entry_point, tuple) and len(entry_point) == 2):
   1386     raise TypeError(
   1387         f"Cannot handle type {type(entry_point)}, "
   1388         "use str or pathlib.Path for files or "
   1389         "(package: str, resource_name: str) tuple "
   1390         "for a resource."
   1391     )
-> 1393 pp[None] = parsed = parser.parse(entry_point)
   1394 pending.extend(
   1395     (parsed.location, el.target)
   1396     for el in parsed.parsed_source.filter_by(IncludeStatement)
   1397 )
   1399 while pending:

File /lib/python3.10/site-packages/pint/_vendor/flexparser.py:1010, in Parser.parse(self, source_location)
   1007     return self.parse_file(pathlib.Path(source_location))
   1009 if isinstance(source_location, pathlib.Path):
-> 1010     return self.parse_file(source_location)
   1012 raise TypeError(
   1013     f"Unknown type {type(source_location)}, "
   1014     "use str or pathlib.Path for files or "
   1015     "(package: str, resource_name: str) tuple "
   1016     "for a resource."
   1017 )

File /lib/python3.10/site-packages/pint/delegates/txt_defparser/defparser.py:77, in _PintParser.parse_file(self, path)
     75 def parse_file(self, path: pathlib.Path) -> PintSource:
     76     if self._diskcache is None:
---> 77         return super().parse_file(path)
     78     content, basename = self._diskcache.load(path, super().parse_file)
     79     return content

File /lib/python3.10/site-packages/pint/_vendor/flexparser.py:1042, in Parser.parse_file(self, path)
   1034 def parse_file(self, path: pathlib.Path) -> ParsedSource[RBT, CT]:
   1035     """Parse a file into a ParsedSourceFile.
   1036 
   1037     Parameters
   (...)
   1040         path of the file.
   1041     """
-> 1042     with path.open(mode="rb") as fi:
   1043         content = fi.read()
   1045     bos = BOF(
   1046         Hash.from_bytes(self._hasher, content), path, path.stat().st_mtime
   1047     ).set_simple_position(0, 0, 0)

File /lib/python3.10/pathlib.py:1117, in Path.open(self, mode, buffering, encoding, errors, newline)
   1115 if "b" not in mode:
   1116     encoding = io.text_encoding(encoding)
-> 1117 return self._accessor.open(self, mode, buffering, encoding, errors,
   1118                            newline)

FileNotFoundError: [Errno 44] No such file or directory: '/lib/python3.10/site-packages/pint/default_en.txt'

[michaelweinold]

This is an issue with pint:

from pint import DimensionalityError, Quantity, UndefinedUnitError, UnitRegistry
UnitRegistry()

will return the same error.

[michaelweinold]

It seems that I mentioned here: https://github.com/jupyter-xeus/xeus-python/issues/603#issuecomment-1814738569

In the meantime, we've made pint optional in our dependency list.

Did we?

[cmutel]

No, it is now a requirement of bw2parameters. But we can pin to an earlier version of that library, the addition of pint was the only change.