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Description:

ontopint 0.1.1

ontopint
A python package for reading & writing units from a JSON-LD files and generating pint quantities.
How it works
import ontopint

# jsonld input with 'value' and 'unit' mapped to qudt terms
data = {
"@context": {
"qudt": "http://qudt.org/schema/qudt/",
"qunit": "http://qudt.org/vocab/unit/",
"qkind": "http://qudt.org/vocab/quantkind/",
"unit": {
"@id": "qudt:hasUnit",
"@type": "@id"
},
"quantity": {
"@id": "qudt:hasQuantityKind",
"@type": "@id"
},
"value": "qudt:value"
},
"value": 4.0,
"unit": "qunit:CentiM"
}

# convert the value + unit pairs to pint.Quantity
data = ontopint.parse_units(data)
print(data)
"""
{
'@context': {...},
'value': <Quantity(4.0, 'centimeter')>
}
"""

# do something with pint
data["value"] += 3 * ontopint.ureg.meter
data["value"] = data["value"].to(ontopint.ureg.meter)
print(data)
"""
{
'@context': {...},
'value': <Quantity(3.04, 'meter')>
}
"""

# export the result as jsonld
data = ontopint.export_units(data)
print(data)
"""
{
"@context": {
"qudt": "http://qudt.org/schema/qudt/",
"qunit": "http://qudt.org/vocab/unit/",
"qkind": "http://qudt.org/vocab/quantkind/",
"unit": {
"@id": "qudt:hasUnit",
"@type": "@id"
},
"quantity": {
"@id": "qudt:hasQuantityKind",
"@type": "@id"
},
"value": "qudt:value"
},
"value": 3.04,
"unit": "qunit:M"
}
"""

Note: more complex examples can be found at tests/data