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我已经定义了一个新的派生维度

[molar_energy] = [energy] / [substance]

但是，如果我执行以下操作，它会抱怨：

>>> UR.get_compatible_units('[molar_energy]')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/cedric/.local/share/virtualenvs/MatDB--uGOYMXa/lib/python3.9/site-packages/pint/registry.py", line 881, in get_compatible_units
    equiv = self._get_compatible_units(input_units, group_or_system)
  File "/Users/cedric/.local/share/virtualenvs/MatDB--uGOYMXa/lib/python3.9/site-packages/pint/registry.py", line 2082, in _get_compatible_units
    ret = super()._get_compatible_units(input_units, group_or_system)
  File "/Users/cedric/.local/share/virtualenvs/MatDB--uGOYMXa/lib/python3.9/site-packages/pint/registry.py", line 1835, in _get_compatible_units
    ret = super()._get_compatible_units(input_units, group_or_system)
  File "/Users/cedric/.local/share/virtualenvs/MatDB--uGOYMXa/lib/python3.9/site-packages/pint/registry.py", line 891, in _get_compatible_units
    return self._cache.dimensional_equivalents[src_dim]
KeyError: <UnitsContainer({'[length]': 2, '[mass]': 1, '[substance]': -1, '[time]': -2})

我看到上下文中包含一个转换，但我不使用它。我做错了什么？

谢谢你的帮助

PS：记录的问题https://github.com/hgrecco/pint/issues/1418

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1 回答 1

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只需将解决方案留给同样面临此问题的任何人。

我刚刚添加了一个组合单元并且它有效

# Molar Energy
[molar_energy] = [energy] / [substance]
mol_en = J / mol
于 2021-11-30T09:51:40.440 回答