SyntaxError when using " and ' for inches and feet

[wolph]

Perhaps this has already been reported but I couldn't find a bugreport or something.

The parser seems to be unable to process units like " and '. Is this something that's fixable?

[wolph]

Example traceback:

Traceback (most recent call last):
  File "convert.py", line 64, in convert
    in_val = Q_(value)
  File "pint/quantity.py", line 93, in __new__
    inst = cls._REGISTRY.parse_expression(value)
  File "pint/unit.py", line 1175, in parse_expression
    values
  File "<string>", line 1
    10 "

[wolph]

My definition:

" = inch

[hgrecco]

The parser is currently builds on top of the python parser and is therefore limited. There is plan for changing this at same point but it has not been a priority. There are few issues we could address with a custom one (See #145, #78, #34 and #25)

There is a way to achieve what you need using a private API. Basically every string that is going to be parsed goes through a string_preprocessor doing some replacements. See here. You could add your own replacement rule.

[hgrecco]

I am closing this in favor of #226