pyparsing / plusminus Goto Github PK

I'd like there be an option like parser = BaseArithmeticParser(numerical_types=[int, Decimal, complex]) where if numerical_types=None it would default to the value numerical_types=[int, float, complex] so that when I'm dealing with monetary values I can be confident that the answer IS EXACT, not really super close.

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The result of below code evaluation should be true, but it returns False instead.

from plusminus import BaseArithmeticParser

parser = BaseArithmeticParser()
parser.evaluate('False or False or True')

I'm trying to use this project in a spark distributed environment, but encountered a "RecursionError: maximum recursion depth exceeded". After some debugging, I found this is because the parser and parsed_rule can not be de-serialized.

Below is a sample code to reproduce the error:

import cloudpickle
from plusminus import ArithmeticParser

parser = ArithmeticParser()
parsed_res = parser.parse(' A + B')
parsed_pair = cloudpickle.dumps((parser, parsed_res))
parser, parsed_res = cloudpickle.loads(parsed_pair)

Hi,

Thanks for your great work on pyparsing and plusminus.

I am searching for a parser working on pandas Series with variables.
This looks to work out of the box with plusminus (mapping all series of a dataframe to variables)
For a 1:1 adaption it would be fine to have a different identifier definition.

As the data columns i am working (they come from external CSV) on may contain spaces i would like to define a variable as

var_name = pp.QuotedString('[', endQuoteChar=']').setName("identifier")

which currently requires a copy and paste of your library.

Christoph

plusminus is a project of 2 minds:

• being a safe alternative to Python eval()
• implementing common arithmetic notations and operations, often using Unicode operators or notation that are not supported in Python (such as |x| for abs(x))

These two goals should be split into separate parser classes, so that "programming-ish" concepts do not necessarily bleed over into arithmetic notations, and arithmetic expressions like |x| are not included in safe Python eval() support.