Support "decimal" module

[Jellby]

Would be possible to support the decimal module, such that e.g. simple_eval('0.1+0.2') gives 0.3 instead of 0.30000000000000004?

[danthedeckie]

You can add this kind of thing yourself trivially:

import decimal
import simpleeval

class DecimalEval(simpleeval.SimpleEval):
    @staticmethod
    def _eval_num(node):
        return decimal.Decimal(node.n)

decimal.getcontext().prec = 1
DecimalEval().eval('0.1+0.2')

returns:

Decimal(0.3)

I'd rather keep simpleeval slim without adding this functionality to the base module. But it's a cool idea! Thanks for asking.