Re: convert user input to Decimal objects using eval()?

[Julian Hernandez Gomez]

On Tuesday 29 March 2005 03:04, Raymond Hettinger wrote:
> from decimal import Decimal
> import re
>
> number = re.compile(r"((\b|(?=\W))(\d+(\.\d*)?|\.\d+)([eE][+-]?\d{1,3})?)")
> deciexpr = lambda s: number.sub(r"Decimal('\1')", s)
>
> for s in ('1.0001+0.111',
>    '+21.3e-5*85-.1234/81.6',
>    '1.0/7'):
>     print '%s\n  --> %r' % (s, eval(s))
>     s = deciexpr(s)
>     print '%s\n  --> %r\n' % (s, eval(s))

Wow!

Thank you so much!!!

now I can do my simple math function evaluator much more reliable !

Thanks again!

-- 
Julián
--
http://mail.python.org/mailman/listinfo/python-list

convert user input to Decimal objects using eval()?

[Julian Hernandez Gomez]

Hi !

This is maybe a silly question, but...

is there a "easy way" to make eval() convert all floating numbers to Decimal 
objects and return a Decimal?

for example:

eval('1.0001+0.111') --> convert each number to a Decimal object, 
perform the sum and obtain a Decimal object as a result?

maybe a parser is needed, but eval() already do the job, but I need the 
precision that Decimal offers for numerical applications.

Thanks in advance.

-- 
Julián
--
http://mail.python.org/mailman/listinfo/python-list