convert string number to real number - ValueError: invalid literal for int() with base 10: '"2"'

[Matthias Bläsing]

Am Wed, 28 May 2008 10:41:51 -0700 schrieb davidj411:

> I like the str2num function approach, but then i get left with a float
> that has more than 2 decimal spaces , i.e. 11.50 becomes
> 11.449999999999999 and round will not fix that.

Welcome to the wonderful world of floating point numbers. For your usage 
you want 10-based numbers. Have a look at the decimal module:

>>> from  decimal import Decimal
>>> a = Decimal("11.45")
>>> a
Decimal("11.45")
>>> str(a)
'11.45'
>>> a + 1
Decimal("12.45")
>>> a + Decimal("1.55")
Decimal("13.00")

HTH

Matthias