> > If you always convert the values back to strings then you could
> > just hold onto the original strings by storing them in a (str, val) tuple.
> > If you do calculations and modify anmy of them then convert the
> > value/string there and then and modify the tuple. You could even
> > make it a class with the convertion fiunctions being methods.
> This is too complex and the speed is good enough for 2000 lines in the
> file. however...
Fair enough, I suspected as much.
> I am doing this to learn about python and programming. So I am
> interested how this class would look like. Could you give an example
> or point me in the right direction how I can figure it out for myself?
You just nered to define a class that can take a string and has
methods to return the value. You could store both string and value
as attributes and have two methods to convert between them. Here
is a very simple example:
>>> class Value:
... def __init__(self, vs = ""):
... self.vs = vs
... self.v = self.asInt()
... def asInt(self):
... try: self.v = int(self.vs)
... except: self.v = None
... return self.v
... def asString(self):
... vs = str(self.vs)
... return self.vs
... def setStringValue(self, s):
... self.vs = s
... self.asInt()
... def setIntValue(self, i):
... self.v = int(i)
... self.vs = str(self.v)
...
>>> v = Value('42')
>>> print v.v, v.vs
42 42
>>> v.setStringValue('66')
>>> print v.v, v.vs
66 66
>>> v.setIntValue(7)
>>> print v.v, v.vs
7 7
>>>
HTH,
Alan G.
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
