Python Classes and dynamic class members

[acatejr at gmail.com]

James Stroud wrote:
> acatejr at gmail.com wrote:
> > I have a text file that I am parsing.  Each line is of the form:
> >
> > max_time  0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12
> >
> > The first item is the field name and the next twelve items are values
> > for each month in the year.  There are multiple lines each for some
> > different variable.  I am able to parse this data easily enough, but
> > what I'd like to do is have a class that stores all this infomormation
> > using dynamic member attributes/fields and the resulting list of
> > values.  For example, if the class WeatherData was instantiated and I
> > parsed the line above as so:
> >
> > field_name = "max_time;
> > values = [0.01,0.02,0.03,0.04,0.05,0.06,0.07,0.08,0.09,0.10,0.11,0.12]
> >
> > how could I get weather data to store values in an attribute called
> > "max_time"?  Ultimately, something like this would be possible:
> >
> >
> >>>>WeatherData.max_time
> >>>>[0.01,0.02,0.03,0.04,0.05,0.06,0.07,0.08,0.09,0.10,0.11,0.12]
> >
> >
> > Any help would be appreciated.
> >
> setattr(Weatherdata, "max_time", max_time)
>
> --
> James Stroud
> UCLA-DOE Institute for Genomics and Proteomics
> Box 951570
> Los Angeles, CA 90095
>
> http://www.jamesstroud.com/

Thanks a lot!!

I did find that creating and calling the following method works too:

def setAt(self, field, data):
    expression = "self." + field + " = data"
    exec(expression)

I just don't know which one would be more efficient, but I like setattr
better.