[Tutor] attribute error

[Alan Gauld]

"Sara Johnson" <sarliz73 at yahoo.com> wrote

> I always thought with floats you needed a 0.0.
> I do have some percentages that are less than 1% but more than 0.0.

If  you already have a float value then you can compare it to an int 
and
save the typing. zero means the same in a float comparison as 0.0

If you were trying to do float arithmetic, especially division, you 
need to
exress at least one of the values as a float. The code you originally 
posted
did that by just having a decimal point at the end - which is terrible 
style - but
its more conventional (ie. more readable) to add .0 But

        >fracmiss = 1.0 * numberMissing( z[key].values() ) / nsites

In this case mutiplying by 1.0 seems to be a clumsy way to ensure
a float result when

        >fracmiss = float(numberMissing( z[key].values() )) / nsites

would achieve the same and be more explicit as to purpose.

Alan G