Question about distribution classes

[WarrenWeckesser]

It looks like the distribution parameters are always implemented as read-only private members that are validated when an instance is created, and each distribution provides a "getter" method for each parameter. So it looks like a user can never directly set a parameter in an instance of a distribution. If that is true, couldn't a lot of the validation of the distribution parameters that takes place in functions such as pdf() and cdf() be removed?

(Sorry if I've asked this before. I might have, but now I can't find such a discussion.)

[jzmaddock]

The issue is that in an exception-less environment, (or if exceptions are disabled in the Policy), then it's possible to pass an invalid distribution object to the non-member functions.

[WarrenWeckesser]

Ah, got it.

Perhaps a boolean valid attribute could be added that is set to true in the constructor when the parameters are validated. Then a single boolean could be checked instead of repeatedly revalidating the parameters in all the non-member functions. That would save a few CPU cycles, and a few lines of code in each function. Not sure it is worth it though.