I would like to be able to call a specific classmethod on a class name
that is going to be passed from another parameter.  In other words, I
have a call that looks something like:

   x = Foo.bar()

and I would like to generalise this so that I can make this call on any
particular class which provides the bar classmethod.

I have implemented this using exec, like so:

  className = parameters.className
  exec "x = " + className + ".bar()"

but this feels somewhat clumsy.  (I do have the requisite exception
handling to cope with the supplied class not existing or not
implementing the bar method, by the way).

Is there any more Pythonesque way of doing this ?  I guess what I'm
probably looking for is something like the way I understand the send
function works in Ruby
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