Creating anonymous functions using eval

[Devan L]

Well, the string that gets passed is more or less a function
definition, which is then called with exec. I don't see why you'd need
to write a string out with the function definition and then call it.
You could just write the function.

As for the nested functions, I had been presuming that it was intended
to use as a better function than lambda within a function. Sorry for
the confusion.