Copy constructors

[Aahz Maruch]

In article <3B72DCBA.C99465BC at labs.agilent.com>,
David Smith  <drs at labs.agilent.com> wrote:
>
>It appears that the preferred way to make a copy constructor is to
>define the __copy__ method.  In the examples I have seen, __copy__ then
>creates a new object in the usual way, which invokes __init__.  In a
>class I have at hand, __init__ does some real work, which I want to
>bypass -- I want to clone the results of that work.  I don't want to
>redefine __init__'s parameter list (to permit passing only one parameter
>of the same class), because it would screw up IDLE's automatic parameter
>list prompting.

I don't understand that last sentence.  How does permitting only one
argument screw up IDLE?
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