ways to declare empty set variable

[Steve Holden]

Ben Finney wrote:
[...]
> 
> Note that '()' is syntactically null. Parentheses don't declare a
> tuple literal, commas do. Parentheses are for grouping within
> expressions, not specifying type.
> 
Tell that to the interpreter:

 >>> type(())
<type 'tuple'>
 >>> tuple() is ()
True
 >>>

regards
  Steve
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