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From: Tim Chase <python.list@tim.thechases.com>
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Subject: Re: one-element tuples [Was: Most probably a stupid question, but I still want to ask]
Date: Sun, 10 Apr 2016 19:46:35 -0500
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Xref: csiph.com comp.lang.python:106864

On 2016-04-11 01:33, MRAB wrote:
> A one-element tuple can be written as:
> 
>  >>> ('hello',)  
> ('hello',)
> 
> As has been said already, it's the comma that makes the tuple. The 
> parentheses are often needed to avoid ambiguity.

Except when the comma *doesn't* make the tuple:

   >>> t = ()
   >>> type(t)
   <class 'tuple'>

;-)

-tkc