None in string formatting

[Steven Bethard]

rodney.maxwell at gmail.com wrote:
> Was doing some string formatting, noticed the following:
> 
>>>>x = None
>>>>"%s" % x
> 
> 'None'
> 
> Is there a reason it maps to 'None'? I had expected ''.

Can you explain why you expected that?  A few other examples that make 
me not expect what you do:

py> '%s' % False
'False'
py> '%s' % []
'[]'
py> '%s' % {}
'{}'
py> '%s' % set()
'set([])'

All of the objects above evaluate to False in a boolean context like '' 
does, but they display a string appropriate to their type.  Since None 
has it's own type (NoneType), I would expect similar behavior.

STeVe