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In message <[email protected]> you wrote:

> I can write
> 
> s="xxxxxxxx"
> print(s:upper())
> 
> why not
> 
> "xxxxxxxxxx":upper()
> 
> ?

Because "xxxxxxxxxx" is not an identifier but an expression?
Try ("xxxxxxxxxx"):upper() .

-- 
Gavin Wraith ([email protected])
Home page: http://www.wra1th.plus.com/