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From: Laurent Claessens <moky.math@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: What is this syntax ?
Date: Sun, 19 Jun 2011 15:50:29 +0200
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Le 19/06/2011 15:41, candide a écrit :
> With Python 2.7 :
>
>   >>>  x="foo"
>   >>>  print '"'+x+'"'
> "foo"
>   >>>
>
>
> What is this curious syntax on line 2 ? Where is it documented ?

When you want to have an explicit double quote " in a string, you put in 
between single quote '.
(and vice versa)

So here you have the string
'"'
which is "
then
+x
(add x)
then
+'"'

Try also

 >>> print "'"
'
 >>> print "'"
"

Laurent