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From: Peter Otten <__peter__@web.de>
Subject: Re: python string, best way to concat
Date: Thu, 28 Aug 2014 00:59:30 +0200
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References: <55bab2a0-e0bc-4398-90b4-c9937498f5d8@googlegroups.com> <53FE5EDD.9020502@mrabarnett.plus.com> <20140827174446.11a1cd01@bigbox.christie.dr>
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Xref: csiph.com comp.lang.python:77174

Tim Chase wrote:

> On 2014-08-27 23:42, MRAB wrote:
>> How many parameters are there? len(self.param)
>> 
>> Make that many placeholders and then join them together with commas:
>> 
>> ', '.join(['?'] * len(self.param))
> 
> I prefer the clarity of Peter Otten's suggestion of
> 
>   ', '.join('?' * len(self.param))
> 
> over the mild obscurity of putting it in a list before multiplying.

As long as the OP doesn't try to transfer this to other paramstyles:

>>> ", ".join(["%s"]*3)
'%s, %s, %s'
>>> ", ".join("%s"*3) # OOPS
'%, s, %, s, %, s'