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Groups > comp.lang.python > #77186

Re: python string, best way to concat

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On 2014-08-27 23:59, Peter Otten wrote:
> 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'
 >
I chose the list form for just this reason, because the OP said he was
"very new to Python".

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python string, best way to concat dennisearlevans@gmail.com - 2014-08-27 13:31 -0700
  Re: python string, best way to concat Dan Stromberg <drsalists@gmail.com> - 2014-08-27 15:30 -0700
  Re: python string, best way to concat Peter Otten <__peter__@web.de> - 2014-08-28 00:34 +0200
  Re: python string, best way to concat MRAB <python@mrabarnett.plus.com> - 2014-08-27 23:42 +0100
  Re: python string, best way to concat Tim Chase <python.list@tim.thechases.com> - 2014-08-27 17:44 -0500
  Re: python string, best way to concat Chris Angelico <rosuav@gmail.com> - 2014-08-28 08:55 +1000
  Re: python string, best way to concat Peter Otten <__peter__@web.de> - 2014-08-28 00:59 +0200
  Re: python string, best way to concat MRAB <python@mrabarnett.plus.com> - 2014-08-28 08:12 +0100
  Re: python string, best way to concat peter <peter.mosley@talk21.com> - 2014-08-28 01:30 -0700
    Re: python string, best way to concat Marko Rauhamaa <marko@pacujo.net> - 2014-08-28 11:34 +0300
    Re: python string, best way to concat Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-28 09:43 +0100
    Re: python string, best way to concat Chris Angelico <rosuav@gmail.com> - 2014-08-28 18:58 +1000
    Re: python string, best way to concat Roy Smith <roy@panix.com> - 2014-08-28 08:08 -0400
      Re: python string, best way to concat Mihamina Rakotomandimby <mihamina.rakotomandimby@rktmb.org> - 2014-08-28 15:19 +0300
      Re: python string, best way to concat Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-28 15:48 +0100

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