[Tutor] Noob question

[Eric Brunson]

Hi Amit,

This is fairly inefficient.  Because strings in python are immutable 
this approach causes a new string to be created every iteration.  While 
it may not be an issue with just 3 strings, it is much better to create 
your list and use "".join() to create the concatenation after the list 
is complete.  When you get used to it, it's a bit more concise and 
readable, also.

Sincerely,
e.

Amit Saxena wrote:
> The simplest way i could think of:
>
> a=["apple","orange","banana"]
> b = ""
> for i in range(len(a)):
>      b += a[i]
> print b
>
>
> Amit
>
> On Dec 10, 2007 6:48 AM, Alan Gauld <alan.gauld at btinternet.com 
> <mailto:alan.gauld at btinternet.com>> wrote:
>
>     "Eric Walstad" <eric at ericwalstad.com
>     <mailto:eric at ericwalstad.com>> wrote
>
>     > You could also achieve the same result of concatenating a list of
>     > strings by looping over the list items like so:
>     >
>     > b = ''
>     > for fruit in a:
>     >    b += fruit
>     >
>     > print b
>
>     And to add to the options you could use the formatting operator
>     provided you know there are only 3 items,
>
>     b = "%s%s%s" % tuple(a)
>
>     Or for an indefinite number of strings:
>
>     b = "%s" * len(a)
>     b = b % tuple(a)
>
>     So many options. However, to the OP, if you get stuck in
>     future its best if you post the erroneous code that you have tried,
>     then we can better see where you have gone wrong and thus
>     provide clearer guidance on how to fix it. Its better to learn to
>     do it your own way correctly than just to see other folks
>     attempts .
>
>     HTH,
>
>     --
>     Alan Gauld
>     Author of the Learn to Program web site
>     http://www.freenetpages.co.uk/hp/alan.gauld
>
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