What is the most pythonic way to build up large strings?

[Asaf Las]

On Saturday, February 8, 2014 11:56:46 AM UTC+2, cstru... at gmail.com wrote:
> On Saturday, February 8, 2014 3:13:54 AM UTC-5, Asaf Las wrote:
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> > note, due to strings are immutable - for every line in sum operation 
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> > above you produce new object and throw out older one. you can write 
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> > one string spanned at multiple lines in very clear form. 
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> I get what your saying here about immutable strings.  
> Is there anyway efficiently build large strings with 
> lots of conditional inclusions, repetitive sections 
> built dynamically by looping (see the field section above)etc.  
> Is there a mutable string class?

Check this approach if it suits you:

str_t= '<script type="text/javascript' \
    '<src="/{0}/jquery/jqueryui.js"></script>' \
    '<script type="text/javascript'\
    'src="/{1}/jquery/jquery.js"></script>'.format('bella', 'donna')

print(str_t)