On 2015.04.29 04:08, Mark Lawrence wrote:
> On 29/04/2015 09:29, Cecil Westerhof wrote:
>> Because I try to keep my lines (well) below 80 characters, I use the
>> following:
>> print('Calculating fibonacci and fibonacci_memoize once for ' +
>> str(large_fibonacci) + ' to determine speed increase')
>>
>> But I was told that using + with strings was bad practice. Is this
>> true? If so, what is the better way to do this?
>>
>
> It's not bad practice as such, it's simply that performance takes a nose
> dive if you're contatenating large numbers of strings. If performance
> is an issue the recommended way is to write.
>
> ' '.join(strings)
>
I thought it was frowned upon because it's less readable for anything
non-trivial.
hero1 = 'Batman'
hero2 = 'Robin'
villain = 'The Joker'
place = 'Gotham City'
sentence = hero1 + " and " + hero2 + " fight " + villain + " in " + place + "."
# doesn't flow as well as:
sentence = "{hero1} and {hero2} fight {villain} in {place}.".format(
hero1=hero1,hero2=hero2,villain=villain,place=place)
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