Top Python Interview Questions

[alister]

On Sat, 27 May 2017 14:15:07 +1000, Chris Angelico wrote:

> On Sat, May 27, 2017 at 12:19 PM, Steve D'Aprano
> <steve+python at pearwood.info> wrote:
>> On Sat, 27 May 2017 09:37 am, Chris Angelico wrote:
>>
>>> On Sat, May 27, 2017 at 8:56 AM, Larry Martell
>>> <larry.martell at gmail.com>
>>> wrote:
>>>> If they write a loop with range(1,10) they are going in the 'no'
>>>> pile.
>>>> If they write a loop with range(1,11) they go in the maybe pile If
>>>> the write sum([i*i for i in range(1,11)]) and sqrt(sum([i for i in
>>>> range(1,11)])) they are going in the yes pile.
>>>
>>> And if they leave off the square brackets, even better. :)
>>
>> If they leave out the square brackets, the code might be slower.
>>
>> I know that ''.join() is about 30% faster with a list comprehension
>> than a generator expression, but I'm not sure about sum().
> 
> That's probably because "".join() can do two passes over a list, one to
> sum the lengths and one to actually copy data. But summing integers can
> be done without. That said, though, empirical testing seems to show that
> the comprehension is a bit faster. My guess is that that would change on
> larger data sets though.
> 
> ChrisA

Perhaps I am missing something important but does the 2nd example not 
provide the Square Root or the sum not the square?
in which case does it matter how quickly you arrive at an incorrect 
answer? 



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