Quickest way to concatenate strings
Frank Millman
frank at chagford.com
Fri Oct 12 03:00:40 EDT 2018
On 12/10/2018 08:36, Thomas Jollans wrote:
> On 12/10/2018 07:55, Frank Millman wrote:
> Hi all
>
> > I have often read that the quickest way to concatenate a number of
> > strings is to place them in a list and 'join' them -
> >
> >
> > C:\Users\User>python -m timeit -s "x='a'*500; y='b'*500; z='c'*500"
> > ''.join([x, y, z])
> > 500000 loops, best of 5: 307 nsec per loop
> >
> > I seem to have found a quicker method, using the new 'f' format operator -
>
> If you know beforehand how many strings you're going to have, you might
> as well just use (x + y + z).
>
I tried that, and the âfâ operator is still quicker -
C:\Users\User>python -m timeit -s "x='a'*500; y='b'*500; z='c'*500" x+y+z
1000000 loops, best of 5: 374 nsec per loop
C:\Users\User>python -m timeit -s "x='a'*500; y='b'*500; z='c'*500" f'{x}{y}{z}'
1000000 loops, best of 5: 231 nsec per loop
Frank
More information about the Python-list
mailing list