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).
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: 226 nsec per loop
Interestingly, the 'format' function is slower -
C:\Users\User>python -m timeit -s "x='a'*500; y='b'*500; z='c'*500"
'{}{}{}'.format(x, y, z)
500000 loops, best of 5: 559 nsec per loop
I am using Python 3.7.0 on Windows 10.
Frank Millman
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