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Home/ Questions/Q 3231066
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Editorial Team
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Editorial Team
Asked: May 17, 20262026-05-17T17:00:05+00:00 2026-05-17T17:00:05+00:00

A common speedup for string concatenations is changing something like s = for x

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A common speedup for string concatenations is changing something like

s = ""
for x in list:
    s += some_function(x)

to

slist = [some_function(elt) for elt in somelist]
s = "".join(slist)

However, how could this apply if your ‘for’ was doubly nested? For example…

s = ""
for x in list:
    for y in x:
        s += some_function(y)
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  1. Editorial Team
    Editorial Team
    2026-05-17T17:00:05+00:00Added an answer on May 17, 2026 at 5:00 pm
    ''.join(func(c) for s in somelist for c in s)
    
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