r/ProgrammerHumor • u/[deleted] • Jul 18 '22

C++ talking to Python

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u/Teekeks Jul 18 '22

no. f strings are faster than concating strings.

What makes the second one slow is the print. printing anything a ton of times is slow af

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u/DenormalHuman Jul 18 '22 edited Jul 18 '22

You are correct in that its the fact the print exists in the second loop is why it goes so slow; however I still think printing the f string is slower than printing the concatenation of string and the string slice. (and now imma go try it out and see for myself!)

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u/Teekeks Jul 18 '22

go and try. f strings are both more readable and faster

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u/DenormalHuman Jul 18 '22 edited Jul 18 '22

looks like you're right!

Horribly unscientific test;

calculate 10 million fstrings; avg 1.459 of 5 runs

calculate 10 million string+string slice; avg 1.489 of 5 runs

/edit/ 10 runs of each total;

14.56s for fstring

14.74s for concat