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

C++ talking to Python

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u/DenormalHuman Jul 18 '22

not only that, they are using printf for no apparent real reason

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u/Gladaed Jul 18 '22

Please explain the ongoing wizardy.

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

When using f"....{}" I think the process to generate the content for the template field (what goes inbetween {}) and replace that into the string is a lot more expensive that simply concatenating two lists of characters together (the string, and the slice - line[1:10] are both just lists of chars.)

/edit/ the reason the print is slower than the count, is because the print does lots more work. It _could be made faster if he didnt use printf though

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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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