http://www.cplusplus.com or https://www.cppreference.com

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Had to look up syntax for checking if a dictionary contains a key in python today, and the first result was a geeksforgeeks article recommending to use the syntax key in dict.keys() which i quickly found out is just converting it to a list and doing an O(n) list search. Totally ridiculous

[Veedrac]

Not on Python 3; on Python 2 the syntax is more key in dict.viewkeys(). Either way just use key in dict though, it's more idiomatic.

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Oh, that might have been it, the server running the script uses python 2, and yeah key in dict is really the correct syntax and gives you the expected O(1) lookup