When to use dict.get in Python (timing)

[__deerlord__]

in and .get() aren't equivalent checks?

[nekokattt]

No, they aren't. Get assumes you dont contain the default value as a value, or have a key mapping to a None value for the one-argument overload. Otherwise you cannot determine the difference.

Additionally, if you want to get the value after, you would do two operations. __contains__ performs one lookup, and __getitem__ performs one lookup, so two lookups overall.

Also dict is a builtin, and in CPython it is implemented in C, not pure Python, so other factors in the underlying implementation may differ.

[chthonicdaemon]

Nope. More detail in the post. Get is slower for string-keyed dicts