No one is faster: https://stackoverflow.com/questions/26540885/lambda-is-slower-than-function-call-in-python-why

lambda is indeed faster, but according to the PEP8, it is preferable to use the def statement

i think lambda is faster than def, maybe not sure tho

It seems to me that all previous years were better, since the point is not in readability, but in the beauty of the code)