I'm using Python3 and getting different results when using // versus math.floor (other than return types).
My problem:
print('Using //: ', 1.0 // 0.2)
print('Using math.floor: ', math.floor(1.0 / 0.2))
Output:
Using //: 4.0
Using math.floor: 5
To me these should return the same results. PEP 238 says the following:
Floor division will be implemented in all the Python numeric types, and will have the semantics of:
a // b == floor(a/b)except that the result type will be the common type into which a and b are coerced before the operation.
To me, this says that floor(a/b), when both a and b are floats, should return the same result. (Assuming that math.floor does floor division the same way as discussed in PEP 238). What major aspect of // am I missing that causes these results?
For system notes, I'm running Python 3.8.5 on MacOS within a virtual environment.
Edit
A rounding error might be the culprit, as 1.0 // 0.19 does return 5.0. However, why is the same error not apparent using math.floor?