Hi, I have found bug in functools.reduce (Python V 3.6.5). The function ignores the value of initializer, if initializer is zero. Below is the example code import functools as f ar = [2, 5, 4, 1, 3] out = f.reduce(lambda prev, curr: prev < curr and prev or curr, ar, 0) print(out)

...

Expected: 0 Actual: 1

out2 = f.reduce(lambda prev, curr: prev < curr and prev or curr, ar, -1) print(out2)

...

Expected: -1 Actual: -1

Best Regards, Witthawat P.