padding of smaller array to match bigger one with values

zero_pad_gen.py

# output:
# [2.88, 2.88, 2.88, 2.88, 3.2, 3.2, 3.2, 3.2, 3.2, 3.52]
# [2.88, 2.88, 2.88, 3.2, 3.2, 3.2, 3.2, 3.52]
# [2.88, 2.88, 2.88, 0, 3.2, 3.2, 3.2, 3.2, 0, 3.52]

a = [2.88,2.88,2.88,2.88,3.2,3.2,3.2,3.2,3.2,3.52]
b = [2.88,2.88,2.88,3.2,3.2,3.2,3.2,3.52]

def zero_pad_gen(a, b, _sentinel=object()):
    a = iter(a)
    nexta = next(a, _sentinel)
    for bval in b:
        if nexta is _sentinel or bval < nexta:
            yield 0
        else:
            yield nexta
            nexta = next(a, _sentinel)

print(a)
print(b)
print(list(zero_pad_gen(b,a)))