count the longest line of consecutive True along an axis

consecutive.py

def consecutive(cond, axis):
    cond = np.moveaxis(cond, axis, -1)
    measure = np.zeros(cond.shape[:-1], dtype=np.uint32)
    diff = np.diff(cond)
    for index in np.ndindex(measure.shape):
        boundary = np.flatnonzero(diff[index])
        if not len(boundary):
            continue
        if cond[index][0]:
            boundary = np.insert(boundary, 0, -1)
        if len(boundary) % 2:
            boundary = np.append(boundary, len(diff[index]))
        measure[index] = np.max(boundary[1::2] - boundary[0::2])
    return measure