Retrieve normal sample if normal/turmor

def get_normal_sample(in_file):
    """Retrieve normal sample if normal/turmor
    """
    with utils.open_gzipsafe(in_file) as in_handle:
        for line in in_handle:
            if line.startswith("##PEDIGREE"):
                parts = line.strip().split("Original=")[1][:-1]
                return parts