@property
def start_blank_lines(self):
    i = None
    if self.raw_doc:
        for (i, row) in enumerate(self.raw_doc.split('\n')):
            if row.strip():
                break
    return i
@property
def start_blank_lines(self):
    i = None
    if self.raw_doc:
        for (i, row) in enumerate(self.raw_doc.split('\n')):
            if row.strip():
                break
    return i