import math


def code_header(text):
    """
    Insert section header into a jinja file, formatted as Python comment.
    
    Leave 2 blank lines before the header.
    """
    seperator_len = (75 - len(text)) / 2
    seperator_len_left = math.floor(seperator_len)
    seperator_len_right = math.ceil(seperator_len)
    return f"# {'-' * seperator_len_left} {text} {'-' * seperator_len_right}"