'Writes a common header for the generated files.'

def _get_header(self):

    code_lines = []
    tmp = (header_comment % {'version': sympy_version, 'project': self.project})
    for line in tmp.splitlines():
        if (line == ''):
            code_lines.append('#\n')
        else:
            code_lines.append(('#            %s\n' % line))
    return code_lines
