def isheader(self, line):
        i = line.find(':')
        if i > 0:
            return line[:i].lower()
        return None
Parse email `part` and set it to `text_content`, `html_content` or `attachments`.
dataset/ETHPy150Open ofermend/medicare-demo/socialite/jython/Lib/rfc822.py/Message.isheader--crossover with--dataset/ETHPy150Open frappe/frappe/frappe/email/receive.py/Email.process_part