Build attachment mock. Make sure your content is base64 encoded before passing into attachment.content.
    Another example: https://github.com/sendgrid/sendgrid-python/blob/master/use_cases/attachment.md

def build_attachment1():
    """Build attachment mock. Make sure your content is base64 encoded before passing into attachment.content.
    Another example: https://github.com/sendgrid/sendgrid-python/blob/master/use_cases/attachment.md"""
    attachment = Attachment()
    attachment.content = ("TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQsIGNvbnNl"
                          "Y3RldHVyIGFkaXBpc2NpbmcgZWxpdC4gQ3JhcyBwdW12")
    attachment.type = "application/pdf"
    attachment.filename = "balance_001.pdf"
    attachment.disposition = "attachment"
    attachment.content_id = "Balance Sheet"
    return attachment