class_docstr: A class for handling connections and interactions with the Gmail API.
  
  Attributes:
      credentials_file (str): The path to the Google Auth Credentials file for authentication
      and interacting with the Gmail API on behalf of the uesr.
  
      scopes (List[str], Optional): The scopes to use when authenticating with the Gmail API.
class_docstr_tok: ["A","class","for","handling","connections","and","interactions","with","the","Gmail","API",".","Attributes",":","credentials_file","(","str",")",":","The","path","to","the","Google","Auth","Credentials","file","for","authentication","and","interacting","with","the","Gmail","API","on","behalf","of","the","uesr",".","scopes","(","List","[","str","]",",","Optional",")",":","The","scopes","to","use","when","authenticating","with","the","Gmail","API","."]
code: def _parse_parts(self, parts, attachments):
      if not parts:
          return ""
  
      body = ""
      for part in parts:
          if part["mimeType"] == "text/plain":
              part_body = part.get("body", {}).get("data", "")
              body += urlsafe_b64decode(part_body).decode("utf-8")
          elif (
              part["mimeType"] == "multipart/alternative"
              or "parts" in part
          ):
              # Recursively iterate over nested parts to find the plain text body
              body += self._parse_parts(part["parts"], attachments)
          elif (
              part.get("filename")
              and part.get("body")
              and part.get("body").get("attachmentId")
          ):
              # For now just store the attachment details
              attachments.append(
                  {
                      "filename": part["filename"],
                      "mimeType": part["mimeType"],
                      "attachmentId": part["body"]["attachmentId"],
                  }
              )
          else:
              logger.debug(f"Unhandled mimeType: {part['mimeType']}")
  
      return body
  
imports: import json
  from shutil import copyfile
  from collections import OrderedDict
  import requests
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.integrations.utilities.sql_utils import extract_comparison_conditions
  from mindsdb.integrations.libs.api_handler import APIHandler, APITable
  from mindsdb_sql.parser import ast
  from mindsdb.utilities import log
  from mindsdb_sql import parse_sql
  from mindsdb.utilities.config import Config
  import os
  import time
  from typing import List
  import pandas
  from google.auth.transport.requests import Request
  from google.oauth2.credentials import Credentials
  from google_auth_oauthlib.flow import Flow
  from googleapiclient.discovery import build
  from googleapiclient.errors import HttpError
  from email.message import EmailMessage
  from base64 import urlsafe_b64encode, urlsafe_b64decode
  from .utils import AuthException, google_auth_flow, save_creds_to_file
label_desc: Use image node_id 7 for calling the GmailHandler obj's underlying member method code with example usage: obj._parse_parts(parts, attachments) and returns: body, str