class_docstr: A class for handling connections and interactions with the Binance API.
  
  Attributes:
      client (binance.spot.Spot): The `binance.spot.Spot` object for interacting with the Binance API.
      api_key (str): API key, only required for user data endpoints.
      api_secret (str): API secret, only required for user data endpoints.
      is_connected (bool): Whether or not the API client is connected to Binance.
docstr: Creates a new Binance Spot API client if needed and sets it as the client to use for requests.
  
  Returns newly created Binance Spot API client, or current client if already set.
docstr_tok: ["Creates","a","new","Binance","Spot","API","client","if","needed","and","sets","it","as","the","client","to","use","for","requests",".","Returns","newly","created","Binance","Spot","API","client",",","or","current","client","if","already","set","."]
code: def connect(self) -> Spot:
      """Creates a new Binance Spot API client if needed and sets it as the client to use for requests.
  
      Returns newly created Binance Spot API client, or current client if already set.
      """
      if self.is_connected is True and self.client:
          return self.client
  
      if self.api_key and self.api_secret:
          self.client = Spot(
              key=self.api_key,
              secret=self.api_secret,
              base_url=_BASE_BINANCE_US_URL,
          )
      else:
          self.client = Spot(base_url=_BASE_BINANCE_US_URL)
  
      self.is_connected = True
      return self.client
  
file_path: mindsdb/mindsdb/integrations/handlers/binance_handler/binance_handler.py
imports: import pandas
  from typing import Dict
  from binance.spot import Spot
  from mindsdb.integrations.handlers.binance_handler.binance_tables import BinanceAggregatedTradesTable
  from mindsdb.integrations.libs.api_handler import APIHandler
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse
  from mindsdb.utilities import log
  from mindsdb_sql import parse_sql
label_desc: Use image node_id 2 for calling the BinanceHandler obj's underlying member method code with example usage: obj.connect() and returns: self, self