详解python websocket获取实时数据的几种常见链接方式

第一种, 使用create_connection链接，需要pip install websocket-client (此方法不建议使用，链接不稳定，容易断，并且连接很耗时)

import time
from websocket import create_connection

url = 'wss://i.cg.net/wi/ws'
while True: # 一直链接，直到连接上就退出循环
 time.sleep(2)
 try:
   ws = create_connection(url)
   print(ws)
   break
 except Exception as e:
   print('连接异常：', e)
   continue
while True: # 连接上，退出第一个循环之后，此循环用于一直获取数据
 ws.send('{"event":"subscribe", "channel":"btc_usdt.ticker"}')
 response = ws.recv()
 print(response)

第二种,运行效果很不错，很容易连接，获取数据的速度也挺快

import json
from ws4py.client.threadedclient import WebSocketClient

class CG_Client(WebSocketClient):

def opened(self):
   req = '{"event":"subscribe", "channel":"eth_usdt.deep"}'
   self.send(req)

def closed(self, code, reason=None):
   print("Closed down:", code, reason)

def received_message(self, resp):
   resp = json.loads(str(resp))
   data = resp['data']
   if type(data) is dict:
     ask = data['asks'][0]
     print('Ask:', ask)
     bid = data['bids'][0]
     print('Bid:', bid)

if __name__ == '__main__':
 ws = None
 try:
   ws = CG_Client('wss://i.cg.net/wi/ws')
   ws.connect()
   ws.run_forever()
 except KeyboardInterrupt:
   ws.close()

第三种，其实和第一种差不多，只不过换种写法而已，运行效果不理想，连接耗时，并且容易断

import websocket

while True:
 ws = websocket.WebSocket()
 try:
   ws.connect("wss://i.cg.net/wi/ws")
   print(ws)
   break
 except Exception as e:
   print('异常：', e)
   continue
print('OK')
while True:
 req = '{"event":"subscribe", "channel":"btc_usdt.deep"}'
 ws.send(req)
 resp = ws.recv()
 print(resp)

第四种，运行效果也可以，run_forever里面有许多参数，需要自己设置

import websocket

def on_message(ws, message): # 服务器有数据更新时，主动推送过来的数据
 print(message)

def on_error(ws, error): # 程序报错时，就会触发on_error事件
 print(error)

def on_close(ws):
 print("Connection closed ……")

def on_open(ws): # 连接到服务器之后就会触发on_open事件，这里用于send数据
 req = '{"event":"subscribe", "channel":"btc_usdt.deep"}'
 print(req)
 ws.send(req)

if __name__ == "__main__":
 websocket.enableTrace(True)
 ws = websocket.WebSocketApp("wss://i.cg.net/wi/ws",
               on_message=on_message,
               on_error=on_error,
               on_close=on_close)
 ws.on_open = on_open
 ws.run_forever(ping_timeout=30)

来源：https://blog.csdn.net/Darkman_EX/article/details/82592118