added examples/py/async-gdax-fetch-ticker-continuously.py ccxt#794

examples/py/async-gdax-fetch-ticker-continuously.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+
+import asyncio
+import os
+import sys
+
+root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+sys.path.append(root + '/python')
+
+import ccxt.async as ccxt  # noqa: E402
+
+
+async def main(exchange, symbol):
+    while True:
+        print('--------------------------------------------------------------')
+        print(exchange.iso8601(exchange.milliseconds()), 'fetchin', symbol, 'ticker from', exchange.name)
+        # this can be any call instead of fetch_ticker, really
+        ticker = await exchange.fetch_ticker(symbol)
+        print(exchange.iso8601(exchange.milliseconds()), 'fetched', symbol, 'ticker from', exchange.name)
+        print(ticker)
+
+
+# you can set enableRateLimit = True to enable the built-in rate limiter
+# this way you request rate will never hit the limit of an exchange
+# the library will throttle your requests to avoid that
+
+exchange = ccxt.gdax({
+    'enableRateLimit': True,  # this option enables the built-in rate limiter
+})
+
+asyncio.get_event_loop().run_until_complete(main(exchange, 'LTC/USD'))