How can I make this Python script add a limit to trades made with API?

[streetlaw]

I'm putting together a python script to make trades on poloniex with the API, and so far I've got it to make trades when certain conditions are met, but I still need it to NOT place anymore trades for the rest of that day (I have the entire script looping every 60 seconds).

So far I have this script:

import requests import urllib.request import urllib.parse import http.client import hashlib import hmac import time import json from urllib.request import urlopen The_Currency_Pair = input('Which Currency Pair?\nPAIRS TO CHOOSE FROM:\nUSDT_BTC\nUSDT_XRP\nUSDT_ETH\nUSDT_BCH\nUSDT_STR\nUSDT_LTC\nUSDT_ETC\nUSDT_XMR\n') api = 'https://poloniex.com/tradingApi' key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXX' secret = 'XXXXXXXXXXXXXXXXXXXXXXXXX' def main(): poloniexPrices = urlopen('https://poloniex.com/public?command=returnTicker').read() poloniexjson = json.loads(poloniexPrices) poloniexlastP = poloniexjson[The_Currency_Pair]['last'] poloniexOCHL = urlopen('https://poloniex.com/public?command=returnChartData&currencyPair=USDT_BCH&start=1538352000&period=86400').read() poloniexOCHLjson = json.loads(poloniexOCHL) poloniexlasthigh = poloniexOCHLjson[-2]['high'] print ('Last Price') print (poloniexlastP) print ('----------------------------------------') print ('Last Day High') print (poloniexlasthigh) print ('----------------------------------------') data = { 'command': 'returnBalances', 'nonce' : int(time.time() * 1000) } data = urllib.parse.urlencode(data).encode() signature = hmac.new(secret.encode(), data, hashlib.sha512) headers = { 'Key' : key, 'Sign': signature.hexdigest() } request = urllib.request.Request( url=api, data=data, headers=headers, method='POST' ) text = urllib.request.urlopen(request).read().decode() print ('MY ACCOUNT BALANCE') try: print(json.loads(text)['USDT']) except: print(text) print ('-----------------------------------------') if float(poloniexlastP) > 0: print ('PLACING TRADE') print ('-----------------------------------------------') parms = {"command":"buy", "currencyPair":The_Currency_Pair, "rate":100, "immediateOrCancel":1, "amount":0.01, "nonce":int(time.time() * 1000)} parms = urllib.parse.urlencode(parms).encode() signature = hmac.new(secret.encode(), parms, hashlib.sha512) headers = {'Key' : key, 'Sign': signature.hexdigest()} request = urllib.request.Request( url=api, data=parms, headers=headers, method='POST') text = urllib.request.urlopen(request).read().decode() ordernumber = (json.loads(text)['orderNumber']) print ('Order Number:') print (ordernumber) while True: main() time.sleep(60)

Anyway, after a trade has been placed, I need it to make sure that after the 60 second sleep, it doesn't make a second trade unless it is a new day/the day after the trade was made. (Could I use poloniex server time for this?)

So, if it has got as far as print (ordernumber) that means it has placed a trade. But how do I mark it as placed trade for the day or something and use it in the if float(poloniexlastP) > 0: for the next loop to make sure it doesn't place another one?