3. Resample live feed from CCXT problem
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Resample live feed from CCXT problem


  • Guys,

    I'm trying to get macd of 1minute and 5minute timeframe.
    But I'm getting ValueError: min() arg is an empty sequence error.

    Here's the script:

    # !/usr/bin/env python
# -*- coding: utf-8; py-indent-offset:4 -*-
from __future__ import (absolute_import, division, print_function,
                        unicode_literals)
import sys
import time
from datetime import datetime, timedelta
from datetime import datetime, timedelta

import backtrader as bt
import ccxt

class TestStrategy(bt.Strategy):
    params = (
        ('printlog', True),
    )

    def log(self, txt, dt=None, doprint=False):
        ''' Logging function fot this strategy'''
        if self.params.printlog or doprint:
            dt = dt or bt.num2date(self.data.datetime[0])
            print('%s, %s' % (dt, txt))

    def start(self):
        self.counter = 0
        print('START')

    def prenext(self):
        self.counter += 1
        print('prenext len %d - counter %d' % (len(self), self.counter))
        self.log("data#0: " + str(self.datas[0].datetime[0]))
        self.log("data#1: " + str(self.datas[1].datetime[0]))

    def __init__(self):
        self.macd = bt.indicators.MACDHisto(self.datas[0])
        self.macd2 = bt.indicators.MACDHisto(self.datas[1])


    def next(self):
        self.counter += 1
        price_txt = "Counter: " + str(self.counter) + " Open/Close/High/Low/Volume: " + str(self.data0.open[0]) + " - "+ str(self.data0.close[0]) + " - " + str(self.data0.high[0]) + " - " + str(self.data0.low[0])  + " - " + str(self.data0.volume[0]) + " Len: "+ str(len(self.data0))# + " Time Frame:" + bt.TimeFrame.getname(self.data0._timeframe) + " Len: "+ str(len(self.data0))
        self.log(price_txt)
        macd_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd.macd[0],self.macd.histo[0])
        self.log("MACD#1: " + macd_txt)
        macd2_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd2.macd[0],self.macd2.histo[0])
        self.log("MACD#2: " + macd2_txt)

if __name__ == '__main__':
    cerebro = bt.Cerebro()

    #exchange = sys.argv[1] if len(sys.argv) > 1 else 'gdax'
    exchange = sys.argv[1] if len(sys.argv) > 1 else 'okex'
    symbol = sys.argv[2] if len(sys.argv) > 2 else 'ETH/USDT'

    hist_start_date = datetime.utcnow() - timedelta(minutes=10)
    print('UTC NOW: ', datetime.utcnow())
    print('hist_start_data: ', hist_start_date)
    print('Using symbol: ', symbol)

    # Create data feeds
    data_1m = bt.feeds.CCXT(exchange=exchange, symbol=symbol, name="1m",
                               timeframe=bt.TimeFrame.Minutes, fromdate=hist_start_date,compression=1)
    cerebro.adddata(data_1m)

    cerebro.replaydata(data_1m, timeframe=bt.TimeFrame.Minutes, name="2m",compression=2)
    
    
    cerebro.addstrategy(TestStrategy)
    cerebro.run()

    And the output:

    $ python stage1.py
UTC NOW:  2019-06-21 08:33:35.360573
hist_start_data:  2019-06-21 08:23:35.360331
Using symbol:  ETH/USDT
START
dts[]:  [737231.35, 737231.35]
prenext len 1 - counter 1
2019-06-21 08:24:00, data#0: 737231.35
2019-06-21 08:24:00, data#1: 737231.35
dts[]:  [737231.3506944445, None]
prenext len 2 - counter 2
2019-06-21 08:25:00, data#0: 737231.3506944445
2019-06-21 08:25:00, data#1: 737231.35
dts[]:  [737231.3513888889, 737231.3513888889]
prenext len 3 - counter 3
2019-06-21 08:26:00, data#0: 737231.3513888889
2019-06-21 08:26:00, data#1: 737231.3513888889
dts[]:  [737231.3520833333, None]
prenext len 4 - counter 4
2019-06-21 08:27:00, data#0: 737231.3520833333
2019-06-21 08:27:00, data#1: 737231.3513888889
dts[]:  [737231.3527777778, 737231.3527777778]
prenext len 5 - counter 5
2019-06-21 08:28:00, data#0: 737231.3527777778
2019-06-21 08:28:00, data#1: 737231.3527777778
dts[]:  [737231.3534722222, None]
prenext len 6 - counter 6
2019-06-21 08:29:00, data#0: 737231.3534722222
2019-06-21 08:29:00, data#1: 737231.3527777778
dts[]:  [737231.3541666666, 737231.3541666666]
prenext len 7 - counter 7
2019-06-21 08:30:00, data#0: 737231.3541666666
2019-06-21 08:30:00, data#1: 737231.3541666666
dts[]:  [737231.3548611111, None]
prenext len 8 - counter 8
2019-06-21 08:31:00, data#0: 737231.3548611111
2019-06-21 08:31:00, data#1: 737231.3541666666
dts[]:  [737231.3555555556, 737231.3555555556]
prenext len 9 - counter 9
2019-06-21 08:32:00, data#0: 737231.3555555556
2019-06-21 08:32:00, data#1: 737231.3555555556
dts[]:  [737231.35625, None]
prenext len 10 - counter 10
2019-06-21 08:33:00, data#0: 737231.35625
2019-06-21 08:33:00, data#1: 737231.3555555556
dts[]:  [None, 737231.3569444445]
Traceback (most recent call last):
  File "stage1.py", line 69, in <module>
    cerebro.run()
  File "/Users/michael/.venv/backtrader-ccxt/lib/python3.6/site-packages/backtrader/cerebro.py", line 1127, in run
    runstrat = self.runstrategies(iterstrat)
  File "/Users/michael/.venv/backtrader-ccxt/lib/python3.6/site-packages/backtrader/cerebro.py", line 1298, in runstrategies
    self._runnext(runstrats)
  File "/Users/michael/.venv/backtrader-ccxt/lib/python3.6/site-packages/backtrader/cerebro.py", line 1558, in _runnext
    dt0 = min((d for i, d in enumerate(dts)
ValueError: min() arg is an empty sequence

    You may not see the below:

    2019-06-21 08:32:00, data#0: 737231.3555555556
2019-06-21 08:32:00, data#1: 737231.3555555556
dts[]:  [737231.35625, None]

    because I changed the source code to print them out.

    Any ideas?

    What am I doing wrong?

    Any help appreciated!

    0
  • B
    administrators

    This seems related to your usage of the CCXT fork, as per your other message:

    The fork will have to handle it.

    0 2 Replies

  • @backtrader Hi Backtrader, I guess not.
    Because I tried bt-ccxt-store too. It's the same error.

    And it's going well if remove the fromdate. And also, leads to a before time point, don't know why.

    Here's goes the bt-ccxt-store version script, which is almost the same:

    
# !/usr/bin/env python
# -*- coding: utf-8; py-indent-offset:4 -*-
from __future__ import (absolute_import, division, print_function,
                        unicode_literals)
import sys
import time
from datetime import datetime, timedelta

import backtrader as bt
from ccxtbt import CCXTFeed

class TestStrategy(bt.Strategy):
    params = (
        ('printlog', True),
    )

    def log(self, txt, dt=None, doprint=False):
        ''' Logging function fot this strategy'''
        if self.params.printlog or doprint:
            dt = dt or bt.num2date(self.data.datetime[0])
            print('%s, %s' % (dt, txt))

    def start(self):
        self.counter = 0
        print('START')

    def prenext(self):
        self.counter += 1
        print('prenext len %d - counter %d' % (len(self), self.counter))

    def __init__(self):
        self.macd = bt.indicators.MACDHisto(self.datas[0])
        self.macd2 = bt.indicators.MACDHisto(self.datas[1])


    def next(self):
        self.counter += 1
        price_txt = "Counter: " + str(self.counter) + " Open/Close/High/Low/Volume: " + str(self.data0.open[0]) + " - "+ str(self.data0.close[0]) + " - " + str(self.data0.high[0]) + " - " + str(self.data0.low[0])  + " - " + str(self.data0.volume[0]) + " Len: "+ str(len(self.data0))# + " Time Frame:" + bt.TimeFrame.getname(self.data0._timeframe) + " Len: "+ str(len(self.data0))
        self.log(price_txt)
        macd_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd.macd[0],self.macd.histo[0])
        self.log("MACD#1: " + macd_txt)
        macd2_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd2.macd[0],self.macd2.histo[0])
        self.log("MACD#2: " + macd2_txt)
    
    def notify_data(self, data, status, *args, **kwargs):
        dn = data._name
        dt = datetime.now()
        msg= 'Data Status: {}'.format(data._getstatusname(status))
        print(dt,dn,msg)
        if data._getstatusname(status) == 'LIVE':
            self.live_data = True
        else:
            self.live_data = False

if __name__ == '__main__':
    #cerebro = bt.Cerebro(quicknotify=True)
    cerebro = bt.Cerebro()

    

    #exchange = sys.argv[1] if len(sys.argv) > 1 else 'gdax'
    exchange = sys.argv[1] if len(sys.argv) > 1 else 'binance'
    symbol = sys.argv[2] if len(sys.argv) > 2 else 'ETH/USDT'

    #store = CCXTStore(exchange=exchange, currency='LTC', config=config, retries=5, debug=False)

    hist_start_date = datetime.utcnow() - timedelta(minutes=10)
    print('UTC NOW: ', datetime.utcnow())
    print('hist_start_data: ', hist_start_date)
    print('Using symbol: ', symbol)

    data = CCXTFeed(exchange=exchange,
                             dataname=symbol,
                             timeframe=bt.TimeFrame.Minutes,
                             #fromdate=hist_start_date,
                             #todate=datetime(2019, 1, 1, 0, 2),
                             compression=1,
                             ohlcv_limit=2,
                             currency='USDT',
                             retries=5,
                             config={'enableRateLimit': True, 'nonce': lambda: str(int(time.time() * 1000))})

    cerebro.adddata(data)
    cerebro.resampledata(data, timeframe=bt.TimeFrame.Minutes, compression=5)

    cerebro.addstrategy(TestStrategy)
    # Run the strategy
    cerebro.run()

    With the following output:

    prenext len 47 - counter 47
prenext len 48 - counter 48
prenext len 49 - counter 49
Traceback (most recent call last):
  File "ccxtbttest.py", line 88, in <module>
    cerebro.adddata(data)
  File "/Users/michael/.venv/bt-ccxt-store/lib/python3.6/site-packages/backtrader-1.9.74.123-py3.6.egg/backtrader/cerebro.py", line 1127, in run
    runstrat = self.runstrategies(iterstrat)
  File "/Users/michael/.venv/bt-ccxt-store/lib/python3.6/site-packages/backtrader-1.9.74.123-py3.6.egg/backtrader/cerebro.py", line 1298, in runstrategies
    self._runnext(runstrats)
  File "/Users/michael/.venv/bt-ccxt-store/lib/python3.6/site-packages/backtrader-1.9.74.123-py3.6.egg/backtrader/cerebro.py", line 1557, in _runnext
    dt0 = min((d for i, d in enumerate(dts)
ValueError: min() arg is an empty sequence
(bt-ccxt-store)

    And also Another script:

       
from ccxtbt import CCXTStore
import backtrader as bt
from datetime import datetime, timedelta


class TestStrategy(bt.Strategy):

    def __init__(self):

        self.sma = bt.indicators.SMA(self.datas[0],period=21)
        #self.macd5 = bt.indicators.MACD(self.datas[1])

    def next(self):

        # Get cash and balance
        # New broker method that will let you get the cash and balance for
        # any wallet. It also means we can disable the getcash() and getvalue()
        # rest calls before and after next which slows things down.

        # NOTE: If you try to get the wallet balance from a wallet you have
        # never funded, a KeyError will be raised! Change LTC below as approriate
        if self.live_data:
            cash, value = self.broker.get_wallet_balance('USDT')
        else:
            # Avoid checking the balance during a backfill. Otherwise, it will
            # Slow things down.
            cash = 'NA'

        for data in self.datas:

            print('{} - {} \t| Cash {} | O: {} H: {} L: {} C: {} V:{} \tSMA:{}'.format(data.datetime.datetime(),
                data._name, cash, data.open[0], data.high[0], data.low[0], data.close[0], data.volume[0],
                self.sma[0]))

    def notify_data(self, data, status, *args, **kwargs):
        dn = data._name
        dt = datetime.now()
        msg= 'Data Status: {}'.format(data._getstatusname(status))
        print(dt,dn,msg)
        if data._getstatusname(status) == 'LIVE':
            self.live_data = True
        else:
            self.live_data = False



apikey = 'x'
secret = 'xx'

cerebro = bt.Cerebro(quicknotify=True)


# Add the strategy
cerebro.addstrategy(TestStrategy)

# Create our store
config = {'apiKey': apikey,
            'secret': secret,
            'enableRateLimit': True
            }

# IMPORTANT NOTE - Kraken (and some other exchanges) will not return any values
# for get cash or value if You have never held any LTC coins in your account.
# So switch LTC to a coin you have funded previously if you get errors
store = CCXTStore(exchange='binance', currency='USDT', config=config, retries=5, debug=False)


# Get the broker and pass any kwargs if needed.
# ----------------------------------------------
# Broker mappings have been added since some exchanges expect different values
# to the defaults. Case in point, Kraken vs Bitmex. NOTE: Broker mappings are not
# required if the broker uses the same values as the defaults in CCXTBroker.
broker_mapping = {
    'order_types': {
        bt.Order.Market: 'market',
        bt.Order.Limit: 'limit',
        bt.Order.Stop: 'stop-loss', #stop-loss for kraken, stop for bitmex
        bt.Order.StopLimit: 'stop limit'
    },
    'mappings':{
        'closed_order':{
            'key': 'status',
            'value':'closed'
            },
        'canceled_order':{
            'key': 'result',
            'value':1}
            }
    }

broker = store.getbroker(broker_mapping=broker_mapping)
cerebro.setbroker(broker)

# Get our data
# Drop newest will prevent us from loading partial data from incomplete candles
hist_start_date = datetime.utcnow() - timedelta(minutes=50)
data = store.getdata(dataname='ETH/USDT', name="ETHUSDT",
                         timeframe=bt.TimeFrame.Minutes, fromdate=hist_start_date,
                         compression=1, ohlcv_limit=50, drop_newest=True) #, historical=True)

# Add the feed
cerebro.adddata(data)
cerebro.resampledata(data, timeframe=bt.TimeFrame.Minutes, compression=5, name="RESAMPLE")

# Run the strategy
cerebro.run()

    which produced the following output:

    2019-06-24 01:45:00 - RESAMPLE 	| Cash NA | O: 304.46 H: 306.21 L: 304.45 C: 306.04 V:1373.65208 	SMA:305.352380952381
2019-06-24 09:48:15.019843 ETHUSDT Data Status: LIVE
2019-06-24 01:48:00 - ETHUSDT 	| Cash 97.0 | O: 305.5 H: 305.55 L: 305.11 C: 305.39 V:306.13727 	SMA:305.31714285714287
2019-06-24 01:45:00 - RESAMPLE 	| Cash 97.0 | O: 304.46 H: 306.21 L: 304.45 C: 306.04 V:1373.65208 	SMA:305.31714285714287
2019-06-24 01:49:00 - ETHUSDT 	| Cash 97.0 | O: 305.46 H: 306.46 L: 305.46 C: 306.46 V:215.59647 	SMA:305.31904761904764
2019-06-24 01:45:00 - RESAMPLE 	| Cash 97.0 | O: 304.46 H: 306.21 L: 304.45 C: 306.04 V:1373.65208 	SMA:305.31904761904764
Traceback (most recent call last):
  File "sample.py", line 107, in <module>
    cerebro.run()
  File "/Users/michael/.venv/bt-ccxt-store/lib/python3.6/site-packages/backtrader-1.9.74.123-py3.6.egg/backtrader/cerebro.py", line 1127, in run
    runstrat = self.runstrategies(iterstrat)
  File "/Users/michael/.venv/bt-ccxt-store/lib/python3.6/site-packages/backtrader-1.9.74.123-py3.6.egg/backtrader/cerebro.py", line 1298, in runstrategies
    self._runnext(runstrats)
  File "/Users/michael/.venv/bt-ccxt-store/lib/python3.6/site-packages/backtrader-1.9.74.123-py3.6.egg/backtrader/cerebro.py", line 1557, in _runnext
    dt0 = min((d for i, d in enumerate(dts)
ValueError: min() arg is an empty sequence
(bt-ccxt-store)
    0

  • @backtrader

    Here's the output of remove fromdate script and output:

    # !/usr/bin/env python
# -*- coding: utf-8; py-indent-offset:4 -*-
from __future__ import (absolute_import, division, print_function,
                        unicode_literals)
import sys
import time
from datetime import datetime, timedelta
from datetime import datetime, timedelta

import backtrader as bt
import ccxt

class TestStrategy(bt.Strategy):
    params = (
        ('printlog', True),
    )

    def log(self, txt, dt=None, doprint=False):
        ''' Logging function fot this strategy'''
        if self.params.printlog or doprint:
            dt = dt or bt.num2date(self.data.datetime[0])
            print('%s, %s' % (dt, txt))

    def start(self):
        self.counter = 0
        print('START')

    def prenext(self):
        self.counter += 1
        print('prenext len %d - counter %d' % (len(self), self.counter))
        self.log("data#0: " + str(self.datas[0].datetime[0]))
        self.log("data#1: " + str(self.datas[1].datetime[0]))

    def __init__(self):
        self.macd = bt.indicators.MACDHisto(self.datas[0])
        self.macd2 = bt.indicators.MACDHisto(self.datas[1])


    def next(self):
        self.counter += 1
        price_txt = "Counter: " + str(self.counter) + " Open/Close/High/Low/Volume: " + str(self.data0.open[0]) + " - "+ str(self.data0.close[0]) + " - " + str(self.data0.high[0]) + " - " + str(self.data0.low[0])  + " - " + str(self.data0.volume[0]) + " Len: "+ str(len(self.data0))# + " Time Frame:" + bt.TimeFrame.getname(self.data0._timeframe) + " Len: "+ str(len(self.data0))
        self.log(price_txt)
        macd_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd.macd[0],self.macd.histo[0])
        self.log("MACD#1: " + macd_txt)
        macd2_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd2.macd[0],self.macd2.histo[0])
        self.log("MACD#2: " + macd2_txt)

if __name__ == '__main__':
    cerebro = bt.Cerebro()

    #exchange = sys.argv[1] if len(sys.argv) > 1 else 'gdax'
    exchange = sys.argv[1] if len(sys.argv) > 1 else 'gateio'
    symbol = sys.argv[2] if len(sys.argv) > 2 else 'ETH/USDT'

    hist_start_date = datetime.utcnow() - timedelta(minutes=10)
    print('UTC NOW: ', datetime.utcnow())
    print('hist_start_data: ', hist_start_date)
    print('Using symbol: ', symbol)

    # Create data feeds
    data_1m = bt.feeds.CCXT(exchange=exchange, symbol=symbol, name="1m",
                               timeframe=bt.TimeFrame.Minutes, #fromdate=hist_start_date,
                               compression=1)
    cerebro.adddata(data_1m)

    cerebro.replaydata(data_1m, timeframe=bt.TimeFrame.Minutes, name="1m", compression = 5)
    
    
    cerebro.addstrategy(TestStrategy)
    cerebro.run()

    Output:

    UTC NOW:  2019-06-24 02:30:45.980828
hist_start_data:  2019-06-24 02:20:45.980597
Using symbol:  ETH/USDT
START

...
prenext len 163 - counter 163
2019-06-23 12:33:00, data#0: 737233.5229166667
2019-06-23 12:33:00, data#1: 737233.5229166667
dts[]:  [737233.5236111111, 737233.5236111111]
prenext len 164 - counter 164
2019-06-23 12:34:00, data#0: 737233.5236111111
2019-06-23 12:34:00, data#1: 737233.5236111111
dts[]:  [737233.5243055555, 737233.5243055555]
prenext len 165 - counter 165
2019-06-23 12:35:00, data#0: 737233.5243055555
2019-06-23 12:35:00, data#1: 737233.5243055555
dts[]:  [737233.525, 737233.525]
2019-06-23 12:36:00, Counter: 166 Open/Close/High/Low/Volume: 312.57 - 312.45 - 312.71 - 312.45 - 99.16966564 Len: 166
2019-06-23 12:36:00, MACD#1: MACD: 0.07, Histo: -0.12
2019-06-23 12:36:00, MACD#2: MACD: 1.19, Histo: -0.09
dts[]:  [737233.5256944444, 737233.5256944444]
2019-06-23 12:37:00, Counter: 167 Open/Close/High/Low/Volume: 312.45 - 312.54 - 312.54 - 312.36 - 21.3511 Len: 167
2019-06-23 12:37:00, MACD#1: MACD: 0.04, Histo: -0.12
2019-06-23 12:37:00, MACD#2: MACD: 1.19, Histo: -0.08
dts[]:  [737233.526388889, 737233.526388889]
2019-06-23 12:38:00, Counter: 168 Open/Close/High/Low/Volume: 312.45 - 312.2 - 312.45 - 312.2 - 18.69802458 Len: 168
2019-06-23 12:38:00, MACD#1: MACD: -0.01, Histo: -0.13
2019-06-23 12:38:00, MACD#2: MACD: 1.17, Histo: -0.10
dts[]:  [737233.5270833333, 737233.5270833333]
2019-06-23 12:39:00, Counter: 169 Open/Close/High/Low/Volume: 312.34 - 312.14 - 312.34 - 311.43 - 122.3391867563 Len: 169
2019-06-23 12:39:00, MACD#1: MACD: -0.05, Histo: -0.14
2019-06-23 12:39:00, MACD#2: MACD: 1.16, Histo: -0.11
dts[]:  [737233.5277777778, 737233.5277777778]
2019-06-23 12:40:00, Counter: 170 Open/Close/High/Low/Volume: 311.44 - 311.79 - 311.79 - 311.43 - 22.0295 Len: 170
2019-06-23 12:40:00, MACD#1: MACD: -0.11, Histo: -0.16
2019-06-23 12:40:00, MACD#2: MACD: 1.13, Histo: -0.13
dts[]:  [737233.5284722223, 737233.5284722223]
...

    You see the UTC NOW? I don't know why the MACDs' date is at around 2019-06-23 12:40:00.
    And I'm confused that:

    1. using fromdate will case error
    2. without fromdate, the script is still getting old data, but without error
    3. And I don't know why it's getting old data from that time

    How can these two happen in the same script?

    I'm just lost.

    0
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