add --limit-max-trades

freqtrade/misc.py

@@ -150,6 +150,12 @@ def build_subcommands(parser: argparse.ArgumentParser) -> None:
         type=int,
         metavar='INT',
     )
+    backtest.add_argument(
+        '--limit-max-trades',
+        help='uses max_open_trades from config to simulate real world limitations',
+        action='store_true',
+        dest='limit_max_trades',
+    )
 
 
 def start_backtesting(args) -> None:
@@ -165,6 +171,7 @@ def start_backtesting(args) -> None:
         'BACKTEST_LIVE': 'true' if args.live else '',
         'BACKTEST_CONFIG': args.config,
         'BACKTEST_TICKER_INTERVAL': str(args.ticker_interval),
+        'BACKTEST_LIMIT_MAX_TRADES': 'true' if args.limit_max_trades else '',
     })
     path = os.path.join(os.path.dirname(__file__), 'tests', 'test_backtesting.py')
     pytest.main(['-s', path])

freqtrade/tests/test_backtesting.py

@@ -83,31 +83,43 @@ def generate_text_table(data: Dict[str, Dict], results: DataFrame, stake_currenc
     return tabulate(tabular_data, headers=headers)
 
 
-def backtest(backtest_conf, processed, mocker):
+def backtest(config: Dict, processed, mocker, max_open_trades=0):
+    """
+    Implements backtesting functionality
+    :param config: config to use
+    :param processed: a processed dictionary with format {pair, data}
+    :param mocker: mocker instance
+    :param max_open_trades: maximum number of concurrent trades (default: 0, disabled)
+    :return: DataFrame
+    """
     trades = []
     trade_count_lock = {}
     exchange._API = Bittrex({'key': '', 'secret': ''})
-    mocker.patch.dict('freqtrade.main._CONF', backtest_conf)
+    mocker.patch.dict('freqtrade.main._CONF', config)
     for pair, pair_data in processed.items():
         pair_data['buy'], pair_data['sell'] = 0, 0
         ticker = populate_sell_trend(populate_buy_trend(pair_data))
         # for each buy point
         for row in ticker[ticker.buy == 1].itertuples(index=True):
+            if max_open_trades > 0:
                 # Check if max_open_trades has already been reached for the given date
-            if not trade_count_lock.get(row.date, 0) < backtest_conf['max_open_trades']:
+                if not trade_count_lock.get(row.date, 0) < max_open_trades:
                     continue
 
+            if max_open_trades > 0:
                 # Increase lock
                 trade_count_lock[row.date] = trade_count_lock.get(row.date, 0) + 1
+
             trade = Trade(
                 open_rate=row.close,
                 open_date=row.date,
-                amount=backtest_conf['stake_amount'],
+                amount=config['stake_amount'],
                 fee=exchange.get_fee() * 2
             )
 
             # calculate win/lose forwards from buy point
             for row2 in ticker[row.Index + 1:].itertuples(index=True):
+                if max_open_trades > 0:
                     # Increase trade_count_lock for every iteration
                     trade_count_lock[row2.date] = trade_count_lock.get(row2.date, 0) + 1
 
@@ -120,6 +132,13 @@ def backtest(backtest_conf, processed, mocker):
     return DataFrame.from_records(trades, columns=labels)
 
 
+def get_max_open_trades(config):
+    if not os.environ.get('BACKTEST_LIMIT_MAX_TRADES'):
+        return 0
+    print('Using max_open_trades: {} ...'.format(config['max_open_trades']))
+    return config['max_open_trades']
+
+
 @pytest.mark.skipif(not os.environ.get('BACKTEST'), reason="BACKTEST not set")
 def test_backtest(backtest_conf, mocker):
     print('')
@@ -150,8 +169,6 @@ def test_backtest(backtest_conf, mocker):
         config['stake_currency'], config['stake_amount']
     ))
 
-    print('Using max_open_trades: {} ...'.format(config['max_open_trades']))
-
     # Print timeframe
     min_date, max_date = get_timeframe(data)
     print('Measuring data from {} up to {} ...'.format(
@@ -159,8 +176,6 @@ def test_backtest(backtest_conf, mocker):
     ))
 
     # Execute backtest and print results
-    results = backtest(config, preprocess(data), mocker)
-    print('====================== BACKTESTING REPORT ======================================\n\n'
-          'NOTE: This Report doesn\'t respect the limits of max_open_trades, \n'
-          '      so the projected values should be taken with a grain of salt.\n')
+    results = backtest(config, preprocess(data), mocker, get_max_open_trades(config))
+    print('====================== BACKTESTING REPORT ======================================\n\n')
     print(generate_text_table(data, results, config['stake_currency']))

freqtrade/tests/test_misc.py

@@ -109,6 +109,7 @@ def test_start_backtesting(mocker):
         live=True,
         loglevel=20,
         ticker_interval=1,
+        limit_max_trades=True,
     )
     start_backtesting(args)
     assert env_mock == {
@@ -116,6 +117,7 @@ def test_start_backtesting(mocker):
         'BACKTEST_LIVE': 'true',
         'BACKTEST_CONFIG': 'config.json',
         'BACKTEST_TICKER_INTERVAL': '1',
+        'BACKTEST_LIMIT_MAX_TRADES': 'true',
     }
     assert pytest_mock.call_count == 1