52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
"""
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Shuffle pair list filter
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"""
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import logging
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import random
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from typing import Any, Dict, List
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from freqtrade.pairlist.IPairList import IPairList
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logger = logging.getLogger(__name__)
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class ShuffleFilter(IPairList):
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def __init__(self, exchange, pairlistmanager,
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config: Dict[str, Any], pairlistconfig: Dict[str, Any],
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pairlist_pos: int) -> None:
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super().__init__(exchange, pairlistmanager, config, pairlistconfig, pairlist_pos)
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self._seed = pairlistconfig.get('seed')
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self._random = random.Random(self._seed)
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@property
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def needstickers(self) -> bool:
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"""
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Boolean property defining if tickers are necessary.
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If no Pairlist requires tickers, an empty List is passed
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as tickers argument to filter_pairlist
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"""
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return False
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def short_desc(self) -> str:
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"""
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Short whitelist method description - used for startup-messages
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"""
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return (f"{self.name} - Shuffling pairs" +
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(f", seed = {self._seed}." if self._seed is not None else "."))
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def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
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"""
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Filters and sorts pairlist and returns the whitelist again.
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Called on each bot iteration - please use internal caching if necessary
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:param pairlist: pairlist to filter or sort
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:param tickers: Tickers (from exchange.get_tickers()). May be cached.
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:return: new whitelist
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"""
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# Shuffle is done inplace
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self._random.shuffle(pairlist)
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return pairlist
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