stable/freqtrade/plugins/pairlist/pairlist_helpers.py
2020-12-30 12:30:50 +01:00

24 lines
988 B
Python

import re
from typing import List
def expand_pairlist(wildcardpl: List[str], available_pairs: List[str]) -> List[str]:
"""
Expand pairlist potentially containing wildcards based on available markets.
This will implicitly filter all pairs in the wildcard-list which are not in available_pairs.
:param wildcardpl: List of Pairlists, which may contain regex
:param available_pairs: List of all available pairs (`exchange.get_markets().keys()`)
:return expanded pairlist, with Regexes from wildcardpl applied to match all available pairs.
:raises: ValueError if a wildcard is invalid (like '*/BTC' - which should be `.*/BTC`)
"""
result = []
for pair_wc in wildcardpl:
try:
comp = re.compile(pair_wc)
result += [
pair for pair in available_pairs if re.match(comp, pair)
]
except re.error as err:
raise ValueError(f"Wildcard error in {pair_wc}, {err}")
return result