Update list_exchanges to use a dict internally

freqtrade/commands/list_commands.py

@@ -28,15 +28,20 @@ def start_list_exchanges(args: Dict[str, Any]) -> None:
     exchanges = validate_exchanges(args['list_exchanges_all'])
 
     if args['print_one_column']:
-        print('\n'.join([e[0] for e in exchanges]))
+        print('\n'.join([e['name'] for e in exchanges]))
     else:
         if args['list_exchanges_all']:
             print("All exchanges supported by the ccxt library:")
         else:
             print("Exchanges available for Freqtrade:")
-            exchanges = [e for e in exchanges if e[1] is not False]
+            exchanges = [e for e in exchanges if e['valid'] is not False]
 
-        print(tabulate(exchanges, headers=['Exchange name', 'Valid', 'reason']))
+        headers = {
+            'name': 'Exchange name',
+            'valid': 'Valid',
+            'comment': 'reason',
+        }
+        print(tabulate(exchanges, headers=headers))
 
 
 def _print_objs_tabular(objs: List, print_colorized: bool) -> None:

freqtrade/exchange/exchange_utils.py

@@ -10,6 +10,7 @@ from ccxt import (DECIMAL_PLACES, ROUND, ROUND_DOWN, ROUND_UP, SIGNIFICANT_DIGIT
                   TRUNCATE, decimal_to_precision)
 
 from freqtrade.exchange.common import BAD_EXCHANGES, EXCHANGE_HAS_OPTIONAL, EXCHANGE_HAS_REQUIRED
+from freqtrade.exchange.types import ValidExchangesType
 from freqtrade.util import FtPrecise
 from freqtrade.util.datetime_helpers import dt_from_ts, dt_ts
 
@@ -55,14 +56,17 @@ def validate_exchange(exchange: str) -> Tuple[bool, str]:
     return True, ''
 
 
-def validate_exchanges(all_exchanges: bool) -> List[Tuple[str, bool, str]]:
+def validate_exchanges(all_exchanges: bool) -> List[ValidExchangesType]:
     """
     :return: List of tuples with exchangename, valid, reason.
     """
     exchanges = ccxt_exchanges() if all_exchanges else available_exchanges()
-    exchanges_valid = [
-        (e, *validate_exchange(e)) for e in exchanges
+
+    exchanges_valid: List[ValidExchangesType] = [
+        {'name': e, 'valid': valid, 'comment': comment}
+        for e, valid, comment in ((e, *validate_exchange(e)) for e in exchanges)
     ]
+
     return exchanges_valid
 
 

freqtrade/exchange/types.py

@@ -26,5 +26,13 @@ class OrderBook(TypedDict):
 
 Tickers = Dict[str, Ticker]
 
+
+# Used for list-exchanges
+class ValidExchangesType(TypedDict):
+    name: str
+    valid: bool
+    comment: str
+
+
 # pair, timeframe, candleType, OHLCV, drop last?,
 OHLCVResponse = Tuple[str, str, CandleType, List, bool]