Don't use static methods. Use name by_code instead of bycode.

src/pricehist/cli.py

@@ -66,7 +66,7 @@ def cmd_source(args):
         if output != "":
             print(output)
 
-    source = sources.by_id[args.identifier]()
+    source = sources.by_id[args.identifier]
 
     if args.symbols:
         print("\n".join(source.symbols()))
@@ -84,8 +84,8 @@ def cmd_source(args):
 
 
 def cmd_fetch(args):
-    source = sources.by_id[args.source]()
-    output = outputs.by_type[args.output]()
+    source = sources.by_id[args.source]
+    output = outputs.by_type[args.output]
     start = args.start or source.start()
     type = args.type or (source.types() + ["unknown"])[0]
 

src/pricehist/isocurrencies.py

@@ -18,7 +18,7 @@ Functions:
 
     current_data_date() -> str
     historical_data_date() -> str
-    bycode() -> dict[str, ISOCurrency]
+    by_code() -> dict[str, ISOCurrency]
 
 """
 
@@ -50,7 +50,7 @@ def historical_data_date():
     return three.cssselect("ISO_4217")[0].attrib["Pblshd"]
 
 
-def bycode():
+def by_code():
     result = {}
 
     one = etree.fromstring(read_binary("pricehist.resources", "list_one.xml"))

src/pricehist/outputs/__init__.py

@@ -6,8 +6,8 @@ from .ledger import Ledger
 default = "ledger"
 
 by_type = {
-    "beancount": Beancount,
-    "csv": CSV,
-    "gnucash-sql": GnuCashSQL,
-    "ledger": Ledger,
+    "beancount": Beancount(),
+    "csv": CSV(),
+    "gnucash-sql": GnuCashSQL(),
+    "ledger": Ledger(),
 }

src/pricehist/sources/__init__.py

@@ -2,4 +2,4 @@ from .coindesk import CoinDesk
 from .coinmarketcap import CoinMarketCap
 from .ecb import ECB
 
-by_id = {CoinDesk.id(): CoinDesk, CoinMarketCap.id(): CoinMarketCap, ECB.id(): ECB}
+by_id = {source.id(): source for source in [CoinDesk(), CoinMarketCap(), ECB()]}

src/pricehist/sources/coindesk.py

@@ -7,35 +7,28 @@ from pricehist.price import Price
 
 
 class CoinDesk:
-    @staticmethod
-    def id():
+    def id(self):
         return "coindesk"
 
-    @staticmethod
-    def name():
+    def name(self):
         return "CoinDesk Bitcoin Price Index"
 
-    @staticmethod
-    def description():
+    def description(self):
         return (
             "An average of bitcoin prices across leading global exchanges. \n"
             "Powered by CoinDesk, https://www.coindesk.com/price/bitcoin"
         )
 
-    @staticmethod
-    def source_url():
+    def source_url(self):
         return "https://www.coindesk.com/coindesk-api"
 
-    @staticmethod
-    def start():
+    def start(self):
         return "2010-07-17"
 
-    @staticmethod
-    def types():
+    def types(self):
         return ["close"]
 
-    @staticmethod
-    def notes():
+    def notes(self):
         return ""
 
     def symbols(self):

src/pricehist/sources/ecb.py

@@ -9,32 +9,25 @@ from pricehist.price import Price
 
 
 class ECB:
-    @staticmethod
-    def id():
+    def id(self):
         return "ecb"
 
-    @staticmethod
-    def name():
+    def name(self):
         return "European Central Bank"
 
-    @staticmethod
-    def description():
+    def description(self):
         return "European Central Bank Euro foreign exchange reference rates"
 
-    @staticmethod
-    def source_url():
+    def source_url(self):
         return "https://www.ecb.europa.eu/stats/exchange/eurofxref/html/index.en.html"
 
-    @staticmethod
-    def start():
+    def start(self):
         return "1999-01-04"
 
-    @staticmethod
-    def types():
+    def types(self):
         return ["reference"]
 
-    @staticmethod
-    def notes():
+    def notes(self):
         return ""
 
     def symbols(self):
@@ -42,7 +35,7 @@ class ECB:
         root = etree.fromstring(data)
         nodes = root.cssselect("[currency]")
         currencies = sorted(set([n.attrib["currency"] for n in nodes]))
-        iso = isocurrencies.bycode()
+        iso = isocurrencies.by_code()
         pairs = [f"EUR/{c}    Euro against {iso[c].name}" for c in currencies]
         return pairs