util: small clean-up for format_satoshis

electrum/util.py

@@ -582,7 +582,7 @@ def chunks(items, size: int):
         yield items[i: i + size]
 
 
-def format_satoshis_plain(x, decimal_point = 8) -> str:
+def format_satoshis_plain(x, *, decimal_point=8) -> str:
     """Display a satoshi amount scaled.  Always uses a '.' as a decimal
     point and has no thousands separator"""
     if x == '!':
@@ -594,7 +594,15 @@ def format_satoshis_plain(x, decimal_point = 8) -> str:
 DECIMAL_POINT = localeconv()['decimal_point']  # type: str
 
 
-def format_satoshis(x, num_zeros=0, decimal_point=8, precision=None, is_diff=False, whitespaces=False) -> str:
+def format_satoshis(
+        x,  # in satoshis
+        *,
+        num_zeros=0,
+        decimal_point=8,
+        precision=None,
+        is_diff=False,
+        whitespaces=False,
+) -> str:
     if x is None:
         return 'unknown'
     if x == '!':