feat: Add format_pct helper method

freqtrade/util/__init__.py

@@ -18,6 +18,7 @@ from freqtrade.util.formatters import (
     fmt_coin,
     fmt_coin2,
     format_duration,
+    format_pct,
     round_value,
 )
 from freqtrade.util.ft_precise import FtPrecise
@@ -44,6 +45,7 @@ __all__ = [
     "format_date",
     "format_ms_time",
     "format_ms_time_det",
+    "format_pct",
     "get_dry_run_wallet",
     "FtPrecise",
     "PeriodicCache",

freqtrade/util/formatters.py

@@ -1,5 +1,7 @@
 from datetime import timedelta
 
+from numpy import isnan
+
 from freqtrade.constants import DECIMAL_PER_COIN_FALLBACK, DECIMALS_PER_COIN
 
 
@@ -80,3 +82,15 @@ def format_duration(td: timedelta) -> str:
     h, r = divmod(td.seconds, 3600)
     m, _ = divmod(r, 60)
     return f"{d}d {h:02d}:{m:02d}"
+
+
+def format_pct(value: float | None) -> str:
+    """
+    Format a float value as percentage string with 2 decimals
+    None and NaN values are formatted as "N/A"
+    :param value: Float value to format
+    :return: Formatted percentage string
+    """
+    if value is None or isnan(value):
+        return "N/A"
+    return f"{value:.2%}"