add round_value incl. tests

freqtrade/misc.py

@@ -27,6 +27,20 @@ def decimals_per_coin(coin: str):
     return DECIMALS_PER_COIN.get(coin, DECIMAL_PER_COIN_FALLBACK)
 
 
+def round_value(value: float, decimals: int, keep_trailing_zeros=False) -> str:
+    """
+    Round value to given decimals
+    :param value: Value to be rounded
+    :param decimals: Number of decimals to round to
+    :param keep_trailing_zeros: Keep trailing zeros "222.200" vs. "222.2"
+    :return: Rounded value as string
+    """
+    val = f"{value:.{decimals}f}"
+    if not keep_trailing_zeros:
+        val = val.rstrip('0').rstrip('.')
+    return val
+
+
 def round_coin_value(
         value: float, coin: str, show_coin_name=True, keep_trailing_zeros=False) -> str:
     """
@@ -38,8 +52,7 @@ def round_coin_value(
     :return: Formatted / rounded value (with or without coin name)
     """
     val = f"{value:.{decimals_per_coin(coin)}f}"
-    if not keep_trailing_zeros:
+    val = round_value(value, decimals_per_coin(coin), keep_trailing_zeros)
-        val = val.rstrip('0').rstrip('.')
     if show_coin_name:
         val = f"{val} {coin}"
 

tests/test_misc.py

@@ -9,8 +9,8 @@ import pytest
 
 from freqtrade.misc import (dataframe_to_json, decimals_per_coin, deep_merge_dicts, file_dump_json,
                             file_load_json, is_file_in_dir, json_to_dataframe, pair_to_filename,
-                            parse_db_uri_for_logging, plural, round_coin_value, safe_value_fallback,
+                            parse_db_uri_for_logging, plural, round_coin_value, round_value,
-                            safe_value_fallback2)
+                            safe_value_fallback, safe_value_fallback2)
 
 
 def test_decimals_per_coin():
@@ -37,6 +37,18 @@ def test_round_coin_value():
     assert round_coin_value(222.2, 'USDT', False, True) == '222.200'
 
 
+def test_round_value():
+
+    assert round_value(222.222222, 3) == '222.222'
+    assert round_value(222.2, 3) == '222.2'
+    assert round_value(222.00, 3) == '222'
+    assert round_value(222.12745, 3) == '222.127'
+    assert round_value(0.1274512123, 8) == '0.12745121'
+    assert round_value(0.1274512123, 5) == '0.12745'
+    assert round_value(222.2, 3, True) == '222.200'
+    assert round_value(222.2, 0, True) == '222'
+
+
 def test_file_dump_json(mocker) -> None:
     file_open = mocker.patch('freqtrade.misc.Path.open', MagicMock())
     json_dump = mocker.patch('rapidjson.dump', MagicMock())