implement and use the round_or_none() helper function

jesse/helpers.py

@@ -5,7 +5,7 @@
 import string
 import sys
 import uuid
-from typing import List, Tuple, Union, Any
+from typing import List, Tuple, Union, Any, Optional
 from pprint import pprint
 import arrow
 import click
@@ -595,6 +595,15 @@ def relative_to_absolute(path: str) -> str:
     return os.path.abspath(path)
 
 
+def round_or_none(x: Union[float, None], digits: int = 0) -> Optional[float]:
+    """
+    Rounds a number to a certain number of digits or returns None if the number is None
+    """
+    if x is None:
+        return None
+    return round(x, digits)
+
+
 def round_price_for_live_mode(price, precision: int) -> Union[float, np.ndarray]:
     """
     Rounds price(s) based on exchange requirements

jesse/services/report.py

@@ -34,7 +34,7 @@ def positions() -> list:
             'opened_at': p.opened_at,
             'qty': p.qty,
             'value': round(p.value, 2),
-            'entry': p.entry_price,
+            'entry': jh.round_or_none(p.entry_price, 2),
             'current_price': p.current_price,
             'liquidation_price': p.liquidation_price,
             'pnl': p.pnl,

tests/test_helpers.py

@@ -615,3 +615,9 @@ class TestClass:
 
     # if string is passed, it will return the string
     assert jh.get_class_name('TestClass') == 'TestClass'
+
+
+def test_round_or_none():
+    assert jh.round_or_none(1.23) == 1
+    assert jh.round_or_none(1.23456789, 2) == 1.23
+    assert jh.round_or_none(None) is None