feat: add __repr__ method to CustomFee base class for better debugging

CHANGELOG.md

@@ -57,6 +57,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 
 ### Added
 
+- Add `__repr__` method to CustomFee base class for better debugging by displaying fee_collector_account_id and all_collectors_are_exempt.
 - Add comprehensive Google-style docstrings to examples/account_create.py
 - add revenue generating topic tests/example
 - add fee_schedule_key, fee_exempt_keys, custom_fees fields in TopicCreateTransaction, TopicUpdateTransaction, TopicInfo classes

src/hiero_sdk_python/tokens/custom_fee.py

@@ -62,4 +62,18 @@ def _validate_checksums(self, client: Client) -> None:
             self.fee_collector_account_id.validate_checksum(client)
 
     def __eq__(self, other: "CustomFee") -> bool:
-        return self.fee_collector_account_id == other.fee_collector_account_id and self.all_collectors_are_exempt == other.all_collectors_are_exempt
+        return self.fee_collector_account_id == other.fee_collector_account_id and self.all_collectors_are_exempt == other.all_collectors_are_exempt
+
+    def __repr__(self) -> str:
+        """Return a string representation of the CustomFee instance.
+
+        Returns:
+            str: A string containing the class name, fee_collector_account_id,
+                and all_collectors_are_exempt.
+        """
+        return (
+            f"{self.__class__.__name__}("
+            f"fee_collector_account_id={self.fee_collector_account_id}, "
+            f"all_collectors_are_exempt={self.all_collectors_are_exempt}"
+            f")"
+        )

tests/unit/test_custom_fee.py

@@ -72,4 +72,20 @@ def test_custom_royalty_fee():
     assert new_fee.all_collectors_are_exempt is True
     assert isinstance(new_fee.fallback_fee, CustomFixedFee)
     assert new_fee.fallback_fee.amount == 50
-    assert new_fee.fallback_fee.denominating_token_id == TokenId(0, 0, 789)
+    assert new_fee.fallback_fee.denominating_token_id == TokenId(0, 0, 789)
+
+
+def test_custom_fee_repr():
+    """Test the __repr__ method of CustomFee base class"""
+    fee = CustomFixedFee(
+        amount=100,
+        denominating_token_id=TokenId(0, 0, 123),
+        fee_collector_account_id=AccountId(0, 0, 456),
+        all_collectors_are_exempt=True,
+    )
+
+    repr_str = repr(fee)
+
+    assert "CustomFixedFee" in repr_str
+    assert "fee_collector_account_id=0.0.456" in repr_str
+    assert "all_collectors_are_exempt=True" in repr_str