Fix string interpolation issues in exception message.

Fixes an issue preventing a meaningful message from being extracted from the result data due to the HexBytes object being printed rather than the bytes which includes the message.
ethereum · Aug 6, 2021 · d1d98f9 · d1d98f9
1 parent d722f31
commit d1d98f9
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diff --git a/newsfragments/2096.bugfix.rst b/newsfragments/2096.bugfix.rst
@@ -0,0 +1 @@
+Hot fix for string interpolation issue with contract function call decoding exception to facilitate extracting a meaningful message from the eth_call response
diff --git a/web3/contract.py b/web3/contract.py
@@ -1524,8 +1524,8 @@ def call_contract_function(
             )
         else:
             msg = (
-                f"Could not decode contract function call {function_identifier} "
-                f"return data {return_data!r} for output_types {output_types}"
+                f"Could not decode contract function call to {function_identifier} with "
+                f"return data: {str(return_data)}, output_types: {output_types}"
             )
         raise BadFunctionCallOutput(msg) from e