Minor changes.

bin/vyper-run

@@ -41,7 +41,7 @@ def get_tester(code):
         EthereumTester,
     )
     tester = EthereumTester(backend=PyEVMDebugBackend())
-    import ipdb; ipdb.set_trace()
+
     def zero_gas_price_strategy(web3, transaction_params=None):
         return 0  # zero gas price makes testing simpler.
 

vdb/debug_computation.py

@@ -23,10 +23,12 @@ class DebugComputation(ByzantiumComputation):
 
     @classmethod
     def apply_computation(cls, state, message, transaction_context):
-        print('hello!!!!!!')
-        import ipdb; ipdb.set_trace()
+
         with cls(state, message, transaction_context) as computation:
 
+            print('hello!!!!!!')
+            import ipdb; ipdb.set_trace()
+
             # Early exit on pre-compiles
             if message.code_address in computation.precompiles:
                 computation.precompiles[message.code_address](computation)

vdb/eth_tester_debug_backend.py

@@ -45,5 +45,8 @@ def _setup_tester_chain():
 
 class PyEVMDebugBackend(PyEVMBackend):
 
+    def __init__(self):
+        super().__init__()
+
     def reset_to_genesis(self):
         self.account_keys, self.chain = _setup_tester_chain()