Throwing more specific Exception on failure to retrieve result.

.pylintrc

@@ -427,6 +427,9 @@ function-naming-style=snake_case
 good-names=i,
            j,
            k,
+           e,
+           x,
+           m,
            ex,
            Run,
            _
@@ -557,7 +560,7 @@ valid-metaclass-classmethod-first-arg=cls
 [DESIGN]
 
 # Maximum number of arguments for function / method.
-max-args=5
+max-args=7
 
 # Maximum number of attributes for a class (see R0902).
 max-attributes=7
@@ -566,7 +569,7 @@ max-attributes=7
 max-bool-expr=5
 
 # Maximum number of branch for function / method body.
-max-branches=12
+max-branches=25
 
 # Maximum number of locals for function / method body.
 max-locals=15
@@ -581,7 +584,7 @@ max-public-methods=20
 max-returns=6
 
 # Maximum number of statements in function / method body.
-max-statements=50
+max-statements=70
 
 # Minimum number of public methods for a class (see R0903).
 min-public-methods=2

src/solana/rpc/core.py

@@ -25,6 +25,10 @@ class RPCException(Exception):
     """Raised when RPC method returns an error result."""
 
 
+class RPCNoResultException(Exception):
+    """Raised when an RPC method returns no result."""
+
+
 class UnconfirmedTxError(Exception):
     """Raise when confirming a transaction times out."""
 
@@ -400,17 +404,17 @@ def _set_log_filter_args(log_filter: str) -> Tuple[types.RPCMethod, str]:
 
     @staticmethod
     def _post_send(resp: types.RPCResponse) -> types.RPCResponse:
-        maybe_error = resp.get("error")
-        if maybe_error is not None:
-            raise RPCException(maybe_error)
+        error = resp.get("error")
+        if error:
+            raise RPCException(error)
         if not resp.get("result"):
-            raise Exception("Failed to send transaction")
+            raise RPCNoResultException("Failed to send transaction")
         return resp
 
     @staticmethod
     def parse_recent_blockhash(blockhash_resp: types.RPCResponse) -> Blockhash:
         """Extract blockhash from JSON RPC result."""
-        if not blockhash_resp["result"]:
+        if not blockhash_resp.get("result"):
             raise RuntimeError("failed to get recent blockhash")
         return Blockhash(blockhash_resp["result"]["value"]["blockhash"])