fix ruff

lnbits/core/views/blockexplorer_api.py

@@ -40,7 +40,7 @@ async def api_tip() -> BlockHeader:
         async with _client() as c:
             return await c.get_tip()
     except ElectrumError as e:
-        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e))
+        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e)) from e
 
 
 @blockexplorer_router.get("/fees")
@@ -57,12 +57,12 @@ async def api_fees() -> FeeResponse:
             histogram = await c.fee_histogram()
         estimates = {
             str(blocks): fee
-            for blocks, fee in zip([1, 3, 6, 144], estimates_raw)
+            for blocks, fee in zip([1, 3, 6, 144], estimates_raw, strict=False)
             if fee >= 0
         }
         return FeeResponse(estimates=estimates, histogram=histogram)
     except ElectrumError as e:
-        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e))
+        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e)) from e
 
 
 @blockexplorer_router.get("/tx/{txid}")
@@ -73,7 +73,7 @@ async def api_tx(txid: str) -> Transaction:
             raw_hex = await c.get_transaction(txid, verbose=False)
         return parse_raw_tx(raw_hex)
     except ElectrumError as e:
-        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e))
+        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e)) from e
 
 
 @blockexplorer_router.get("/address/{address}")
@@ -82,7 +82,7 @@ async def api_address(address: str) -> AddressResponse:
     try:
         scripthash = scripthash_from_address(address)
     except ValueError as e:
-        raise HTTPException(HTTPStatus.BAD_REQUEST, detail=str(e))
+        raise HTTPException(HTTPStatus.BAD_REQUEST, detail=str(e)) from e
     try:
         async with _client() as c:
             balance, history = await asyncio.gather(
@@ -91,4 +91,4 @@ async def api_address(address: str) -> AddressResponse:
             )
         return AddressResponse(balance=balance, history=history)
     except ElectrumError as e:
-        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e))
+        raise HTTPException(HTTPStatus.SERVICE_UNAVAILABLE, detail=str(e)) from e

lnbits/utils/electrum.py

@@ -52,7 +52,7 @@ def _b58decode_check(s: str) -> bytes:
 
 
 def address_to_scriptpubkey(address: str) -> bytes:
-    """Convert a Bitcoin address (P2PKH/P2SH/P2WPKH/P2WSH/P2TR) to scriptPubKey bytes."""
+    """Convert a Bitcoin address (P2PKH/P2SH/P2WPKH/P2WSH/P2TR) to scriptPubKey."""
     lower = address.lower()
     if lower.startswith(("bc1", "tb1", "bcrt1")):
         _, data = bech32_decode(address)
@@ -291,7 +291,6 @@ def parse_raw_tx(hex_str: str) -> Transaction:
                 )
             )
 
-    vout_start = i
     vout_count, i = _read_varint(data, i)
     vout: list[TxOutput] = []
     for n_out in range(vout_count):