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Use stderr for “start block cannot be negative” error #256

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Use stderr for “start block cannot be negative” error #256

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4 changes: 3 additions & 1 deletion slot_change_stream.py
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Original file line number Diff line number Diff line change
Expand Up @@ -102,7 +102,9 @@ def stream(args):

# Start from either user-specified block or tip
current = args.start if args.start is not None else w3.eth.block_number
if current < 0: print("❌ start block cannot be negative."); sys.exit(2)
if current < 0:
print("❌ start block cannot be negative.", file=sys.stderr)
sys.exit(2)

while not stop_flag["stop"]:
if not w3.is_connected(): print("🔌 Reconnecting RPC…"); w3 = connect(args.rpc)
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