Avoid modifying self.transactions in prepare_for_verifier
In python3, the `.keys()` function returns an iterator, not a list, so to get a list that can be iterated over, use `list()` instead to avoid modification of a list while in use.
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@ -969,7 +969,7 @@ class Abstract_Wallet(PrintError):
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# if we are on a pruning server, remove unverified transactions
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with self.lock:
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vr = list(self.verified_tx.keys()) + list(self.unverified_tx.keys())
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for tx_hash in self.transactions.keys():
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for tx_hash in list(self.transactions):
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if tx_hash not in vr:
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self.print_error("removing transaction", tx_hash)
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self.transactions.pop(tx_hash)
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