Add python code sample for Submit and Verify

Submit a transaction and verify its validity on the ledger using xrpl-py

content/_code-samples/submit-and-verify/py/submit-and-verify.py

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+from xrpl.clients import JsonRpcClient
+from xrpl.models.transactions import AccountSet
+from xrpl.transaction import safe_sign_and_submit_transaction
+from xrpl.core import keypairs
+from xrpl.wallet import Wallet
+
+myAddr = "rfaNymVS1fEREj4FpNroXVEcVVMph6k2Mt"
+mySeed = "ss3GZzmyEBxvwB3LUv-----------"
+
+# Derive and initialize wallet
+public, private = keypairs.derive_keypair(mySeed)
+wallet_from_seed = Wallet(mySeed, 0)
+
+# Connect to a testnet node
+JSON_RPC_URL = "https://s.altnet.rippletest.net:51234/"
+client = JsonRpcClient(JSON_RPC_URL)
+
+# Construct AccountSet transaction
+tx = AccountSet(
+    account=myAddr,
+    fee="10",
+    set_flag=1  # Numerical Value: 1 = asfRequireDest
+)
+
+# Sign the transaction locally & submit transaction and verify its validity on the ledger
+my_tx_payment_signed = safe_sign_and_submit_transaction(transaction=tx, wallet=wallet_from_seed, client=client)
+
+if my_tx_payment_signed.is_successful():
+    print("Transaction successful!")
+else:
+    print("Transaction failed")