Refactor Python withdraw example for clarity (#191)

Author: samtin0x

v4-client-py-v2/examples/transfer_example_withdraw_other.py

@@ -13,22 +13,21 @@ async def test():
 
     wallet = await Wallet.from_mnemonic(node, DYDX_TEST_MNEMONIC, TEST_ADDRESS)
 
-    message = partial(withdraw, subaccount(TEST_ADDRESS, 0), TEST_ADDRESS, 0)
+    withdraw_tx = partial(withdraw, subaccount(TEST_ADDRESS, 0), TEST_ADDRESS, 0)
     amount = 100_000_000
 
-    simulated = node.builder.build(wallet, message(amount))
-
-    simulation = await node.simulate(simulated)
+    simulated_txs = node.builder.build(wallet, withdraw_tx(amount))
+    simulation = await node.simulate(simulated_txs)
     print("**Simulate**")
     print(simulation)
 
     fee = node.calculate_fee(simulation.gas_info.gas_used)
     print("**Total Fee**")
     print(fee)
 
-    response = await node.broadcast(
-        node.build(wallet, message(amount - fee.amount[0].amount), fee)
-    )
+    final_withdraw_tx = withdraw_tx(amount - fee.amount[0].amount)
+    final_txs = node.build(wallet, final_withdraw_tx, fee)
+    response = await node.broadcast(final_txs)
     print("**Withdraw and Send**")
     print(response)