diff --git a/.gitignore b/.gitignore
index 1302f6cb..b9a86fc3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .DS_Store
 .python-version
+__pycache__
 *.pyc
 *.easm
 *.asm
diff --git a/mythril.py b/mythril.py
index ec702bb9..851000b6 100755
--- a/mythril.py
+++ b/mythril.py
@@ -19,12 +19,12 @@ def exitWithError(message):
 parser = argparse.ArgumentParser(description='Ethereum VM bytecode assembler/ disassembler')
 
 parser.add_argument('-d', '--disassemble',  action='store_true', help='disassemble, use with -c or -t')
-parser.add_argument('-a', '--assemble', nargs=1, help='produce bytecode from easm input file', metavar='INPUT FILE')
-parser.add_argument('-c', '--code', nargs=1, help='bytecode string ("6060604052...")', metavar='BYTECODE')
+parser.add_argument('-a', '--assemble', help='produce bytecode from easm input file', metavar='INPUT FILE')
+parser.add_argument('-c', '--code', help='bytecode string ("6060604052...")', metavar='BYTECODE')
 parser.add_argument('-t', '--transaction_hash', help='id of contract creation transaction')
 parser.add_argument('-o', '--outfile')
-parser.add_argument('--rpchost', nargs=1, default='127.0.0.1', help='RPC host')
-parser.add_argument('--rpcport', nargs=1, default=8545, help='RPC port')
+parser.add_argument('--rpchost', default='127.0.0.1', help='RPC host')
+parser.add_argument('--rpcport', type=int, default=[8545], help='RPC port')
 
 args = parser.parse_args()
 
@@ -32,13 +32,16 @@ args = parser.parse_args()
 if (args.disassemble):
 
     if (args.code):
-        encoded_bytecode = args.code[0]
+        encoded_bytecode = args.code
     elif (args.transaction_hash):
 
         try:
-            encoded_bytecode = util.bytecode_from_blockchain(args.transaction_hash, args.rpchost[0], args.rpcport[0])
+
+            encoded_bytecode = util.bytecode_from_blockchain(args.transaction_hash, args.rpchost, args.rpcport)
+
+            print(encoded_bytecode)
         except Exception as e:
-            exitWithError("Exception loading bytecode via RPC: " + str(e.message))
+            exitWithError("Exception loading bytecode via RPC" + str(e.message))
 
     else:
         exitWithError("Disassembler: Pass either the -c or -t flag to specify the input bytecode")
@@ -54,7 +57,7 @@ if (args.disassemble):
 
 elif (args.assemble):
 
-    easm = util.file_to_string(args.assemble[0])
+    easm = util.file_to_string(args.assemble)
 
     disassembly = asm.easm_to_disassembly(easm)
 
diff --git a/test.easm b/test.easm
deleted file mode 100644
index cfae8b47..00000000
--- a/test.easm
+++ /dev/null
@@ -1,60 +0,0 @@
-PUSH1 0x60
-PUSH1 0x40
-MSTORE
-CALLDATASIZE
-ISZERO
-PUSH1 0x0a
-JUMPI
-JUMPDEST
-PUSH1 0x5a
-PUSH1 0x00
-DUP1
-SLOAD
-PUSH1 0xff
-AND
-ISZERO
-ISZERO
-EQ
-DUP1
-PUSH1 0x20
-JUMPI
-POP
-CALLVALUE
-PUSH1 0x00
-EQ
-JUMPDEST
-DUP1
-PUSH1 0x52
-JUMPI
-POP
-PUSH1 0x01
-SLOAD
-PUSH20 0xffffffffffffffffffffffffffffffffffffffff
-AND
-PUSH1 0x00
-CALLVALUE
-PUSH1 0x60
-DUP3
-DUP2
-DUP2
-DUP2
-DUP6
-DUP9
-DUP4
-CALL
-SWAP4
-POP
-POP
-POP
-POP
-ISZERO
-JUMPDEST
-ISZERO
-PUSH1 0x5c
-JUMPI
-PUSH1 0x02
-JUMP
-JUMPDEST
-STOP
-JUMPDEST
-JUMP
diff --git a/util.py b/util.py
index 8d1fc679..4e63c199 100644
--- a/util.py
+++ b/util.py
@@ -13,7 +13,7 @@ def bytecode_from_blockchain(creation_tx_hash, rpc_host='127.0.0.1', rpc_port=85
     creation_tx_hash = ID of transaction that created the contract.
     """
 
-    eth = EthJsonRpcWithDebug(rpc_host, rpc_port)
+    eth = EthJsonRpcWithDebug(rpc_host, 8545)
 
     trace = eth.traceTransaction(creation_tx_hash)