update the demo and execute function

examples/periodic_payment.py

@@ -1,6 +1,10 @@
 #!/usr/bin/env python3
 
 from pyteal import *
+import uuid, params, base64
+from algosdk import algod, transaction, account, mnemonic
+
+#-------------- using PyTeal program smart contract logic ----------------
 
 #template variables
 tmpl_fee = Int(1000)
@@ -27,6 +31,65 @@
                          Txn.first_valid() == tmpl_timeout,
                          Txn.amount() == Int(0))
 
-periodic_pay_escrow = periodic_pay_core.And(periodic_pay_transfer.Or(periodic_pay_close))
+periodic_pay_escrow = And(periodic_pay_core,
+                          Or(periodic_pay_transfer, periodic_pay_close))
+
+teal_source = periodic_pay_escrow.teal() 
+print("Teal Code:")
+print(teal_source)
+
+#--------- compile & send transaction using Goal and Python SDK ----------
+
+# compile teal
+teal_file = str(uuid.uuid4()) + ".teal"
+with open(teal_file, "w+") as f:
+    f.write(teal_source)
+lsig_fname = str(uuid.uuid4()) + ".tealc"
+
+stdout, stderr = execute(["goal", "clerk", "compile", "-o", lsig_fname,
+                          teal_file])
+
+if stderr != "":
+    print(stderr)
+    raise
+elif len(stdout) < 59:
+    print("error in compile teal")
+    raise
+
+with open(lsig_fname, "rb") as f:
+    teal_bytes = f.read()
+lsig = transaction.LogicSig(teal_bytes)
+
+# create algod clients
+acl = algod.AlgodClient(params.algod_token, params.algod_address)
+
+#Recover the account that is wanting to delegate signature
+passphrase = "patrol crawl rule faculty enemy sick reveal embody trumpet win shy zero ill draw swim excuse tongue under exact baby moral kite spring absent double"
+sk = mnemonic.to_private_key(passphrase)
+addr = account.address_from_private_key(sk)
+print( "Address of Sender/Delgator: " + addr )
+
+# sign the logic signature with an account sk
+lsig.sign(sk)
+
+# get suggested parameters
+params = acl.suggested_params()
+gen = params["genesisID"]
+gh = params["genesishashb64"]
+startRound = params.lastRound - (params.lastRound % 50)
+endRound = startRound + 1000
+fee = 0
+amount = 2000
+receiver = "ZZAF5ARA4MEC5PVDOP64JM5O5MQST63Q2KOY2FLYFLXXD3PFSNJJBYAFZM"
+
+# create a transaction
+txn = transaction.PaymentTxn(addr, fee, startRound, endRound, gh, receiver, amount)
+
+# Create the LogicSigTransaction with contract account LogicSig
+lstx = transaction.LogicSigTransaction(txn, lsig)
+
+# send raw LogicSigTransaction to network
+txid = acl.send_transaction(lstx)
+print("Transaction ID: " + txid)
+
 
-print(periodic_pay_escrow.teal())

pyteal/__init__.py

@@ -1 +1,2 @@
 from .ops import *
+from .util import execute

pyteal/util.py

@@ -4,7 +4,7 @@
 """
 
 from enum import Enum
-import re
+import re, subprocess
 
 
 class TealType(Enum):
@@ -103,13 +103,23 @@ def  valid_tmpl(s:str):
 
      if pattern.fullmatch(s) is None:
          raise TealInputError("{} is not a valid template variable".format(s))
-
 
 label_count = 0
 
-
 def new_label():
     global label_count
     new_l = "l{}".format(label_count)
     label_count += 1
     return new_l
+
+def execute(args):
+    """ Execute in bash, return stdout and stderr in string
+    
+    Arguments:
+    args: command and arguments to run, e.g. ['ls', '-l']
+    """
+    process = subprocess.Popen(args, stdout=subprocess.PIPE,
+                               stderr=subprocess.PIPE)
+    stdout, stderr = process.communicate()
+
+    return (stdout.decode("utf-8"), stderr.decode("utf-8"))