Update sample code and add poller section

Author: PallabPaul

articles/confidential-ledger/quickstart-python.md

@@ -166,7 +166,7 @@ network_identity = identity_client.get_ledger_identity(
 
 ledger_tls_cert_file_name = "networkcert.pem"
 with open(ledger_tls_cert_file_name, "w") as cert_file:
-    cert_file.write(network_identity.ledger_tls_certificate)
+    cert_file.write(network_identity['ledgerTlsCertificate'])
 ```
 
 Now we can use the network certificate, along with the ledger URL and our credentials, to create a confidential ledger client.
@@ -179,12 +179,10 @@ ledger_client = ConfidentialLedgerClient(
 )
 ```
 
-We are prepared to write to the ledger.  We will do so using the `create_ledger_entry` function.
+We are prepared to write to the ledger. We will do so using the `create_ledger_entry` function.
 
 ```python
-sample_entry = {
-    "contents": "Hello world!"
-}
+sample_entry = {"contents": "Hello world!"}
 append_result = ledger_client.create_ledger_entry(entry=sample_entry)
 print(append_result['transactionId'])
 ```
@@ -196,7 +194,14 @@ latest_entry = ledger_client.get_ledger_entry(transaction_id=append_result['tran
 print(f"Current entry (transaction id = {latest_entry['transactionId']}) in collection {latest_entry['collectionId']}: {latest_entry['contents']}")
 ```
 
-The print function will return "Hello world!", as that is the message in the ledger that that corresponds to the transaction ID.
+If you would simply like the latest transaction that was committed to the ledger, you can use the `get_current_ledger_entry` function.
+
+```python
+latest_entry = ledger_client.get_current_ledger_entry()
+print(f"Current entry (transaction id = {latest_entry['transactionId']}) in collection {latest_entry['collectionId']}: {latest_entry['contents']}")
+```
+
+The print function will return "Hello world!", as that is the message in the ledger that that corresponds to the transaction ID and is the latest transaction.
 
 ## Full sample code
 
@@ -286,33 +291,33 @@ ledger_client = ConfidentialLedgerClient(
 )
 
 # Write to the ledger
-sample_entry = {
-    "contents": "Hello world!"
-}
-append_result = ledger_client.create_ledger_entry(entry=sample_entry)
-print(append_result['transactionId'])
-
-# Wait until transaction is committed on the ledger
-while True:
-    commit_result = ledger_client.get_transaction_status(append_result['transactionId'])
-    print(commit_result['state'])
-    if (commit_result['state'] == "Committed"):
-        break
-    time.sleep(1)
-
-# Wait until entry is read from enclave and validated
-while True:
-    latest_entry = ledger_client.get_ledger_entry(transaction_id=append_result['transactionId'])
-    print(latest_entry['state'])
-    if (latest_entry['state'] == "Ready"):
-        break
-    time.sleep(1)
+sample_entry = {"contents": "Hello world!"}
+ledger_client.create_ledger_entry(entry=sample_entry)
 
 # Read from the ledger
-latest_entry = latest_entry['entry']
+latest_entry = ledger_client.get_current_ledger_entry()
 print(f"Current entry (transaction id = {latest_entry['transactionId']}) in collection {latest_entry['collectionId']}: {latest_entry['contents']}")
 ```
 
+## Pollers
+
+If you would like to wait for your write transaction to be committed to your ledger you can use the `begin_create_ledger_entry` function. This will return a poller to wait until the your entry is durably committed.
+
+```python
+sample_entry = {"contents": "Hello world!"}
+ledger_entry_poller = ledger_client.begin_create_ledger_entry( 
+    entry=sample_entry
+)
+ledger_entry_result = ledger_entry_poller.result()
+```
+
+Querying an older ledger entry requires the ledger to read the entry from disk and validate it. You can use the `begin_get_ledger_entry` function to create a poller that will wait until the queried entry is in a ready state to view.
+
+```python
+get_entry_poller = ledger_client.begin_get_ledger_entry(transaction_id=ledger_entry_result['transactionId'])
+entry = get_entry_poller.result()
+```
+
 ## Clean up resources
 
 Other Azure confidential ledger articles can build upon this quickstart. If you plan to continue on to work with subsequent quickstarts and tutorials, you may wish to leave these resources in place.