refactor: use Client.from_env() in contract_delete_transaction example (hiero-ledger#1823)

Signed-off-by: Raj <sinhars303@gmail.com>

Author: Rajsinha7

CHANGELOG.md

@@ -16,6 +16,8 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 
 ### Examples
 
+- Refactored contract_delete_transaction example to use Client.from_env. (#1823)
+
 ### Docs
 - Improved Google-style docstring for `compress_point_unchecked` in `crypto_utils.py`. (#1625)
 - chore: update office hours and community calls to use direct links (`#1804`)

examples/contract/contract_delete_transaction.py

@@ -20,12 +20,13 @@
     uv run -m examples.contract.contract_delete_transaction
     python -m examples.contract.contract_delete_transaction
 """
-import os
+
 import sys
 
-from dotenv import load_dotenv
 
-from hiero_sdk_python import AccountId, Client, Network, PrivateKey
+
+from hiero_sdk_python import Client
+
 from hiero_sdk_python.contract.contract_create_transaction import (
     ContractCreateTransaction,
 )
@@ -41,22 +42,15 @@
 # The contract bytecode is pre-compiled from Solidity source code
 from .contracts import SIMPLE_CONTRACT_BYTECODE
 
-load_dotenv()
-
-network_name = os.getenv("NETWORK", "testnet").lower()
 
 
-def setup_client():
-    """Initialize and set up the client with operator account."""
-    network = Network(network_name)
-    print(f"Connecting to Hedera {network_name} network!")
-    client = Client(network)
-
-    operator_id = AccountId.from_string(os.getenv("OPERATOR_ID", ""))
-    operator_key = PrivateKey.from_string(os.getenv("OPERATOR_KEY", ""))
-    client.set_operator(operator_id, operator_key)
+def setup_client() -> Client:
+    """
+    Set up and configure the client by loading OPERATOR_ID and OPERATOR_KEY with Client.from_env().
+    """
+    client = Client.from_env()
+    print(f"Connecting to Hedera {client.network.network} network!")
     print(f"Client set up with operator id {client.operator_account_id}")
-
     return client