account balance query in readme and with flexible syntax

README.md

@@ -14,6 +14,7 @@ This is a Python SDK for interacting with the Hedera Hashgraph platform. It allo
 - [Running Tests](#running-tests)
 - [Usage](#usage)
   - [Creating an Account](#creating-an-account)
+  - [Querying Account Balance](#querying-account-balance)
   - [Creating a Token](#creating-a-token)
   - [Associating a Token](#associating-a-token)
   - [Transferring Tokens](#transferring-tokens)
@@ -155,6 +156,17 @@ transaction = (
     transaction.execute(client)
 ```
 
+### Querying Account Balance
+
+#### Pythonic Syntax:
+```
+balance = CryptoGetAccountBalanceQuery(account_id=some_account_id).execute(client) print(f"Account balance: {balance.hbars} hbars")
+```
+
+#### Method Chaining:
+```
+balance = ( CryptoGetAccountBalanceQuery() .set_account_id(some_account_id) .execute(client) ) print(f"Account balance: {balance.hbars} hbars")
+```
 
 ### Creating a Token
 

examples/query_balance.py

@@ -18,25 +18,21 @@
 def create_account_and_transfer():
     network = Network(network='testnet')
     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)
 
     new_account_private_key = PrivateKey.generate()
     new_account_public_key = new_account_private_key.public_key()
-
-    initial_balance = Hbar(10) 
-    transaction = (
-        AccountCreateTransaction()
-        .set_key(new_account_public_key)
-        .set_initial_balance(initial_balance)
-        .set_account_memo("New Account")
-        .freeze_with(client)
-    )
+    transaction = AccountCreateTransaction(
+        key=new_account_public_key,
+        initial_balance=Hbar(10),
+        memo="New Account"
+    ).freeze_with(client)
     transaction.sign(operator_key)
     receipt = transaction.execute(client)
     new_account_id = receipt.accountId
-    print(f"New account created with ID: {new_account_id}")
 
     balance_query = CryptoGetAccountBalanceQuery().set_account_id(new_account_id)
     balance = balance_query.execute(client)
@@ -48,8 +44,8 @@ def create_account_and_transfer():
         .add_hbar_transfer(operator_id, -transfer_amount.to_tinybars())
         .add_hbar_transfer(new_account_id, transfer_amount.to_tinybars())
         .freeze_with(client)
-        .sign(operator_key)
     )
+    transfer_transaction.sign(operator_key)
     transfer_receipt = transfer_transaction.execute(client)
     print(f"Transfer transaction status: {ResponseCode.get_name(transfer_receipt.status)}")
 
@@ -60,4 +56,4 @@ def create_account_and_transfer():
     print(f"Updated balance of new account: {updated_balance.hbars} hbars")
 
 if __name__ == "__main__":
-    create_account_and_transfer()
+    create_account_and_transfer()

src/hedera_sdk_python/account/account_create_transaction.py

@@ -1,3 +1,5 @@
+from typing import Union
+
 from hedera_sdk_python.transaction.transaction import Transaction
 from hedera_sdk_python.hapi.services import crypto_create_pb2, duration_pb2
 from hedera_sdk_python.response_code import ResponseCode
@@ -10,15 +12,22 @@ class AccountCreateTransaction(Transaction):
     Represents an account creation transaction on the Hedera network.
     """
 
-    def __init__(self, key=None, initial_balance=0, receiver_signature_required=False, auto_renew_period=7890000, memo=""):
+    def __init__(
+        self,
+        key: PublicKey = None,
+        initial_balance: Union[Hbar, int] = 0,
+        receiver_signature_required: bool = False,
+        auto_renew_period: int = 7890000,  # 90 days in seconds
+        memo: str = ""
+    ):
         """
-        Initializes a new AccountCreateTransaction instance with default values or keyword arguments.
+        Initializes a new AccountCreateTransaction instance with default values or specified keyword arguments.
 
         Args:
             key (PublicKey, optional): The public key for the new account.
-            initial_balance (int or Hbar, optional): Initial balance in tinybars or as an Hbar instance.
+            initial_balance (Hbar or int, optional): Initial balance in Hbar or tinybars.
             receiver_signature_required (bool, optional): Whether receiver signature is required.
-            auto_renew_period (int, optional): Auto-renew period in seconds (default is 90 days).
+            auto_renew_period (int, optional): Auto-renew period in seconds (default is ~90 days).
             memo (str, optional): Memo for the account.
         """
         super().__init__()
@@ -27,32 +36,78 @@ def __init__(self, key=None, initial_balance=0, receiver_signature_required=Fals
         self.receiver_signature_required = receiver_signature_required
         self.auto_renew_period = auto_renew_period
         self.account_memo = memo
-
         self._default_transaction_fee = 300_000_000
 
-    def set_initial_balance(self, balance):
+    def set_key(self, key: PublicKey):
+        """
+        Sets the public key for the new account.
+
+        Args:
+            key (PublicKey): The public key to assign to the account.
+
+        Returns:
+            AccountCreateTransaction: The current transaction instance for method chaining.
+        """
         self._require_not_frozen()
-        if not isinstance(balance, (Hbar, int)):
-            raise TypeError("initial_balance must be an instance of Hbar or int representing tinybars.")
-        self.initial_balance = balance
+        self.key = key
         return self
 
-    def set_key(self, key: PublicKey):
+    def set_initial_balance(self, balance: Union[Hbar, int]):
+        """
+        Sets the initial balance for the new account.
+
+        Args:
+            balance (Hbar or int): The initial balance in Hbar or tinybars.
+
+        Returns:
+            AccountCreateTransaction: The current transaction instance for method chaining.
+        """
         self._require_not_frozen()
-        self.key = key
+        if not isinstance(balance, (Hbar, int)):
+            raise TypeError(
+                "initial_balance must be either an instance of Hbar or an integer (tinybars)."
+            )
+        self.initial_balance = balance
         return self
 
     def set_receiver_signature_required(self, required: bool):
+        """
+        Sets whether a receiver signature is required.
+
+        Args:
+            required (bool): True if required, False otherwise.
+
+        Returns:
+            AccountCreateTransaction: The current transaction instance for method chaining.
+        """
         self._require_not_frozen()
         self.receiver_signature_required = required
         return self
 
     def set_auto_renew_period(self, seconds: int):
+        """
+        Sets the auto-renew period in seconds.
+
+        Args:
+            seconds (int): The auto-renew period.
+
+        Returns:
+            AccountCreateTransaction: The current transaction instance for method chaining.
+        """
         self._require_not_frozen()
         self.auto_renew_period = seconds
         return self
 
     def set_account_memo(self, memo: str):
+        """
+        Sets the memo for the new account.
+
+        Args:
+            memo (str): The memo to associate with the account.
+
+        Returns:
+            AccountCreateTransaction: The current transaction instance for method chaining.
+        """
         self._require_not_frozen()
         self.account_memo = memo
         return self
@@ -66,18 +121,17 @@ def build_transaction_body(self):
 
         Raises:
             ValueError: If required fields are missing.
+            TypeError: If initial_balance is an invalid type.
         """
         if not self.key:
-            raise ValueError("Key must be set.")
-
-        if self.initial_balance is None:
-            initial_balance_tinybars = 0
-        elif isinstance(self.initial_balance, Hbar):
+            raise ValueError("Key must be set before building the transaction.")
+
+        if isinstance(self.initial_balance, Hbar):
             initial_balance_tinybars = self.initial_balance.to_tinybars()
         elif isinstance(self.initial_balance, int):
             initial_balance_tinybars = self.initial_balance
         else:
-            raise TypeError("initial_balance must be an instance of Hbar or int representing tinybars.")
+            raise TypeError("initial_balance must be Hbar or int (tinybars).")
 
         crypto_create_body = crypto_create_pb2.CryptoCreateTransactionBody(
             key=self.key.to_proto(),
@@ -111,7 +165,9 @@ def _execute_transaction(self, client, transaction_proto):
         if response.nodeTransactionPrecheckCode != ResponseCode.OK:
             error_code = response.nodeTransactionPrecheckCode
             error_message = ResponseCode.get_name(error_code)
-            raise Exception(f"Error during transaction submission: {error_code} ({error_message})")
+            raise Exception(
+                f"Error during transaction submission: {error_code} ({error_message})"
+            )
 
         receipt = self.get_receipt(client)
         return receipt
@@ -121,7 +177,7 @@ def get_receipt(self, client, timeout=60):
         Retrieves the receipt for the transaction.
 
         Args:
-            client (Client): The client instance.
+            client (Client): The client instance to query.
             timeout (int): Maximum time in seconds to wait for the receipt.
 
         Returns:
@@ -131,7 +187,5 @@ def get_receipt(self, client, timeout=60):
             Exception: If the transaction ID is not set or if receipt retrieval fails.
         """
         if self.transaction_id is None:
-            raise Exception("Transaction ID is not set.")
-
-        receipt = client.get_transaction_receipt(self.transaction_id, timeout)
-        return receipt
+            raise Exception("Transaction ID is not set. Did you forget to sign or execute the transaction?")
+        return client.get_transaction_receipt(self.transaction_id, timeout)

src/hedera_sdk_python/query/account_balance_query.py

@@ -12,10 +12,15 @@ class CryptoGetAccountBalanceQuery(Query):
     including hbars and tokens.
     """
 
-    def __init__(self):
-        """Initializes a new instance of the CryptoGetAccountBalanceQuery class."""
+    def __init__(self, account_id: AccountId = None):
+        """
+        Initializes a new instance of the CryptoGetAccountBalanceQuery class.
+
+        Args:
+            account_id (AccountId, optional): The ID of the account to retrieve the balance for.
+        """
         super().__init__()
-        self.account_id = None
+        self.account_id = account_id
 
     def set_account_id(self, account_id: AccountId):
         """

test.py

@@ -17,6 +17,7 @@
 from hedera_sdk_python.consensus.topic_delete_transaction import TopicDeleteTransaction
 from hedera_sdk_python.consensus.topic_id import TopicId
 from hedera_sdk_python.query.topic_info_query import TopicInfoQuery
+from hedera_sdk_python.query.account_balance_query import CryptoGetAccountBalanceQuery
 
 load_dotenv()
 
@@ -57,6 +58,11 @@ def create_new_account(client, initial_balance=100000000):
 
     return new_account_id, new_account_private_key
 
+def query_balance(client, account_id):
+    balance = CryptoGetAccountBalanceQuery(account_id=account_id).execute(client)
+    print(f"Account {account_id} balance: {balance.hbars}")
+    return balance
+
 def create_token(client, operator_id, admin_key):
     transaction = TokenCreateTransaction(
         token_name="ExampleToken",
@@ -240,6 +246,7 @@ def main():
     client.set_operator(operator_id, operator_key)
 
     recipient_id, recipient_private_key = create_new_account(client)
+    query_balance(client, recipient_id)
 
     token_id = create_token(client, operator_id, admin_key)
     associate_token(client, recipient_id, recipient_private_key, token_id)
@@ -249,7 +256,7 @@ def main():
     topic_id = create_topic(client)
     submit_message(client, topic_id)
     update_topic(client, topic_id)
-    # query_topic_info(client, topic_id)
+    query_topic_info(client, topic_id)
     delete_topic(client, topic_id)
 
 if __name__ == "__main__":

tests/test_account_balance_query.py

@@ -0,0 +1,40 @@
+import pytest
+from unittest.mock import MagicMock
+from hedera_sdk_python.query.account_balance_query import CryptoGetAccountBalanceQuery
+from hedera_sdk_python.account.account_id import AccountId
+from hedera_sdk_python.account.account_balance import AccountBalance
+from hedera_sdk_python.client.client import Client
+from hedera_sdk_python.hbar import Hbar
+from hedera_sdk_python.response_code import ResponseCode
+
+@pytest.mark.usefixtures("mock_account_ids")
+def test_build_account_balance_query(mock_account_ids):
+    """
+    Test building a CryptoGetAccountBalanceQuery with a valid account ID.
+    """
+    account_id_sender, account_id_recipient, node_account_id, token_id_1, token_id_2 = mock_account_ids
+    query = CryptoGetAccountBalanceQuery(account_id=account_id_sender)
+    assert query.account_id == account_id_sender
+
+@pytest.mark.usefixtures("mock_account_ids")
+def test_execute_account_balance_query(mock_account_ids):
+    """
+    Test executing the CryptoGetAccountBalanceQuery with a mocked client.
+    """
+    account_id_sender, account_id_recipient, node_account_id, token_id_1, token_id_2 = mock_account_ids
+    query = CryptoGetAccountBalanceQuery().set_account_id(account_id_sender)
+    mock_client = MagicMock(spec=Client)
+    mock_response = MagicMock()
+    mock_response.cryptogetAccountBalance.balance = 100000000
+    mock_response.cryptogetAccountBalance.tokenBalances = []
+    mock_response.cryptogetAccountBalance.header.nodeTransactionPrecheckCode = ResponseCode.OK
+    mock_client.send_query = MagicMock(return_value=mock_response)
+    query.node_account_ids = [node_account_id]
+    query._make_request = MagicMock(return_value="fake_request")
+    query._get_status_from_response = MagicMock(return_value=ResponseCode.OK)
+    query._map_response = MagicMock(
+        return_value=AccountBalance(Hbar.from_tinybars(100000000))
+    )
+    balance = query.execute(mock_client)
+    assert balance.hbars.to_tinybars() == 100000000
+    print("Test passed: CryptoGetAccountBalanceQuery executed successfully.")