docs: add Google-style docstrings to TransactionRecord (#711)

Signed-off-by: DinethShakya23 <dinethshakya19@gmail.com>

Author: DinethShakya23

CHANGELOG.md

@@ -8,6 +8,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 
 ### Added
 - docs: Add Google-style docstrings to `TokenId` class and its methods in `token_id.py`.
+- added Google-style docstrings to the `TransactionRecord` class including all dataclass fields, `__repr__`, `_from_proto()` & `_to_proto()` methods.
 - Standardized docstrings, improved error handling, and updated type hinting (`str | None` to `Optional[str]`) for the `FileId` class (#652).
 
 - Add Google-style docstrings to `AccountInfo` class and its methods in `account_info.py`.

src/hiero_sdk_python/transaction/transaction_record.py

@@ -1,3 +1,21 @@
+"""
+This module implements the TransactionRecord class which represents a complete record
+of a transaction executed on the Hiero network. It serves as a comprehensive data
+structure that captures all aspects of a transaction's execution and its effects.
+
+The module provides functionality to:
+- Store and access detailed transaction metadata (ID, hash, memo, fees)
+- Track various types of asset transfers:
+  * HBAR cryptocurrency transfers between accounts
+  * Fungible token transfers with amounts
+  * Non-fungible token (NFT) transfers with serial numbers
+- Handle smart contract execution results
+- Process airdrop records for token distributions
+- Manage pseudo-random number generation (PRNG) outputs
+- Convert between Hiero's internal representation and protobuf messages
+
+"""
+
 from collections import defaultdict
 from dataclasses import dataclass, field
 from typing import Optional
@@ -15,7 +33,30 @@
 @dataclass
 class TransactionRecord:
     """
-    Represents a transaction record on the network.
+    Represents a record of a completed transaction on the Hiero network.
+    This class combines detailed information about the a transaction including the
+    transaction ID, receipt, token and NFT transfers, fees & other
+    metadata such as pseudo-random number generation(PRNG) results and 
+    pending airdrop records.
+
+    Attributes:
+        transaction_id (Optional[TransactionId]):         The unique identifier of the transaction.
+        transaction_hash (Optional[bytes]):               The raw hash of the transaction as recorded on-chain.
+        transaction_memo (Optional[str]):                 A text memo associated with the transaction.
+        transaction_fee (Optional[int]):                  The total network fee (in tinybars) charged for the transaction.
+        receipt (Optional[TransactionReceipt]):           The receipt summarizing the outcome and status of the transaction.
+        call_result (Optional[ContractFunctionResult]):   The result of a contract call if the transaction was a smart contract execution.
+        token_transfers (defaultdict[TokenId, defaultdict[AccountId, int]]): 
+                                                          A mapping of token IDs to account-level transfer amounts. 
+                                                          Represents fungible token movements within the transaction.                                        
+        nft_transfers (defaultdict[TokenId, list[TokenNftTransfer]]): 
+                                                          A mapping of token IDs to lists of NFT transfers for that token.
+        transfers (defaultdict[AccountId, int]):          A mapping of account IDs to hbar transfer amounts (positive for credit, negative for debit).
+        new_pending_airdrops (list[PendingAirdropRecord]):A list of new airdrop records created by this transaction.
+            
+        prng_number (Optional[int]):                      A pseudo-random integer generated by the network (if applicable).
+        prng_bytes (Optional[bytes]):                     A pseudo-random byte array generated by the network (if applicable).
+    
     """
 
     transaction_id: Optional[TransactionId] = None
@@ -34,6 +75,16 @@ class TransactionRecord:
     prng_bytes: Optional[bytes] = None
 
     def __repr__(self) -> str:
+        """Returns a human-readable string representation of the TransactionRecord.
+        
+        This method constructs a detailed string containing all significant fields of the 
+        transaction record including transaction ID, hash, memo, fees, status, transfers,
+        and PRNG results. For the receipt status, it attempts to resolve the numeric status
+        to a human-readable ResponseCode name.
+        
+        Returns:
+            str: A string representation showing all significant fields of the TransactionRecord.
+        """
         status = None
         if self.receipt:
             try:
@@ -57,12 +108,31 @@ def __repr__(self) -> str:
 
     @classmethod
     def _from_proto(cls, proto: transaction_record_pb2.TransactionRecord, transaction_id: Optional[TransactionId] = None) -> 'TransactionRecord':
-        """
-        Creates a TransactionRecord from a protobuf record.
+        """Creates a TransactionRecord instance from a protobuf transaction record.
+
+        This method performs complex data aggregation from the protobuf message,
+        including:
+        - Basic transaction metadata (hash, memo, fees)
+        - Token transfers (both fungible and non-fungible)
+        - Account balance transfers
+        - Contract execution results
+        - Airdrop records
+        - PRNG (pseudo-random number generation) results
+
+        The method maps all nested transfer data from the raw protobuf message into
+        the structured format used by the TransactionRecord class & organizing them
+        into appropriate defaultdict collections for efficient access.
 
         Args:
-            proto: The protobuf transaction record
-            transaction_id: Optional transaction ID to associate with the record
+            proto (transaction_record_pb2.TransactionRecord): The raw protobuf 
+                transaction record containing all transaction data.
+            transaction_id (Optional[TransactionId]): Optional transaction ID to 
+                associate with the record. If not provided, will be extracted from
+                the protobuf message if available.
+
+        Returns:
+            TransactionRecord: A new TransactionRecord instance containing all the
+            processed and structured data from the protobuf message.
         """
         token_transfers = defaultdict(lambda: defaultdict(int))
         for token_transfer_list in proto.tokenTransferLists:
@@ -106,8 +176,25 @@ def _from_proto(cls, proto: transaction_record_pb2.TransactionRecord, transactio
         )
 
     def _to_proto(self) -> transaction_record_pb2.TransactionRecord:
-        """
-        Returns the underlying protobuf transaction record.
+        """Converts the TransactionRecord instance to its protobuf representation.
+
+        This method serializes all components of the transaction record into a protobuf message,
+        including:
+        - Basic transaction metadata (hash, memo, fees)
+        - Token transfers (both fungible and non-fungible)
+        - Account balance transfers
+        - Contract execution results
+        - Airdrop records
+        - PRNG (pseudo-random number generation) results
+
+        The method performs a deep conversion of all nested objects (token transfers,
+        NFT transfers, account transfers, and pending airdrops) to their respective
+        protobuf representations.
+
+        Returns:
+            transaction_record_pb2.TransactionRecord: A protobuf message containing
+            all the transaction record data in a format suitable for network transmission
+            or storage.
         """
         record_proto = transaction_record_pb2.TransactionRecord(
             transactionHash=self.transaction_hash,