langchain[patch]: chat histories to handle optional community dependence (#21194)

libs/langchain/langchain/memory/chat_message_histories/__init__.py

@@ -1,32 +1,69 @@
-import warnings
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
-from langchain_core._api import LangChainDeprecationWarning
+from langchain._api import create_importer
 
-from langchain._api.interactive_env import is_interactive_env
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import (
+        AstraDBChatMessageHistory,
+        CassandraChatMessageHistory,
+        ChatMessageHistory,
+        CosmosDBChatMessageHistory,
+        DynamoDBChatMessageHistory,
+        ElasticsearchChatMessageHistory,
+        FileChatMessageHistory,
+        FirestoreChatMessageHistory,
+        MomentoChatMessageHistory,
+        MongoDBChatMessageHistory,
+        Neo4jChatMessageHistory,
+        PostgresChatMessageHistory,
+        RedisChatMessageHistory,
+        RocksetChatMessageHistory,
+        SingleStoreDBChatMessageHistory,
+        SQLChatMessageHistory,
+        StreamlitChatMessageHistory,
+        UpstashRedisChatMessageHistory,
+        XataChatMessageHistory,
+        ZepChatMessageHistory,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "AstraDBChatMessageHistory": "langchain_community.chat_message_histories",
+    "CassandraChatMessageHistory": "langchain_community.chat_message_histories",
+    "ChatMessageHistory": "langchain_community.chat_message_histories",
+    "CosmosDBChatMessageHistory": "langchain_community.chat_message_histories",
+    "DynamoDBChatMessageHistory": "langchain_community.chat_message_histories",
+    "ElasticsearchChatMessageHistory": "langchain_community.chat_message_histories",
+    "FileChatMessageHistory": "langchain_community.chat_message_histories",
+    "FirestoreChatMessageHistory": "langchain_community.chat_message_histories",
+    "MomentoChatMessageHistory": "langchain_community.chat_message_histories",
+    "MongoDBChatMessageHistory": "langchain_community.chat_message_histories",
+    "Neo4jChatMessageHistory": "langchain_community.chat_message_histories",
+    "PostgresChatMessageHistory": "langchain_community.chat_message_histories",
+    "RedisChatMessageHistory": "langchain_community.chat_message_histories",
+    "RocksetChatMessageHistory": "langchain_community.chat_message_histories",
+    "SQLChatMessageHistory": "langchain_community.chat_message_histories",
+    "SingleStoreDBChatMessageHistory": "langchain_community.chat_message_histories",
+    "StreamlitChatMessageHistory": "langchain_community.chat_message_histories",
+    "UpstashRedisChatMessageHistory": "langchain_community.chat_message_histories",
+    "XataChatMessageHistory": "langchain_community.chat_message_histories",
+    "ZepChatMessageHistory": "langchain_community.chat_message_histories",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
 
 
 def __getattr__(name: str) -> Any:
-    from langchain_community import chat_message_histories
-
-    # If not in interactive env, raise warning.
-    if not is_interactive_env():
-        warnings.warn(
-            "Importing chat message histories from langchain is deprecated. Importing "
-            "from langchain will no longer be supported as of langchain==0.2.0. "
-            "Please import from langchain-community instead:\n\n"
-            f"`from langchain_community.chat_message_histories import {name}`.\n\n"
-            "To install langchain-community run `pip install -U langchain-community`.",
-            category=LangChainDeprecationWarning,
-        )
-
-    return getattr(chat_message_histories, name)
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
 
 
 __all__ = [
     "AstraDBChatMessageHistory",
-    "ChatMessageHistory",
     "CassandraChatMessageHistory",
+    "ChatMessageHistory",
     "CosmosDBChatMessageHistory",
     "DynamoDBChatMessageHistory",
     "ElasticsearchChatMessageHistory",
@@ -34,14 +71,14 @@ __all__ = [
     "FirestoreChatMessageHistory",
     "MomentoChatMessageHistory",
     "MongoDBChatMessageHistory",
+    "Neo4jChatMessageHistory",
     "PostgresChatMessageHistory",
     "RedisChatMessageHistory",
     "RocksetChatMessageHistory",
+    "SingleStoreDBChatMessageHistory",
     "SQLChatMessageHistory",
     "StreamlitChatMessageHistory",
-    "SingleStoreDBChatMessageHistory",
+    "UpstashRedisChatMessageHistory",
     "XataChatMessageHistory",
     "ZepChatMessageHistory",
-    "UpstashRedisChatMessageHistory",
-    "Neo4jChatMessageHistory",
 ]

libs/langchain/langchain/memory/chat_message_histories/astradb.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.astradb import (
-    AstraDBChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["AstraDBChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import AstraDBChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "AstraDBChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "AstraDBChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/cassandra.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.cassandra import (
-    CassandraChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["CassandraChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import CassandraChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "CassandraChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "CassandraChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/cosmos_db.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.cosmos_db import (
-    CosmosDBChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["CosmosDBChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import CosmosDBChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "CosmosDBChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "CosmosDBChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/dynamodb.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.dynamodb import (
-    DynamoDBChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["DynamoDBChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import DynamoDBChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "DynamoDBChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "DynamoDBChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/elasticsearch.py

@@ -1,5 +1,27 @@
-from langchain_community.chat_message_histories.elasticsearch import (
-    ElasticsearchChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["ElasticsearchChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import (
+        ElasticsearchChatMessageHistory,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "ElasticsearchChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "ElasticsearchChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/file.py

@@ -1,3 +1,25 @@
-from langchain_community.chat_message_histories.file import FileChatMessageHistory
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["FileChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import FileChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "FileChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "FileChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/firestore.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.firestore import (
-    FirestoreChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["FirestoreChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import FirestoreChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "FirestoreChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "FirestoreChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/in_memory.py

@@ -1,3 +1,21 @@
-from langchain_community.chat_message_histories.in_memory import ChatMessageHistory
+from typing import TYPE_CHECKING, Any
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories.in_memory import ChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {"ChatMessageHistory": "langchain_community.chat_message_histories"}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = ["ChatMessageHistory"]

libs/langchain/langchain/memory/chat_message_histories/momento.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.momento import (
-    MomentoChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["MomentoChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import MomentoChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "MomentoChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "MomentoChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/mongodb.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.mongodb import (
-    MongoDBChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["MongoDBChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import MongoDBChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "MongoDBChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "MongoDBChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/neo4j.py

@@ -1,3 +1,25 @@
-from langchain_community.chat_message_histories.neo4j import Neo4jChatMessageHistory
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["Neo4jChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import Neo4jChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "Neo4jChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "Neo4jChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/postgres.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.postgres import (
-    PostgresChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["PostgresChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import PostgresChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "PostgresChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "PostgresChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/redis.py

@@ -1,3 +1,25 @@
-from langchain_community.chat_message_histories.redis import RedisChatMessageHistory
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["RedisChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import RedisChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "RedisChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "RedisChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/rocksetdb.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.rocksetdb import (
-    RocksetChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["RocksetChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import RocksetChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "RocksetChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "RocksetChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/singlestoredb.py

@@ -1,5 +1,27 @@
-from langchain_community.chat_message_histories.singlestoredb import (
-    SingleStoreDBChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["SingleStoreDBChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import (
+        SingleStoreDBChatMessageHistory,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "SingleStoreDBChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "SingleStoreDBChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/sql.py

@@ -1,8 +1,30 @@
-from langchain_community.chat_message_histories.sql import (
-    BaseMessageConverter,
-    DefaultMessageConverter,
-    SQLChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
+
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import SQLChatMessageHistory
+    from langchain_community.chat_message_histories.sql import (
+        BaseMessageConverter,
+        DefaultMessageConverter,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "BaseMessageConverter": "langchain_community.chat_message_histories.sql",
+    "DefaultMessageConverter": "langchain_community.chat_message_histories.sql",
+    "SQLChatMessageHistory": "langchain_community.chat_message_histories",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = [
     "BaseMessageConverter",

libs/langchain/langchain/memory/chat_message_histories/streamlit.py

@@ -1,5 +1,25 @@
-from langchain_community.chat_message_histories.streamlit import (
-    StreamlitChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["StreamlitChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import StreamlitChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "StreamlitChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "StreamlitChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/upstash_redis.py

@@ -1,5 +1,27 @@
-from langchain_community.chat_message_histories.upstash_redis import (
-    UpstashRedisChatMessageHistory,
-)
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["UpstashRedisChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import (
+        UpstashRedisChatMessageHistory,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "UpstashRedisChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "UpstashRedisChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/xata.py

@@ -1,3 +1,25 @@
-from langchain_community.chat_message_histories.xata import XataChatMessageHistory
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["XataChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import XataChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "XataChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "XataChatMessageHistory",
+]

libs/langchain/langchain/memory/chat_message_histories/zep.py

@@ -1,3 +1,25 @@
-from langchain_community.chat_message_histories.zep import ZepChatMessageHistory
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["ZepChatMessageHistory"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.chat_message_histories import ZepChatMessageHistory
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "ZepChatMessageHistory": "langchain_community.chat_message_histories"
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "ZepChatMessageHistory",
+]