community[patch]: fix instantiation for Slack tools (langchain-ai#28990)

Believe the current implementation raises PydanticUserError following [this](https://github.com/pydantic/pydantic/releases/tag/v2.10.1) Pydantic release. Resolves langchain-ai#28989
pprados · Jan 3, 2025 · 4f3025d · 4f3025d
1 parent 224a6e9
commit 4f3025d
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diff --git a/libs/community/langchain_community/agent_toolkits/slack/toolkit.py b/libs/community/langchain_community/agent_toolkits/slack/toolkit.py
@@ -13,7 +13,14 @@
 from langchain_community.tools.slack.utils import login
 
 if TYPE_CHECKING:
+    # This is for linting and IDE typehints
     from slack_sdk import WebClient
+else:
+    try:
+        # We do this so pydantic can resolve the types when instantiating
+        from slack_sdk import WebClient
+    except ImportError:
+        pass
 
 
 class SlackToolkit(BaseToolkit):

diff --git a/libs/community/langchain_community/tools/slack/base.py b/libs/community/langchain_community/tools/slack/base.py
@@ -10,7 +10,14 @@
 from langchain_community.tools.slack.utils import login
 
 if TYPE_CHECKING:
+    # This is for linting and IDE typehints
     from slack_sdk import WebClient
+else:
+    try:
+        # We do this so pydantic can resolve the types when instantiating
+        from slack_sdk import WebClient
+    except ImportError:
+        pass
 
 
 class SlackBaseTool(BaseTool):  # type: ignore[override]