Cleanup of ruff warnings use isinstance() instead of type() (#9655)

Minor cosmetic PR just cleanup of `ruff` warnings use `isinstance()`
instead of `type()`

libs/langchain/langchain/document_loaders/mhtml.py

@@ -52,7 +52,7 @@ class MHTMLLoader(BaseLoader):
             message = email.message_from_string(f.read())
             parts = message.get_payload()
 
-            if type(parts) is not list:
+            if not isinstance(parts, list):
                 parts = [message]
 
             for part in parts:

libs/langchain/langchain/retrievers/self_query/myscale.py

@@ -103,7 +103,7 @@ class MyScaleTranslator(Visitor):
         value = comparison.value
         comp = comparison.comparator
 
-        value = f"'{value}'" if type(value) is str else value
+        value = f"'{value}'" if isinstance(value, str) else value
 
         # convert timestamp for datetime objects
         if type(value) is datetime.date:

libs/langchain/langchain/utilities/serpapi.py

@@ -129,7 +129,7 @@ class SerpAPIWrapper(BaseModel):
         """Process response from SerpAPI."""
         if "error" in res.keys():
             raise ValueError(f"Got error from SerpAPI: {res['error']}")
-        if "answer_box" in res.keys() and type(res["answer_box"]) == list:
+        if "answer_box" in res.keys() and isinstance(res["answer_box"], list):
             res["answer_box"] = res["answer_box"][0]
         if "answer_box" in res.keys() and "answer" in res["answer_box"].keys():
             toret = res["answer_box"]["answer"]

libs/langchain/tests/integration_tests/document_loaders/test_joplin.py

@@ -5,7 +5,7 @@ def test_joplin_loader() -> None:
     loader = JoplinLoader()
     docs = loader.load()
 
-    assert type(docs) is list
-    assert type(docs[0].page_content) is str
-    assert type(docs[0].metadata["source"]) is str
-    assert type(docs[0].metadata["title"]) is str
+    assert isinstance(docs, list)
+    assert isinstance(docs[0].page_content, str)
+    assert isinstance(docs[0].metadata["source"], str)
+    assert isinstance(docs[0].metadata["title"], str)