core: Auto-fix some docstrings (#29337)

libs/core/langchain_core/prompts/base.py

@@ -98,13 +98,15 @@ class BasePromptTemplate(
     @classmethod
     def get_lc_namespace(cls) -> list[str]:
         """Get the namespace of the langchain object.
-        Returns ["langchain", "schema", "prompt_template"]."""
+        Returns ["langchain", "schema", "prompt_template"].
+        """
         return ["langchain", "schema", "prompt_template"]
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
         """Return whether this class is serializable.
-        Returns True."""
+        Returns True.
+        """
         return True
 
     model_config = ConfigDict(

libs/core/langchain_core/prompts/chat.py

@@ -54,7 +54,8 @@ class BaseMessagePromptTemplate(Serializable, ABC):
     @classmethod
     def is_lc_serializable(cls) -> bool:
         """Return whether or not the class is serializable.
-        Returns: True"""
+        Returns: True.
+        """
         return True
 
     @classmethod
@@ -392,8 +393,7 @@ class BaseStringMessagePromptTemplate(BaseMessagePromptTemplate, ABC):
 
     @property
     def input_variables(self) -> list[str]:
-        """
-        Input variables for this prompt template.
+        """Input variables for this prompt template.
 
         Returns:
             List of input variable names.
@@ -624,8 +624,7 @@ class _StringImageMessagePromptTemplate(BaseMessagePromptTemplate):
 
     @property
     def input_variables(self) -> list[str]:
-        """
-        Input variables for this prompt template.
+        """Input variables for this prompt template.
 
         Returns:
             List of input variable names.
@@ -742,8 +741,7 @@ class BaseChatPromptTemplate(BasePromptTemplate, ABC):
 
     @property
     def lc_attributes(self) -> dict:
-        """
-        Return a list of attribute names that should be included in the
+        """Return a list of attribute names that should be included in the
         serialized kwargs. These attributes must be accepted by the
         constructor.
         """
@@ -980,7 +978,6 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
             A chat prompt template.
 
         Examples:
-
             Instantiation from a list of message templates:
 
             .. code-block:: python
@@ -1173,7 +1170,6 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
         """Create a chat prompt template from a variety of message formats.
 
         Examples:
-
             Instantiation from a list of message templates:
 
             .. code-block:: python

libs/core/langchain_core/prompts/few_shot.py

@@ -265,7 +265,6 @@ class FewShotChatMessagePromptTemplate(
     to dynamically select examples based on the input.
 
     Examples:
-
         Prompt template with a fixed list of examples (matching the sample
         conversation above):
 

libs/core/langchain_core/prompts/loading.py

@@ -184,8 +184,7 @@ def _load_prompt_from_file(
 
 
 def _load_chat_prompt(config: dict) -> ChatPromptTemplate:
-    """Load chat prompt from config"""
-
+    """Load chat prompt from config."""
     messages = config.pop("messages")
     template = messages[0]["prompt"].pop("template") if messages else None
     config.pop("input_variables")

libs/core/langchain_core/prompts/pipeline.py

@@ -23,8 +23,7 @@ def _get_inputs(inputs: dict, input_variables: list[str]) -> dict:
     ),
 )
 class PipelinePromptTemplate(BasePromptTemplate):
-    """
-    This has been deprecated in favor of chaining individual prompts together in your
+    """This has been deprecated in favor of chaining individual prompts together in your
     code. E.g. using a for loop, you could do:
 
     .. code-block:: python

libs/core/langchain_core/prompts/prompt.py

@@ -284,7 +284,6 @@ class PromptTemplate(StringPromptTemplate):
         Returns:
             The prompt template loaded from the template.
         """
-
         input_variables = get_template_variables(template, template_format)
         _partial_variables = partial_variables or {}
 

libs/core/langchain_core/prompts/string.py

@@ -64,8 +64,7 @@ def jinja2_formatter(template: str, /, **kwargs: Any) -> str:
 
 
 def validate_jinja2(template: str, input_variables: list[str]) -> None:
-    """
-    Validate that the input variables are valid for the template.
+    """Validate that the input variables are valid for the template.
     Issues a warning if missing or extra variables are found.
 
     Args:

libs/core/langchain_core/prompts/structured.py

@@ -72,7 +72,6 @@ class StructuredPrompt(ChatPromptTemplate):
         """Create a chat prompt template from a variety of message formats.
 
         Examples:
-
             Instantiation from a list of message templates:
 
             .. code-block:: python