🚀 feat(customs.py): re-add PythonFunction to CUSTOM_NODES (#450)

src/backend/langflow/config.yaml

@@ -84,6 +84,7 @@ tools:
   - Serper Search
   - Tool
   - PythonFunctionTool
+  - PythonFunction
   - JsonSpec
   - News API
   - TMDB API

src/backend/langflow/custom/customs.py

@@ -5,6 +5,7 @@ CUSTOM_NODES = {
     "prompts": {"ZeroShotPrompt": frontend_node.prompts.ZeroShotPromptNode()},
     "tools": {
         "PythonFunctionTool": frontend_node.tools.PythonFunctionToolNode(),
+        "PythonFunction": frontend_node.tools.PythonFunctionNode(),
         "Tool": frontend_node.tools.ToolNode(),
     },
     "agents": {

src/backend/langflow/interface/loading.py

@@ -24,7 +24,7 @@ from langflow.interface.importing.utils import get_function, import_by_type
 from langflow.interface.toolkits.base import toolkits_creator
 from langflow.interface.types import get_type_list
 from langflow.interface.utils import load_file_into_dict
-from langflow.utils import util
+from langflow.utils import util, validate
 
 
 def instantiate_class(node_type: str, base_type: str, params: Dict) -> Any:
@@ -101,6 +101,12 @@ def instantiate_tool(node_type, class_object, params):
     elif node_type == "PythonFunctionTool":
         params["func"] = get_function(params.get("code"))
         return class_object(**params)
+    # For backward compatibility
+    elif node_type == "PythonFunction":
+        function_string = params["code"]
+        if isinstance(function_string, str):
+            return validate.eval_function(function_string)
+        raise ValueError("Function should be a string")
     elif node_type.lower() == "tool":
         return class_object(**params)
     return class_object(**params)

src/backend/langflow/interface/tools/constants.py

@@ -9,10 +9,14 @@ from langchain.agents.load_tools import (
 from langchain.tools.json.tool import JsonSpec
 
 from langflow.interface.importing.utils import import_class
-from langflow.interface.tools.custom import PythonFunctionTool
+from langflow.interface.tools.custom import PythonFunctionTool, PythonFunction
 
 FILE_TOOLS = {"JsonSpec": JsonSpec}
-CUSTOM_TOOLS = {"Tool": Tool, "PythonFunctionTool": PythonFunctionTool}
+CUSTOM_TOOLS = {
+    "Tool": Tool,
+    "PythonFunctionTool": PythonFunctionTool,
+    "PythonFunction": PythonFunction,
+}
 
 OTHER_TOOLS = {tool: import_class(f"langchain.tools.{tool}") for tool in tools.__all__}
 

src/backend/langflow/interface/tools/custom.py

@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Callable, Optional
 from langflow.interface.importing.utils import get_function
 
 from pydantic import BaseModel, validator
@@ -9,6 +9,7 @@ from langchain.agents.tools import Tool
 
 class Function(BaseModel):
     code: str
+    function: Optional[Callable] = None
     imports: Optional[str] = None
 
     # Eval code and store the function
@@ -25,6 +26,12 @@ class Function(BaseModel):
 
         return v
 
+    def get_function(self):
+        """Get the function"""
+        function_name = validate.extract_function_name(self.code)
+
+        return validate.create_function(self.code, function_name)
+
 
 class PythonFunctionTool(Function, Tool):
     """Python function"""
@@ -39,3 +46,9 @@ class PythonFunctionTool(Function, Tool):
         self.code = code
         self.func = get_function(self.code)
         super().__init__(name=name, description=description, func=self.func)
+
+
+class PythonFunction(Function):
+    """Python function"""
+
+    code: str

src/backend/langflow/template/frontend_node/llms.py

@@ -66,5 +66,5 @@ class LLMFrontendNode(FrontendNode):
             field.show = True
 
         LLMFrontendNode.format_openai_field(field)
-        if "azure" in name.lower():
+        if name and "azure" in name.lower():
             LLMFrontendNode.format_azure_field(field)

src/backend/langflow/template/frontend_node/tools.py

@@ -103,3 +103,27 @@ class PythonFunctionToolNode(FrontendNode):
 
     def to_dict(self):
         return super().to_dict()
+
+
+class PythonFunctionNode(FrontendNode):
+    name: str = "PythonFunction"
+    template: Template = Template(
+        type_name="python_function",
+        fields=[
+            TemplateField(
+                field_type="code",
+                required=True,
+                placeholder="",
+                is_list=False,
+                show=True,
+                value=DEFAULT_PYTHON_FUNCTION,
+                name="code",
+                advanced=False,
+            )
+        ],
+    )
+    description: str = "Python function to be executed."
+    base_classes: list[str] = ["function"]
+
+    def to_dict(self):
+        return super().to_dict()