fix: update langchain imports for v1.0+ compatibility

- Change ResponseSchema and StructuredOutputParser imports to use
  langchain_classic.output_parsers instead of langchain_core.output_parsers
- Change create_extraction_chain import to use langchain_classic.chains
  instead of langchain.chains
- Add langchain-classic>=1.0.0 as explicit dependency
- Relax async-timeout requirement to >=4.0.0 for compatibility

Fixes #1017

Signed-off-by: majiayu000 <1835304752@qq.com>

pyproject.toml

@@ -11,6 +11,7 @@ authors = [
 
 dependencies = [
     "langchain>=1.2.0",
+    "langchain-classic>=1.0.0",
     "langchain-openai>=1.1.6",
     "langchain-mistralai>=1.1.1",
     "langchain_community>=0.3.31",
@@ -26,7 +27,7 @@ dependencies = [
     "playwright>=1.57.0",
     "undetected-playwright>=0.3.0",
     "semchunk>=3.2.5",
-    "async-timeout>=5.0.1",
+    "async-timeout>=4.0.0",
     "simpleeval>=1.0.3",
     "jsonschema>=4.25.1",
     "duckduckgo-search>=8.1.1",

scrapegraphai/builders/graph_builder.py

@@ -2,7 +2,7 @@
 GraphBuilder Module
 """
 
-from langchain.chains import create_extraction_chain
+from langchain_classic.chains import create_extraction_chain
 from langchain_community.chat_models import ErnieBotChat
 from langchain_core.prompts import ChatPromptTemplate
 from langchain_openai import ChatOpenAI
@@ -113,7 +113,9 @@ class GraphBuilder:
         {nodes_description}
 
         Based on the user's input: "{input}", identify the essential nodes required for the task and suggest a graph configuration that outlines the flow between the chosen nodes.
-        """.format(nodes_description=self.nodes_description, input="{input}")
+        """.format(
+            nodes_description=self.nodes_description, input="{input}"
+        )
         extraction_prompt = ChatPromptTemplate.from_template(
             create_graph_prompt_template
         )

scrapegraphai/nodes/generate_code_node.py

@@ -12,10 +12,10 @@ from typing import Any, Dict, List, Optional
 from bs4 import BeautifulSoup
 from jsonschema import ValidationError as JSONSchemaValidationError
 from jsonschema import validate
-from langchain_core.output_parsers import ResponseSchema, StructuredOutputParser
-from langchain_core.prompts import PromptTemplate
+from langchain_classic.output_parsers import ResponseSchema, StructuredOutputParser
 from langchain_community.chat_models import ChatOllama
 from langchain_core.output_parsers import StrOutputParser
+from langchain_core.prompts import PromptTemplate
 
 from ..prompts import TEMPLATE_INIT_CODE_GENERATION, TEMPLATE_SEMANTIC_COMPARISON
 from ..utils import (