Python: Add load_dotenv() to samples for .env file support (#4043)

* Initial plan

* Add load_dotenv() to 303 Python samples for environment variable loading

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Update SAMPLE_GUIDELINES.md to document load_dotenv() requirement

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Update samples README.md to document .env file usage

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Run ruff format on all changed sample files

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Clarify load_dotenv() usage in README - local dev vs production

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Remove deprecated getting_started folder as requested

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Document env_file_path parameter for per-client configuration

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Merge main branch to resolve conflicts

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Fix run_evaluation.py file that was empty in merge commit

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Remove dotnet changes from merge - out of scope for this PR

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Remove package and test changes from merge - only sample changes needed

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Remove test_func_utils.py - only sample changes needed

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Revert sample files not in original changeset - keep only load_dotenv additions

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Move load_dotenv() outside snippet tag in 06_host_your_agent.py

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Fix comment placement - move load_dotenv before code comments

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Fix load_dotenv() placement across all samples - after docstring, before code comments

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Merge latest main branch with load_dotenv changes

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Remove non-sample changes from merge - keep only load_dotenv additions

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Revert non-load_dotenv sample changes from merge

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Fix run_evaluation.py - use main's improved version (file already had load_dotenv)

Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>

* Manual update

* Manual update 2

* Fix Role usage and load_dotenv placement per PR review feedback

Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>

* Fix Role usage - use string literals not enum attributes

Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>

* Fix SAMPLE_GUIDELINES.md example - load_dotenv before docstring per guidance

Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>

* Move load_dotenv() before docstrings in all samples per SAMPLE_GUIDELINES ordering

Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>

* Address PR review: rename files, fix placement, add session usage, remove note

Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>

* Update Redis README to reference renamed file redis_history_provider.py

Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: TaoChenOSU <12570346+TaoChenOSU@users.noreply.github.com>
Co-authored-by: Tao Chen <taochen@microsoft.com>
Co-authored-by: eavanvalkenburg <13749212+eavanvalkenburg@users.noreply.github.com>
Co-authored-by: Eduard van Valkenburg <eavanvalkenburg@users.noreply.github.com>

python/samples/02-agents/context_providers/redis/azure_redis_conversation.py

@@ -25,8 +25,12 @@ from agent_framework.azure import AzureOpenAIResponsesClient
 from agent_framework.redis import RedisHistoryProvider
 from azure.identity import AzureCliCredential
 from azure.identity.aio import AzureCliCredential as AsyncAzureCliCredential
+from dotenv import load_dotenv
 from redis.credentials import CredentialProvider
 
+# Load environment variables from .env file
+load_dotenv()
+
 
 class AzureCredentialProvider(CredentialProvider):
     """Credential provider for Azure AD authentication with Redis Enterprise."""

python/samples/02-agents/context_providers/redis/redis_basics.py

@@ -34,9 +34,13 @@ from agent_framework import Message, tool
 from agent_framework.azure import AzureOpenAIResponsesClient
 from agent_framework.redis import RedisContextProvider
 from azure.identity import AzureCliCredential
+from dotenv import load_dotenv
 from redisvl.extensions.cache.embeddings import EmbeddingsCache
 from redisvl.utils.vectorize import OpenAITextVectorizer
 
+# Load environment variables from .env file
+load_dotenv()
+
 # Default Redis URL for local Redis Stack.
 # Override via the REDIS_URL environment variable for remote or authenticated instances.
 REDIS_URL = os.getenv("REDIS_URL", "redis://localhost:6379")

python/samples/02-agents/context_providers/redis/redis_conversation.py

@@ -5,6 +5,10 @@
 This example demonstrates how to use the Redis context provider to persist
 conversational details. Pass it as a constructor argument to create_agent.
 
+Note: For session history persistence, see RedisHistoryProvider in the
+conversations/redis_history_provider.py sample. RedisContextProvider is for
+AI context (RAG, memories), while RedisHistoryProvider stores message history.
+
 Requirements:
   - A Redis instance with RediSearch enabled (e.g., Redis Stack)
   - agent-framework with the Redis extra installed: pip install "agent-framework-redis"
@@ -17,12 +21,17 @@ Run:
 import asyncio
 import os
 
+from agent_framework import AgentSession
 from agent_framework.azure import AzureOpenAIResponsesClient
 from agent_framework.redis import RedisContextProvider
 from azure.identity import AzureCliCredential
+from dotenv import load_dotenv
 from redisvl.extensions.cache.embeddings import EmbeddingsCache
 from redisvl.utils.vectorize import OpenAITextVectorizer
 
+# Load environment variables from .env file
+load_dotenv()
+
 # Default Redis URL for local Redis Stack.
 # Override via the REDIS_URL environment variable for remote or authenticated instances.
 REDIS_URL = os.getenv("REDIS_URL", "redis://localhost:6379")
@@ -73,35 +82,38 @@ async def main() -> None:
         context_providers=[provider],
     )
 
+    # Create a session to manage conversation state
+    session = agent.create_session()
+
     # Teach a user preference; the agent writes this to the provider's memory
     query = "Remember that I enjoy gumbo"
-    result = await agent.run(query)
+    result = await agent.run(query, session=session)
     print("User: ", query)
     print("Agent: ", result)
 
     # Ask the agent to recall the stored preference; it should retrieve from memory
     query = "What do I enjoy?"
-    result = await agent.run(query)
+    result = await agent.run(query, session=session)
     print("User: ", query)
     print("Agent: ", result)
 
     query = "What did I say to you just now?"
-    result = await agent.run(query)
+    result = await agent.run(query, session=session)
     print("User: ", query)
     print("Agent: ", result)
 
     query = "Remember that I have a meeting at 3pm tomorro"
-    result = await agent.run(query)
+    result = await agent.run(query, session=session)
     print("User: ", query)
     print("Agent: ", result)
 
     query = "Tulips are red"
-    result = await agent.run(query)
+    result = await agent.run(query, session=session)
     print("User: ", query)
     print("Agent: ", result)
 
     query = "What was the first thing I said to you this conversation?"
-    result = await agent.run(query)
+    result = await agent.run(query, session=session)
     print("User: ", query)
     print("Agent: ", result)
     # Drop / delete the provider index in Redis

python/samples/02-agents/context_providers/redis/redis_sessions.py

@@ -32,17 +32,20 @@ import os
 from agent_framework.azure import AzureOpenAIResponsesClient
 from agent_framework.redis import RedisContextProvider
 from azure.identity import AzureCliCredential
+from dotenv import load_dotenv
 from redisvl.extensions.cache.embeddings import EmbeddingsCache
 from redisvl.utils.vectorize import OpenAITextVectorizer
 
+# Load environment variables from .env file
+load_dotenv()
+
 # Default Redis URL for local Redis Stack.
 # Override via the REDIS_URL environment variable for remote or authenticated instances.
 REDIS_URL = os.getenv("REDIS_URL", "redis://localhost:6379")
 
+
 # Please set OPENAI_API_KEY to use the OpenAI vectorizer.
 # For chat responses, also set AZURE_AI_PROJECT_ENDPOINT and AZURE_OPENAI_RESPONSES_DEPLOYMENT_NAME.
-
-
 def create_chat_client() -> AzureOpenAIResponsesClient:
     """Create an Azure OpenAI Responses client using a Foundry project endpoint."""
     return AzureOpenAIResponsesClient(