Using dotenv instead of parsing keys ourselves (#1295)

### Motivation and Context

This changes our parsing of the .env file to use
[`python-dotenv`](https://pypi.org/project/python-dotenv/) which will be
more flexible.
Tested that the notebooks would still run correctly.

python/poetry.lock

@@ -2629,7 +2629,7 @@ six = ">=1.5"
 name = "python-dotenv"
 version = "1.0.0"
 description = "Read key-value pairs from a .env file and set them as environment variables"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -4036,4 +4036,4 @@ cffi = ["cffi (>=1.11)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "da5651575ed9ca821808283ee9a4ab370ffce1c7f63ee6533080857d913bad67"
+content-hash = "4596fb06a8467cdd8eed62bd1d425c0f7cdd704405b0fc15ed79af4d98a6ee5f"

python/pyproject.toml

@@ -11,6 +11,7 @@ python = "^3.8"
 numpy = "^1.24.2"
 openai = "^0.27.0"
 aiofiles = "^23.1.0"
+python-dotenv = "1.0.0"
 
 [tool.poetry.group.dev.dependencies]
 pre-commit = "2.21.0"

python/semantic_kernel/utils/settings.py

@@ -1,6 +1,7 @@
 # Copyright (c) Microsoft. All rights reserved.
 
 from typing import Optional, Tuple
+from dotenv import dotenv_values
 
 
 def openai_settings_from_dot_env() -> Tuple[str, Optional[str]]:
@@ -11,20 +12,9 @@ def openai_settings_from_dot_env() -> Tuple[str, Optional[str]]:
         Tuple[str, str]: The OpenAI API key, the OpenAI organization ID
     """
 
-    api_key, org_id = None, None
-    with open(".env", "r") as f:
-        lines = f.readlines()
-
-        for line in lines:
-            if line.startswith("OPENAI_API_KEY"):
-                parts = line.split("=")[1:]
-                api_key = "=".join(parts).strip().strip('"')
-                continue
-
-            if line.startswith("OPENAI_ORG_ID"):
-                parts = line.split("=")[1:]
-                org_id = "=".join(parts).strip().strip('"')
-                continue
+    config = dotenv_values(".env")
+    api_key = config.get("OPENAI_API_KEY", None)
+    org_id = config.get("OPENAI_ORG_ID", None)
 
     assert api_key is not None, "OpenAI API key not found in .env file"
 
@@ -42,24 +32,10 @@ def azure_openai_settings_from_dot_env(include_deployment=True) -> Tuple[str, st
     """
 
     deployment, api_key, endpoint = None, None, None
-    with open(".env", "r") as f:
-        lines = f.readlines()
-
-        for line in lines:
-            if include_deployment and line.startswith("AZURE_OPENAI_DEPLOYMENT_NAME"):
-                parts = line.split("=")[1:]
-                deployment = "=".join(parts).strip().strip('"')
-                continue
-
-            if line.startswith("AZURE_OPENAI_API_KEY"):
-                parts = line.split("=")[1:]
-                api_key = "=".join(parts).strip().strip('"')
-                continue
-
-            if line.startswith("AZURE_OPENAI_ENDPOINT"):
-                parts = line.split("=")[1:]
-                endpoint = "=".join(parts).strip().strip('"')
-                continue
+    config = dotenv_values(".env")
+    deployment = config.get("AZURE_OPENAI_DEPLOYMENT_NAME", None)
+    api_key = config.get("AZURE_OPENAI_API_KEY", None)
+    endpoint = config.get("AZURE_OPENAI_ENDPOINT", None)
 
     # Azure requires the deployment name, the API key and the endpoint URL.
     if include_deployment: