Added an example showing how to access provider errors (#403)

Author: AaronDDM

examples/provider_error_demo/README.md

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+# Provider Error Handling Example
+
+This example demonstrates how to properly handle provider errors when working with the Nylas API. It specifically shows how to catch and process errors that occur when trying to access a non-existent calendar.
+
+## Features
+
+- Demonstrates proper error handling for Nylas API provider errors
+- Shows how to access error details including:
+  - Error message
+  - Error type
+  - Provider error message
+  - Request ID
+  - Status code
+- Includes clear output and status messages
+
+## Prerequisites
+
+1. A Nylas account with API access
+2. Python 3.x installed
+3. Local installation of the Nylas Python SDK (this repository)
+
+## Setup
+
+1. Install the SDK in development mode from the repository root:
+```bash
+cd /path/to/nylas-python
+pip install -e .
+```
+
+2. Set your environment variables:
+```bash
+export NYLAS_API_KEY="your_api_key"
+export NYLAS_GRANT_ID="your_grant_id"
+```
+
+3. Run the example from the repository root:
+```bash
+python examples/provider_error_demo/provider_error_example.py
+```
+
+## Example Output
+
+```
+Demonstrating Provider Error Handling
+====================================
+
+Attempting to fetch events from non-existent calendar: non-existent-calendar-123
+------------------------------------------------------------------
+
+Caught NylasApiError:
+✗ Error Message: Calendar not found
+✗ Error Type: invalid_request_error
+✗ Provider Error: The calendar ID provided does not exist
+✗ Request ID: req-abc-123
+✗ Status Code: 404
+
+Example completed!
+```
+
+## Error Handling
+
+The example demonstrates how to handle:
+- Missing environment variables
+- API authentication errors
+- Provider-specific errors
+- Non-existent resource errors
+
+## Documentation
+
+For more information about the Nylas Python SDK and its features, visit:
+- [Nylas Python SDK Documentation](https://developer.nylas.com/docs/sdks/python/)
+- [Nylas API Reference](https://developer.nylas.com/docs/api/) 

examples/provider_error_demo/provider_error_example.py

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+#!/usr/bin/env python3
+"""
+Nylas SDK Example: Handling Provider Errors
+
+This example demonstrates how to handle provider errors when working with the Nylas API,
+specifically when trying to access a non-existent calendar.
+
+Required Environment Variables:
+    NYLAS_API_KEY: Your Nylas API key
+    NYLAS_GRANT_ID: Your Nylas grant ID
+
+Usage:
+    First, install the SDK in development mode:
+    cd /path/to/nylas-python
+    pip install -e .
+
+    Then set environment variables and run:
+    export NYLAS_API_KEY="your_api_key"
+    export NYLAS_GRANT_ID="your_grant_id"
+    python examples/provider_error_demo/provider_error_example.py
+"""
+
+import os
+import sys
+from typing import Optional
+
+from nylas import Client
+from nylas.models.errors import NylasApiError
+
+
+def get_env_or_exit(var_name: str) -> str:
+    """Get an environment variable or exit if not found."""
+    value = os.getenv(var_name)
+    if not value:
+        print(f"Error: {var_name} environment variable is required")
+        sys.exit(1)
+    return value
+
+
+def demonstrate_provider_error(client: Client, grant_id: str) -> None:
+    """Demonstrate how to handle provider errors."""
+    # Use a non-existent calendar ID to trigger a provider error
+    non_existent_calendar_id = "non-existent-calendar-123"
+
+    try:
+        print(f"\nAttempting to fetch events from non-existent calendar: {non_existent_calendar_id}")
+        print("------------------------------------------------------------------")
+        
+        # Attempt to list events with the invalid calendar ID
+        events, request_id = client.events.list(
+            identifier=grant_id,
+            query_params={"calendar_id": non_existent_calendar_id}
+        )
+        
+        # Note: We won't reach this code due to the error
+        print("Events retrieved:", events)
+        
+    except NylasApiError as e:
+        print("\nCaught NylasApiError:")
+        print(f"✗ Error Type: {e.type}")
+        print(f"✗ Provider Error: {e.provider_error}")
+        print(f"✗ Request ID: {e.request_id}")
+        print(f"✗ Status Code: {e.status_code}")
+
+
+def main():
+    """Main function demonstrating provider error handling."""
+    # Get required environment variables
+    api_key = get_env_or_exit("NYLAS_API_KEY")
+    grant_id = get_env_or_exit("NYLAS_GRANT_ID")
+
+    # Initialize Nylas client
+    client = Client(
+        api_key=api_key,
+    )
+
+    print("\nDemonstrating Provider Error Handling")
+    print("====================================")
+
+    # Demonstrate provider error handling
+    demonstrate_provider_error(client, grant_id)
+
+    print("\nExample completed!")
+
+
+if __name__ == "__main__":
+    main()