portkey-python-sdk（portkey Python SDK 搜索）

Portkey Python SDK

The Portkey Python SDK provides a unified interface to 200+ LLMs through the Portkey AI Gateway. Built on top of the OpenAI SDK for seamless compatibility, it adds production-grade features: automatic fallbacks, retries, load balancing, semantic caching, guardrails, and comprehensive observability.

Additional References:

• API Reference - Response structures, error handling
• Advanced Features - Tool calling, embeddings, audio, images
• Framework Integrations - LangChain, LlamaIndex, Strands, Google ADK
• Provider Configuration - Azure, AWS Bedrock, Vertex AI setup

Installation

pip install portkey-ai

# Or with poetry/uv
poetry add portkey-ai
uv add portkey-ai

Quick Start

import os
from portkey_ai import Portkey

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    virtual_key="your-openai-virtual-key"
)

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello!"}]
)

print(response.choices[0].message.content)

Authentication

API Key + Virtual Key (Recommended)

Virtual keys securely store provider API keys in Portkey's vault:

import os
from portkey_ai import Portkey

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],  # From app.portkey.ai
    virtual_key="openai-virtual-key-xxx"     # From app.portkey.ai/virtual-keys
)

Using Config IDs

Pre-configure routing, fallbacks, and caching in the dashboard:

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    config="pc-config-xxx"  # Config ID from dashboard
)

Chat Completions

Basic Request

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Explain quantum computing briefly."}
    ]
)

print(response.choices[0].message.content)
print(f"Tokens used: {response.usage.total_tokens}")

Streaming

stream = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Write a short story"}],
    stream=True
)

for chunk in stream:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="", flush=True)

Async Support

import asyncio
from portkey_ai import AsyncPortkey

async def main():
    client = AsyncPortkey(
        api_key=os.environ["PORTKEY_API_KEY"],
        virtual_key="openai-key"
    )

    response = await client.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "Hello!"}]
    )
    print(response.choices[0].message.content)

asyncio.run(main())

Async Streaming

async def stream_response():
    client = AsyncPortkey(
        api_key=os.environ["PORTKEY_API_KEY"],
        virtual_key="openai-key"
    )

    stream = await client.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "Write a poem"}],
        stream=True
    )

    async for chunk in stream:
        if chunk.choices[0].delta.content:
            print(chunk.choices[0].delta.content, end="", flush=True)

Gateway Features

Fallbacks

Automatic failover when a provider fails:

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    config={
        "strategy": {"mode": "fallback"},
        "targets": [
            {
                "virtual_key": "openai-key",
                "override_params": {"model": "gpt-4o"}
            },
            {
                "virtual_key": "anthropic-key",
                "override_params": {"model": "claude-3-5-sonnet-20241022"}
            }
        ]
    }
)

# If OpenAI fails, automatically tries Anthropic
response = client.chat.completions.create(
    messages=[{"role": "user", "content": "Hello!"}]
)

Load Balancing

Distribute traffic across providers:

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    config={
        "strategy": {"mode": "loadbalance"},
        "targets": [
            {"virtual_key": "openai-key-1", "weight": 0.7},
            {"virtual_key": "openai-key-2", "weight": 0.3}
        ]
    }
)

Automatic Retries

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    config={
        "retry": {
            "attempts": 3,
            "on_status_codes": [429, 500, 502, 503, 504]
        },
        "virtual_key": "openai-key"
    }
)

Semantic Caching

Reduce costs and latency with intelligent caching:

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    config={
        "cache": {
            "mode": "semantic",  # or "simple" for exact match
            "max_age": 3600      # TTL in seconds
        },
        "virtual_key": "openai-key"
    }
)

# Similar queries return cached responses
response1 = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "What is the capital of France?"}]
)

response2 = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Tell me France's capital"}]
)  # Returns cached response

Request Timeout

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    virtual_key="openai-key",
    request_timeout=30  # 30 seconds
)

Observability

Trace IDs

Link related requests for debugging:

import uuid

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    virtual_key="openai-key",
    trace_id=str(uuid.uuid4())
)

Custom Metadata

Add searchable metadata to requests:

client = Portkey(
    api_key=os.environ["PORTKEY_API_KEY"],
    virtual_key="openai-key",
    metadata={
        "user_id": "user-123",
        "session_id": "session-456",
        "environment": "production"
    }
)

Per-Request Options

response = client.with_options(
    trace_id="unique-trace-id",
    metadata={"request_type": "summarization"}
).chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Summarize this..."}]
)

Common Patterns

Multi-turn Conversation

messages = [
    {"role": "system", "content": "You are a helpful coding assistant."},
    {"role": "user", "content": "What is Python?"},
    {"role": "assistant", "content": "Python is a high-level programming language..."},
    {"role": "user", "content": "Show me a hello world example."}
]

response = client.chat.completions.create(model="gpt-4o", messages=messages)

JSON Output

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[
        {"role": "system", "content": "Extract as JSON with name and age fields."},
        {"role": "user", "content": "John is 30 years old."}
    ],
    response_format={"type": "json_object"}
)
# Returns: {"name": "John", "age": 30}

Production Setup with Fallbacks + Caching

def create_production_client():
    return Portkey(
        api_key=os.environ["PORTKEY_API_KEY"],
        config={
            "strategy": {"mode": "fallback"},
            "targets": [
                {
                    "virtual_key": os.environ["OPENAI_VIRTUAL_KEY"],
                    "override_params": {"model": "gpt-4o"},
                    "retry": {"attempts": 2, "on_status_codes": [429, 500]}
                },
                {
                    "virtual_key": os.environ["ANTHROPIC_VIRTUAL_KEY"],
                    "override_params": {"model": "claude-3-5-sonnet-20241022"}
                }
            ],
            "cache": {"mode": "semantic", "max_age": 3600}
        },
        trace_id="production-session",
        metadata={"environment": "production"}
    )

Best Practices

1. Use environment variables - Never hardcode API keys
2. Implement fallbacks - Always have backup providers for production
3. Use streaming - Better UX for long responses
4. Add tracing - Enable observability with trace IDs and metadata
5. Enable caching - Reduce costs with semantic caching
6. Handle errors - Implement retry logic with exponential backoff

Resources

• Dashboard: app.portkey.ai
• Documentation: docs.portkey.ai
• GitHub: github.com/portkey-ai/portkey-python-sdk
• Discord: portkey.ai/discord