How do you implement streaming responses in the Gemini API?

from google import genai

client = genai.Client()

# Method 1: generateContent with stream=True
for chunk in client.models.generate_content_stream(
    model="gemini-3.5-flash",
    contents="Write a comprehensive guide to Python async programming.",
):
    print(chunk.text, end="", flush=True)  # prints each chunk as it arrives
print()  # final newline

# Method 2: Interactions API with stream=True
for chunk in client.interactions.create(
    model="gemini-3.5-flash",
    input="Explain the history of computer science.",
    stream=True,
):
    if chunk.output_text:
        print(chunk.output_text, end="", flush=True)

# Async streaming (for FastAPI, async web apps):
async def stream_async():
    async for chunk in await client.aio.models.generate_content_stream(
        model="gemini-3.5-flash",
        contents="Async streaming example.",
    ):
        print(chunk.text, end="", flush=True)
        yield chunk.text  # yield to web framework (SSE, WebSocket)