[Python] MCP client initialisation

Please help fix my mcp client error!

I have a simple mcp server setup with streamable http.
mcp server:

mcp = FastMCP(
name="example server",
host="127.0.0.1",
port=8000
)

if __name__ == "__main__":
mcp.run(transport="streamable-http")


Also I have created a client to connect to the server.
client:

SERVER_URL = "http://127.0.0.1:8050"

async def connect_to_server(server_url: str):
async with streamablehttp_client(url=f"{server_url}") as streams:
async with ClientSession(*streams) as session:
await session.initialize()

tools = await session.list_tools()


Then I get the following error:
AttributeError("'function' object has no attribute 'total_seconds'") [single exception in ExceptionGroup]

Additional information: My pytest is setup to run the server as a sub process, then call the client like below, but I'm not convinced this is relevant.

@pytest.fixture(scope="module")
def start_mcp_server():
print("Starting mcp server as a separate process ...")
proc = subprocess.Popen(
["python", "apps/server/runtime/server.py"],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
preexec_fn=os.setsid,
cwd=BASE_DIR,
env=env,
)
try:
wait_for_server(f"{SERVER_URL}", timeout=5)
yield proc
finally:
try:
os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
except ProcessLookupError:
pass

@pytest.mark.asyncio
async def test_mcp_server_profile_and_tools(start_mcp_server):
tools, profile = await connect_to_server(SERVER_URL)

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