Open and Post multiple files using -with- satatement in Python

from fastapi import FastAPI
from fastapi import File, UploadFile
app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=['*'],
    allow_credentials=True,
    allow_methods=['*'],
    allow_headers=['*']
)
@app.post('/api')
def post(
    files: UploadFile = File(...)
):
    print('post')
    return dict(status='ok')

from fastapi.testclient import TestCient
testclient = TestClient(app)
files = list()
for path in files_path:
    with open(path, 'rb') as f:
        files.append('files', f.read())
res = testclient.post(/api, files=files)