python系列（fastapi）：ERROR: Error loading ASGI app. Could not import module “main“.

ERROR: Error loading ASGI app. Could not import module "main".

• ERROR: Error loading ASGI app. Could not import module "main".

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ERROR: Error loading ASGI app. Could not import module “main”.

fastapi项目启动时，提示ERROR: Error loading ASGI app. Could not import module "main".

文件名为 f1.py

代码如下：

from fastapi import FastAPI  # 导入FastAPI


import uvicorn
app = FastAPI()  # 创建一个app实例
 
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