问Python uvicorn :术语“uvicorn”不被识别为cmdlet、函数、脚本文件的名称

EN

pip install uvicorn pip install uvicorn[standard]

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}

uvicorn main:app --reload


uvicorn : The term 'uvicorn' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify t
hat the path is correct and try again.
At line:1 char:1
+ uvicorn
+ ~~~~~~~
    + CategoryInfo          : ObjectNotFound: (uvicorn:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

λ pip install uvicorn
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: uvicorn in c:\users\username\appdata\roaming\python\python39\site-packages (0.12.2)
Requirement already satisfied: h11>=0.8 in c:\users\username\appdata\roaming\python\python39\site-packages (from uvicorn) (0.11.0)
Requirement already satisfied: click==7.* in c:\users\username\appdata\roaming\python\python39\site-packages (from uvicorn) (7.1.2)
WARNING: You are using pip version 20.2.3; however, version 20.2.4 is available.
You should consider upgrading via the 'c:\program files\python39\python.exe -m pip install --upgrade pip' command.