回答问题

晚上好,

我正在使用 python 3.9 并尝试根据 Internethttps://www.uvicorn.org/上的文档在 Windows 10 Pro 上运行新的 FastAPI 服务我执行了以下语句

pip install uvicorn pip install uvicorn[standard]

创建示例文件 app.py

from fastapi import FastAPI

app = FastAPI()


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

但是当我运行下面的代码时:

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

我还在环境设置中添加了Python的路径

我还重新安装了 Python 3.9,并将默认安装路径设置为 c:\ProgramFiles\Python39,此路径现在也包含在系统环境和用户环境设置中。

如果我再次运行 pip install uvicorn 它会显示以下语句:

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.

非常感谢

埃里克

Answers

Python 将其脚本安装在以下路径的脚本文件夹中:c:\users\username\appdata\roaming\python\python39\scripts

将该路径放在系统和用户环境变量中。这将解决问题。