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如何诊断和修补 python.pp.ppy 不工作
原标题:How to Diagnose and Fix python .app.py not working
I activated my virtual environment in vs code. In the PowerShell where my environment was activated, I installed Flask successfully. Then I ran this code in my file main.py: from flask import Flask app = Flask(__name__) @app.route( / ) def hello_world(): return Hello, World! if __name__ == "__main__": app.run() But when I try to run the command python .main.py in the PowerShell where my environment is activated, it displays: (venv) PS C:UsersLenovoDesktopmyprj> It doesn t give me the link to my web. I have checked the previous stack overflow question about it. The answers couldn t solve my problem. I watched a video on it, but it didn t work. I also faced problems while trying to set up my virtual environment. So I setted up this way: pip install --user virtualenv python -m virtualenv venv Set-ExecutionPolicy RemoteSigned -Scope Process venvscriptsactivate
问题回答
Your issue is in your main code. Specifically: if __name__ == "__main": This isn t the proper name. Instead, this should be "__main__". So that line should read: # ⬇️ if __name__ == "__main__": Otherwise your program will not have any output - because the name will actually be __main__. Full code: from flask import Flask app = Flask(__name__) @app.route( / ) def hello_world(): return Hello, World! if __name__ == "__main__": app.run() Also see: What does if __name__ == "__main__": do?




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