Python Flask app.run 不可访问，IP 未显示在终端中

Question

When I run my flask with pycharm python code run well but when it come to app.run() my terminal doesnot show any ip address it directly say unreachable code. I uninstall my python and pycharm and reinstall them the problem is same.I try with visual studio code but the error is same what can i do? enter image description here

Answer 1

Your code is close but wrong. The error is because of the indentation. You have added the debug=True to the route, it should be indented from if __name__ == '__main__' like this:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run(debug=True)

If you are curious about why you should bother with the addition of the if __name__ == '__main__': line then check out this great explanation.