Background
I am currently making flask-based application with Python but fatal error shown in the title occurs. I searched around the net and found similar questions but there seems be no way to resolve. So I post this issue here to receive comments and advise.
What I want to do
I want to be able to launch flask-based program.
Environment
Windows10 64bit
Python v3.10.5 (Installer was downloaded from Python.org/downloads/windows/)
flask v2.2.2
I edit all code and run program on the same computer.
Configuration
In the user environmental variables in the environment settings window(Control Panel-> Detail Information-> Detail settings of the system-> System Property-> Environmental Variables),following variables are registered:
Variable name = FLASK_APP, Value = app.py
Variable name = FLASK_DEBUG, Value = 0
Code
content inside the endpoint '/main' is almost omitted. This is because endpoint 'main' is included inside the endpoint '/'.
This is an output on command prompt.
When I start the program by typing flask run, flask replies 'Could not import app'. What is the solution to resolve this error ? I want to hear comments and advices !! Please help me !!
I am currently making flask-based application with Python but fatal error shown in the title occurs. I searched around the net and found similar questions but there seems be no way to resolve. So I post this issue here to receive comments and advise.
What I want to do
I want to be able to launch flask-based program.
Environment
Windows10 64bit
Python v3.10.5 (Installer was downloaded from Python.org/downloads/windows/)
flask v2.2.2
I edit all code and run program on the same computer.
Configuration
In the user environmental variables in the environment settings window(Control Panel-> Detail Information-> Detail settings of the system-> System Property-> Environmental Variables),following variables are registered:
Variable name = FLASK_APP, Value = app.py
Variable name = FLASK_DEBUG, Value = 0
Code
content inside the endpoint '/main' is almost omitted. This is because endpoint 'main' is included inside the endpoint '/'.
# -*- coding:utf-8 -*- from flask import Flask, render_template, url_for app = Flask(__name__) @app.route("/",methods=["POST","GET"]) def index(): username = "hogehoge" BASE_HTML=""" <!DOCTYPE html> <html lang="ja"> <head> <meta charset='utf-8'> <title>File Transfer Program</title> </head> <body> <h2 style="width:98%; background-color:LIGHTBLUE; padding-top:10px; padding-bottom:10px; padding-left:20px; margin:0 auto;">File Transfer Program</h2> <br> <div style='margin:0 auto;'> <div style='width:400px; margin:0 auto;background-color:#f1c93c;'> <table> <form action='{{ url_for("main") }}' method='POST' style='margin:10px;'> <tr style='height:30px;'> <td style='width:100px;text-align:right;'>username </td> <td style='width:250px;'><input type='text' name='username' size=30 value='"""+username+"""'></td> </tr> <tr> <td style='width:100px;text-align:right;'>password</td> <td style='width:250px;'><input type='password' name='password' size=30></td> </tr> <tr> <td colspan=2 style='text-align:center;'> <input type='submit' value='SUBMIT'> </td> </tr> </form> </table> </div> </div> </body> </html> """ os.chdir("c:\\users\\"+username+"\\documents\\python.source\\templates") with open("index.html",mode="w",encoding="utf-8") as f: f.write(BASE_HTML) return render_template("index.html") @app.route("/main",methods=["GET","POST"]) def main(): global baseFolder username = request.form["username"] password = request.form["password"] return "<h2>Hello</h2>" if __name__ == '__main__': app.run(debug=True)Error
This is an output on command prompt.
Error:C:\\users\\username\\documents > flask run
app= <Flask 'app'>
* Serving Flask app 'app.py'
* Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on http://127.0.0.1:5000
Press CTRL+C to quit
* Restarting with stat
Traceback (most recent call last):
File "C:\py64-3105\lib\site-packages\flask\cli.py", line 897, in run_command
app = info.load_app()
File "C:\py64-3105\lib\site-packages\flask\cli.py", line 308, in load_app
app = locate_app(import_name, name)
File "C:\py64-3105\lib\site-packages\flask\cli.py", line 228, in locate_app
raise NoAppException(f"Could not import {module_name!r}.") from None
flask.cli.NoAppException: Could not import 'app'.
* Debugger is active!
* Debugger PIN: 907-919-858
What is the solution to resolve this issue ?When I start the program by typing flask run, flask replies 'Could not import app'. What is the solution to resolve this error ? I want to hear comments and advices !! Please help me !!