fromflaskimportFlaskapp=Flask(__name__)if__name__=="__main__":app.run(debug=True)

Traceback (most recent call last):  File"/home/florian/tmp/flask/app.py", line3, in<module>    app= Flask(__name__)^^^^^^^^^^^^^^^  File"/home/florian/tmp/flask/src/flask/app.py", line376, in__init__    instance_path=self.auto_find_instance_path()^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File"/home/florian/tmp/flask/src/flask/app.py", line630, inauto_find_instance_path    prefix, package_path= find_package(self.import_name)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File"/home/florian/tmp/flask/src/flask/scaffold.py", line898, infind_package    package_path= _find_package_path(import_name)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File"/home/florian/tmp/flask/src/flask/scaffold.py", line858, in_find_package_path    spec= importlib.util.find_spec(root_mod_name)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File"<frozen importlib.util>", line114, infind_specValueError:__main__.__spec__ is None