MYAPP/
run.py
imported_module1.py
imported_module2.py
imported_module3.py
imported_module4.py
main_module.py

import main_module

app = Flask(__name__)

@app.route('/')
def dynamic_page():
    return main_module.main()

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

[2019-05-19 14:57:00,338] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "run.py", line 8, in dynamic_page
    return main_module.main()
TypeError: main() missing 1 required positional argument: 'argv'
127.0.0.1 - - [19/May/2019 14:57:00] "GET / HTTP/1.1" 500 -