错误：没有名为“__main__.forms”的模块； '__main__' 不是 Python3 中的包

Question

I am building a web app using Flask in Python. I have my main file named: flaskblog.py and it has following code:

from flask import Flask, render_template

app = Flask(__name__)

** # I have some code here****


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

above code worked fine and gave desired output, I have only one .py file as of here.

Now I have created a new .py file named: forms.py which has classes RegistrationForm and LoginForm and I tried to import these classes into flaskblog.py file, code is below,

from flask import Flask, render_template
from .forms import RegistrationForm, LoginForm

app = Flask(__name__)

    ** # I have some code here****


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

the above code is giving me error:

ModuleNotFoundError: No module named ' main .forms'; ' main ' is not a package

I am new to promgramming and thinking some changes need to be done in if __name__ == '__main__': but not able to figure it out. can anyone assist please?

Answer 1

and welcome to SO. First I would recommend reading this link: https://realpython.com/python-modules-packages/ since it explains how Python modules and packages are working.

You should be able to solve the from if you change:

from .forms import RegistrationForm, LoginForm

to:

from forms import RegistrationForm, LoginForm