cannot import name 'mydb' from partially initialized module 'connection' in Python

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Python 3.8 error

ImportError: cannot import name 'mydb' from partially initialized module 'connection' 
(most likely due to a circular import) (C:\U
sers\Mark04\Documents\Python tutorial\databasing\

When I tried to execute child module

import bcrypt;
from connection import mydb

That has an imported module

import mysql.connector
mydb = "Success";

I dunno what is the problem, the error doesn't appear when I remove import mysql.connector from my module but it does not solved my problem

> python -m select

This error comes when you are attempting circular import. make sure you have not created any file with the same name with that of the module you are trying to import in the directory.

Traps for the Unwary in Python's Import System — Nick Coghlan's , This has changed in Python 3.3: now any directory on sys.path with a name that "<string>", line 1, in <module> ImportError: No module named The problem is that you have a circular import: in from mod_login import mod_login in from app import app This is not permitted in Python. See Circular import dependency in Python for more info. In short, the solution are. either gather everything in one big file; delay one of the import using local import

To answer the above question, we need to understand the problem of circular dependency.

To understand the circular dependency, I want to layout a simple example, in front of you.

I think every app needs to have the few basic blocks as follows:

|    Filename    |                                        Description                                        |
|         | Creates the app and starts the server.                                                    |
|      | Define what the entity will look like (e.g, UserModel has username, email, password etc.) |
| | Fetches Data from database, generates HTML and sends the response to the user browser.    |

Our simple example will also have three files

    - ( Creates and starts the server)
    - ( Class to model a user)
    - ( We will fetch data from database, and return html to user.)

The contents of the file will look as follows:

# =============
# =============

# Define the application
app = Flask()

# Define the Database
db = SQLAlchemy(app)

# Register the Controller
from .controllers import auth_controller

The contents of the file will look as follows:

# =============
# =============

from .app import db

# We will not focus on implementation
class User(db.Model):

The contents of the file will look as follows:

# =============
# =============
from flask import Blueprint
from .models import User

# Create the auth app
auth = Blueprint('auth', __name__)

# Define the Rotues
def login():
    return "I will fetch some data and allow the user to login"

I think now, I have laid out a diagram of our app, now let's proceed to understanding how the app will work.

  1. The app starts from
  2. app variable inside the file gets created in memory.
  3. db variable inside the gets created in memory.
  4. Now, to import auth from file we switch to ````` file
  5. We import Blueprint from flask.
  6. To import User, we switch to file.
  7. Now, inside file we import db (We are able to import it because it was created in step 3)
  8. And program continues so on and so on....

The most important import step in the above sequence is step 7, becuase it will cause the problem of circular dependency in our app, in just a moment.

Now we will try to change the file to introduce the problem of circular dependency.

Now, as a developer, we might think that all our imports should be at the top of the file, doesn't it make your code cleaner. Yes, of course! it does make the code cleaner.

# ============================
#       Refactored file
# ============================
from .controllers import auth_controller

# ......
# Rest of the file is same, we only shifted this import at the top

Now, we have a problem of circular dependency in our app. Let me show you, how?

  1. Our app starts from file
  2. First, we need to import auth_controller from file
  3. Let's visit the file, and process it.
  4. From flask we import Blueprint
  5. Let's switch to file to import User
  6. Inside file, we import db from app (But db does not exist yet.)

Now, I think you got the point, The problem if just saw, was an example of circular dependency. The same problem is causing the ImportError in your case.

The solution would be to inspect the import statements and put them at the right place. Sometimes, we use code formatter, and it refactors all the import statements at the top. This might be causing the problem for you.

I hope the this may answer your question!

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The error says that it is "most likely due to a circular import". Check to make sure that in the files you are importing you are not importing the file you showed. If you are that makes a circle of importing. for example my file is and I am importing import file > import file2 > import file > import file2 > import file... Make sure that is not happening. I had the same problem as you and this fixed it.

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The order of the imports matters:


# empty file
import A
import A
import B

change the order to:

import B
import A

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I don't know the root cause, but it will work perfectly fine if you roll back to Python 3.7

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Workaround to: ImportError: cannot import name 'collections_abc , On December 11, 2019, a new version (1.23.0) of the google-cloud-bigquery library was released, which (in certain environments) breaks flake8 3.7.0+ fails with "ImportError: cannot import name 'Type'" in python 3.5.0 and 3.5.1 $ pip install flake8 I can't run flake8 --bug-report since I can't run it at all.

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  • Could it be that you have another module (or script) named mysql in your sys.path that imports either select or connection ? In all cases, there's more to it than what you posted (I just tried your code example and it doesn't exhibit this issue), so please post a proper minimal reproducible example