Reportmissingmodulesource как исправить

Comments

PyCharm's linting (and others) complain about this specific import
as though it were an error, because the `requests.urllib3` module
is created dynamically.

But, we can just import `Retry` from `urillib3` directly, as per:
microsoft/pylance-release#597 (comment)

You will likely encounter the error message ‘Import “flask” could not be resolved from source Pylance (reportMissingModuleSource)‘ when working with Python. If you are facing the same problem, don’t worry, this article will help you overcome this problem.

How did this error occur?

The cause of this error is that the ‘flask’ module is not installed in the required environment. 

This error started appearing as soon as you used the import statement. To illustrate, you can see the example below:

As you can see, we cannot import the module ‘flask’ in this situation.

Explain more understandably: You work on your computer and install many different versions of Python for different projects. The error message tells you that ‘flask’ is not installed in the current Python environment in use.

You need to install the flask module. Here is the procedure we recommend to fix this problem:

1. First, you need to create a Virtual Environment on your terminal.
2. Use the pip install flask command to install the flask module. 
3. Use the key combination: CTRL+SHIFT+P.
4. Search “Python: Select Interpreter”.
5. Select your Virtual Environment.

Virtual Environment in Python is a virtual environment. Just like virtual machines (Virtual Machine), Virtual Environment establishes a virtual environment, allowing you to freely perform installation, removal, and installation of different versions of Python packages without fear of affecting the available projects.

To create a Virtual Environment, open the terminal in your project and the following command:

pip install virtualenv

To check if the installation of module ‘virtualenv’ has been successful, you can use the pip list command. The result will show a list of installed packages.

Now you can create a virtual environment and use that virtual environment with the following two commands:

::create a virtual environment called env
python -m venv env
 
::activate the virtual environment in your project
.envscriptsactivate

Using the key combination CTRL+SHIFT+P, search for “Python: Select Interpreter”, then select the python environment you have virtualized for your project.

Finally, run the install command for the ‘flask’ module.

pip install flask

Everything seems to be working smoothly, and the error no longer occurs.

Summary

In conclusion, the error “Import “flask” could not be resolved from source Pylance (reportMissingModuleSource)” has been solved. You must install the ‘flask’ module for the required environment before you can use it. That’s the end of this article. We hope the above information is clear and helpful to you.

Maybe you are interested:

• No module named ‘flask_restful’ in Python
• No module named ‘flask_sqlalchemy’ in Python

I was able to repro this after creating the environment and installing flask. But after I close the solution in VS and re-open it, there are no errors:

I’m thinking this is an issue with updating after the environment is changed. For example, I just manually UNINSTALLED flask from the virtual env, but I don’t see any errors in the views.py file even though there should be.

Even unloading and reloading the project doesn’t seem to update the error. But closing the solution and re-opening it does. I will look into what needs to be called to update the errors, maybe a call into the language server code.