🔒 I'm not able to use the Flask module even tho it's installed

[mortal forum]

I've tried evertyhing, different versions, checking enviorment, trying to run in than try it, redoing everything, changing directories, uninstalling and reinstalling it, specific versions, etc it just doesn't let me use it

[harsh marlin]

@mortal forum

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[mortal forum]

Traceback (most recent call last):
  File "/home/project/lab/server.py", line 1, in <module>
    from flask import sk
ModuleNotFoundError: No module named 'flask'```

Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: flask in /home/theia/.local/lib/python3.11/site-packages (2.2.2)
Requirement already satisfied: Werkzeug>=2.2.2 in /usr/local/lib/python3.11/dist-packages (from flask) (2.2.3)
Requirement already satisfied: Jinja2>=3.0 in /usr/local/lib/python3.11/dist-packages (from flask) (3.1.4)
Requirement already satisfied: itsdangerous>=2.0 in /usr/local/lib/python3.11/dist-packages (from flask) (2.2.0)
Requirement already satisfied: click>=8.0 in /usr/local/lib/python3.11/dist-packages (from flask) (8.1.7)
Requirement already satisfied: MarkupSafe>=2.0 in /usr/local/lib/python3.11/dist-packages (from Jinja2>=3.0->flask) (2.1.5)
[theia: lab]$ ```

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello_world():
    return"<b> my first flask application in action! </b>"```

[rich condor]

You likely have a virtual environment enabled for the project, and aren't installing into that environment

!venv

[harsh marlin]

Virtual environments

Virtual environments are isolated Python environments, which make it easier to keep your system clean and manage dependencies. By default, when activated, only libraries and scripts installed in the virtual environment are accessible, preventing cross-project dependency conflicts, and allowing easy isolation of requirements.

To create a new virtual environment, you can use the standard library venv module: python3 -m venv .venv (replace python3 with python or py on Windows)

Then, to activate the new virtual environment:

Windows (PowerShell): .venv\Scripts\Activate.ps1
or (Command Prompt): .venv\Scripts\activate.bat
MacOS / Linux (Bash): source .venv/bin/activate

Packages can then be installed to the virtual environment using pip, as normal.

For more information, take a read of the documentation. If you run code through your editor, check its documentation on how to make it use your virtual environment. For example, see the VSCode or PyCharm docs.

Tools such as poetry and pipenv can manage the creation of virtual environments as well as project dependencies, making packaging and installing your project easier.

Note: When using PowerShell in Windows, you may need to change the execution policy first. This is only required once per user:

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

[rich condor]

You need to activate the environment prior to running pip.

[mortal forum]

How do I use the virtual environment?

Pretty sure I activated it but can't find how to enter it

Okay, I tried it there as well and it still says that the flask module doesn't exist

[rich condor]

Make sure the same environment is enabled both when installing the library and running the program.

[mortal forum]

Okay, I've tried on a independed system, a virtual environment, tried running it, twice, and on visual studios codes, not a single one can even detect flask as a module, and only visual studio and the indendepended can even do "flask run"

[harsh marlin]

Python help channel closed

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