[Python] ModuleNotFoundError: No module named 'aws_cdk'

I am trying to use aws_cdk in my project. I am using visual studio as a IDE and I setup my virtualenv doing this:

1. Install https://nodejs.org/en/.
2. Through npm, install cdk from cmd window: npm install -g aws-cdk
3. Install python3
4. Using terminal in Visual Studio Code: go to the project folder
5. Run python -m venv .venv to create the virtual env.
6. Activate it: source .venv/bin/activate
7. Run pip install: pip install -r requirements.txt
8. Run another pip install: pip install -r requirements-dev.txt.
9. Check with cdk diff in the cmd

This last step returns:

Traceback (most recent call last):
File "C:......\app.py", line 4, in <module>
import aws_cdk as cdk
ModuleNotFoundError: No module named 'aws_cdk'


My App.py looks like this:

#!/usr/bin/env python3
import os

import aws_cdk as cdk

import module_config

from myproject.myproject_stack import MyStack

app = cdk.App()

tags = module_config.with_tags(service_name="my_project")
prefix = module_config.with_prefix(service_name="my_project")
MyStack(
app,
construct_id=prefix,
prefix=prefix,
tags=tags,
env=module_config.env,
)
app.synth()


My requirements.txt looks like:

aws-cdk-lib==2.56.1
constructs>=10.0.0,<11.0.0


The requirement-dev.txt is:

bandit>=1.7.4
black>=22.10.0
coverage>=6.4.4
pylint==2.15.5
pytest
pytest-cov
yamllint
pre-commit


If in the vistual studio I do ctrl+mouse click it opens the aws-cdk code, therefore I know it is installed, but seems like the virtual env is not able to find it. In my local repository, the folder .venv has a folder Lib\site-packages and this one has another called aws_cdk.

I see everything corret, but when running the cdk diff it breaks.

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