CDK: Cannot find module in python project

Question

I have a CDK python project that I am trying to bootstrap.  When I run the bootstrap command `cdk bootstrap --profile ` I get the following error:

RuntimeError: Cannot find module '@aws-cdk/cx-api'

My requirements.txt shows:
```
aws-cdk-lib
constructs
aws-cdk.aws-redshift
aws_cdk.cx_api
```

Running `pip list` shows:
Package                           Version
--------------------------------- -----------
attrs                             23.2.0
aws-cdk.asset-awscli-v1           2.2.202
aws-cdk.asset-kubectl-v20         2.1.2
aws-cdk.asset-node-proxy-agent-v6 2.0.3
aws-cdk.aws-redshift              0.28.0
aws-cdk.cdk                       0.28.0
aws-cdk.cx-api                    0.28.0
aws-cdk-lib                       2.138.0
....

So it's clear to me that my python environment has aws-cdk.cx-api, but it seems the cdk cli command somehow does not have access to the module?

I'm sure this is a rookie mistake, but I'm at a loss.

Oleksii Bebych · Accepted Answer

**1. Environment Check**
First, ensure that the environment where your CDK CLI is running is the same as where your Python packages are installed. If you're using virtual environments (like venv or conda), make sure the environment is activated when running the CDK commands.

```
# Activate your virtual environment (if using one)
source /path/to/venv/bin/activate  # On Unix or macOS
.\path	o\venv\Scripts\activate    # On Windows

# Then try running the bootstrap command
cdk bootstrap --profile

```

**2. Correct Module Names in requirements.txt **
`aws-cdk.cx-api`  instead of your `aws_cdk.cx_api`
https://pypi.org/project/aws-cdk.cx-api/

**3. Environment Variables**
Sometimes, environment variables can cause issues if they point to different Python environments. Check if there are any such variables set:
```
echo $PYTHONPATH  # Unix/macOS
echo %PYTHONPATH%  # Windows
```
If PYTHONPATH is set, ensure it does not conflict with your current environment.

**4. Check CDK CLI Installation**
Ensure that your AWS CDK CLI is correctly installed and up-to-date. Sometimes, the CLI may be installed globally but needs to be aware of the local Python environment.
```
npm install -g aws-cdk
```

CDK: Cannot find module in python project

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