I created a Lambda function that calls another Lambda function and added some Python libraries. When I try to import those libraries, some are not available. How can I resolve this?

Lambda functions run in a sandbox with a limited set of pre‑installed libraries. If you need third‑party packages, you must bundle them with your deployment package or use a Lambda Layer. The typical workflow is: create a virtual environment, pip install the packages into a folder, zip the folder together with your handler code, and upload the zip to Lambda. Alternatively, you can create a Lambda Layer, upload the libraries once, and attach the layer to any function that needs them. If you’re using a container image, you can install the packages in the Dockerfile. Also ensure that the Python version you’re using in the deployment matches the one you used to install the packages. If you’re still seeing "module not found" errors, double‑check the import path and that the package name matches the one in PyPI. For example, if you’re importing pandas, the package name is "pandas", not "pandas‑data‑reader". Finally, test locally with the same runtime (e.g., python3.9) before deploying.