Unable to import module 'lambda_function': No module named 'lambda_function

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The error message "Unable to import module 'lambda_function': No module named 'lambda_function'" typically occurs when AWS Lambda is unable to find the specified module or function. Here are a few steps you can take to troubleshoot and resolve this issue:

  1. Verify Module Name: Double-check that you have the correct module name specified in your Lambda function configuration. Ensure that the module name matches the actual Python file name without the file extension. For example, if your file is named lambda_function.py, the module name should be lambda_function.

  2. Check Module Location: Ensure that the Python file containing the Lambda handler function (lambda_function.py) is in the correct location. By default, AWS Lambda expects the file to be in the root directory of the deployment package or in a subdirectory with the same name as the module.

  3. Package Dependencies: If your Lambda function relies on external dependencies, make sure that you include those dependencies in your deployment package. You can use tools like pip or package managers like pipenv or poetry to manage and package the dependencies correctly.

  4. ZIP Packaging: If you are using a ZIP file to package your Lambda function, confirm that the file structure is correct. The lambda_function.py file should be at the top level of the ZIP file, not nested within any directories.

  5. Handler Function Name: Ensure that you have specified the correct handler function name in the Lambda function configuration. The handler function should be in the format module_name.function_name.

  6. Python Environment: Verify that the required Python environment is compatible with your code. AWS Lambda provides specific Python runtimes, such as Python 3.7, 3.8, or 3.9. Ensure that your code is compatible with the chosen runtime.

  7. Permissions: Check the IAM role associated with your Lambda function. Ensure that it has the necessary permissions to access any required resources or services, such as S3 buckets, DynamoDB tables, or external APIs.

By reviewing and addressing these points, you should be able to resolve the "No module named 'lambda_function'" error and successfully import the module in your Lambda function.