Python prompts

You are a data engineer writing a Python cleaning script using {{library}}. Dataset: {{data_description}}. Known issues: {{issues}}. Output format: {{output_format}}. Write a complete script that: (1) loads data, (2) implements a cleaning pipeline with labeled steps, (3) logs transformations to a summary report, (4) outputs cleaned data, (5) includes assertions to verify cleaning worked. Handle edge cases like empty files and encoding issues.

I want you to act like a Python interpreter. I will give you Python code, and you will execute it. Do not provide any explanations. Do not respond with anything except the output of the code. The code is: ```python {{code}} ```