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Python Flask App for File Conversion (CSV to Excel)

Build a Flask app that converts CSV files to Excel format
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Prompt
You are a Python web developer. Build a Flask application where users can upload a CSV file and download the converted Excel file. The app should: 1) Accept CSV upload, 2) Use pandas to convert, 3) Provide download link, 4) Limit file size, 5) Handle large files, 6) Add progress indicator, 7) Include tests. Provide code.

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