Update requirements.txt

requirements.txt

@@ -1,12 +1,27 @@
-# This is the correct requirements file for the new, enhanced code.
+# Enhanced Data Analysis Platform Requirements
+# Core dependencies
 streamlit==1.35.0
 pandas==2.2.2
 numpy==1.26.4
 plotly==5.22.0
+
+# Data processing
+scipy==1.13.1
+scikit-learn==1.5.0
 chardet==5.2.0
 openpyxl==3.1.2
+
+# Environment and configuration
 python-dotenv==1.0.1
+
+# Optional AI features (install if needed)
 openai==1.28.1
 google-generativeai==0.7.1
-scipy==1.13.1
-scikit-learn==1.5.0
+
+# Additional utilities for enhanced features
+xlrd==2.0.1  # For older Excel files
+xlsxwriter==3.1.9  # For Excel export with formatting
+
+# Development and testing (optional)
+pytest==7.4.4
+pytest-streamlit==0.1.0