Validated Python Execution for Spreadsheet Tasks

Pre-Execution Data Validation

CRITICAL: Before attempting any spreadsheet operations, validate that your source data is accessible and complete.

Step 1: Verify Data Source Availability

import os
import sys
from pathlib import Path

def validate_source_data(source_paths):
    """Validate all required data sources before processing."""
    missing = []
    inaccessible = []