vamseeachanta Common Issues
Common Issues
1. Formula Not Calculating
# Problem: Formulas show as text, not calculated
# Solution: Ensure proper formula format
# DO: Use equals sign and proper cell references
ws['A1'] = '=SUM(B1:B10)'
# DON'T: Use string that looks like formula
# ws['A1'] = 'SUM(B1:B10)' # Missing =
# Note: Formulas are calculated when Excel opens the file
2. Large File Performance
# Problem: Memory error with large files
# Solution: Use streaming modes
# For writing
wb = Workbook(write_only=True)
# For reading
wb = load_workbook('file.xlsx', read_only=True, data_only=True)
3. Style Not Appearing
# Problem: Styles don't appear in Excel
# Solution: Ensure style is properly applied
# DO: Apply fill with fill_type
fill = PatternFill(start_color="FF0000", fill_type="solid")
# DON'T: Missing fill_type
# fill = PatternFill(start_color="FF0000") # Won't show