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---
name: openpyxl-common-issues
description: 'Sub-skill of openpyxl: Common Issues.'
version: 1.0.0
category: data
type: reference
scripts_exempt: true
---
# Common Issues
## Common Issues
#### 1. Formula Not Calculating
```python
# 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
```python
# 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
```python
# 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
```
