## get_precedents_in_calculation(self) {#}

Gets all precedents(reference to cells in current workbook) used by this cell's formula while calculating it.


### Returns 


Enumerator to enumerate all references(ReferredArea)


```python

def get_precedents_in_calculation(self):
    ...
```


### Remarks

This method can only work with the situation that [`FormulaSettings.enable_calculation_chain`](/cells/python-net/aspose.cells/formulasettings#enable_calculation_chain)
is true for the workbook and the workbook has been fully calculated.
If this cell is not a formula or it does not reference to any other cells, null will be returned.
### Example 


```python
from aspose.cells import Workbook

workbook = Workbook()
cells = workbook.worksheets[0].cells
cells.get("A2").formula = "=IF(TRUE,B2,B1)"
workbook.settings.formula_settings.enable_calculation_chain = True
workbook.calculate_formula()
en = cells.get("A2").get_precedents_in_calculation()
print("A2's calculation precedents:")
for r in en:
    print(r)

```



### See Also
* module [`aspose.cells`](../../)
* class [`Cell`](/cells/python-net/aspose.cells/cell)