smiff - 1 month ago 10
Python Question

# Replace missing values in excel worksheet using openpyxl module

I’m trying to replace cells in my Excel worksheet that contains hyphen “-“ with the average value between the above lying cell and the below lying cell. I’ll been trying to do this by looping through each row in column 3

`````` import math
import openpyxl

d_filename="Snow.xlsx"

sheet_ranges=wb["PIT 1"]'

def interpolatrion_of_empty_cell():

for i in range(7,31):
if i =="-":
sheet_ranges.cell(row = i, column = 3).value = mean(i-1,i+1)
else:
sheet_ranges.cell(row = i, column = 3).value

wb.save(filename = d_filename)
``````

is this just to easy to do or is it not possible with openpyxl?

cheers//
Smiffo

The reason values are not replaced is that you use `i` to check if its equal to `-`. i is an index, not the value of a cell. Also to calculate the mean, you are using indices, not the values of top and below cells.

So you could solve this in following way:

``````def interpolatrion_of_empty_cell():
for i in range(7,31):
cell_value = sheet_ranges.cell(row=i, column=3).value
if cell_value == "-":
top_value = sheet_ranges.cell(row=i+1, column=3).value
bottom_value = sheet_ranges.cell(row=i - 1, column=3).value
sheet_ranges.cell(row=i, column=3).value = (float(top_value) + float(bottom_value))/2
``````

Not that this may require tweaking, as it does not accout for cases where tob and bottom rows are `-`, not numbers, or just empty cells.