How do you iterate over float excel columns in python?

Question

Say I have an imported excel sheet that looks like this:

    A         B        C          D
4.296178, 0.434362, 0.033033, 2.758968
0.296178, 0.434362, 0.033033, 0.758968
3.396178, 0.434362, 0.033033, 1.758968

And I want to iterate through it in a way that returns the sum of each column, how would I do this?

I have tried this:

import openpyxl


    templist = []
    Col_one_total = []
    Col_two_total = []
    Col_three_total = []
    
    for row in sheet.rows:
        Col_one_total += row[0].value
        Col_two_total += row[1].value
        Col_three_total += row[2].value
        templist.append(Col_one_total)
        templist.append(Col_two_total)
        templist.append(Col_three_total)
        return max(templist)

but I keep getting an error saying TypeError: 'float' object is not iterable . Does anyone know how to resolve this?

Answer 1

I recommend using Pandas to do this. The following code reads in the Excel file using the read_excel method and the sums each column using the sum dataframe method.

import pandas as pd

df = pd.read_excel('test.xlsx')

column_sums = df.sum()

print(column_sums)

Output:

A    7.988534
B    1.303086
C    0.099099
D    5.276904
dtype: float64

Note: You need to have openpyxl installed for this to work. Else you'll run into the following error: ImportError: Missing optional dependency 'openpyxl'. Use pip or conda to install openpyxl. ImportError: Missing optional dependency 'openpyxl'. Use pip or conda to install openpyxl.