How to find the last row in a column using openpyxl normal workbook?

Question

I’m using openpyxl to put data validation to all rows that have “Default” in them. But to do that, I need to know how many rows there are.

I know there is a way to do that if I were using Iterable workbook mode, but I also add a new sheet to the workbook and in the iterable mode that is not possible.

Asked By: human

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Source

Answer 1

ws.max_row will give you the number of rows in a worksheet.

Since version openpyxl 2.4 you can also access individual rows and columns and use their length to answer the question.

len(ws['A'])

Though it’s worth noting that for data validation for a single column Excel uses 1:1048576.

Answered By: Charlie Clark

Answer 2

Find length of row and length of col.

Column:

column=sheet['A']
output tuple-->(A1,A2,A3........An)

len(column)
output length--> 18

for row length:

for i in sheet.iter_rows(max_row=0):

    print(len(i))

    break

This will give you length of header row where you put feature name .
If you wan to get all rows length add max_row=len(column) and remove break.

Answered By: Taimoor Arif

Answer 3

This works for me well. It gives number of non empty rows in each column, assuming there are no empty rows in between.

from openpyxl import load_workbook as lw
from openpyxl.utils import get_column_letter

wb = lw(your_xlsx_file)
ws = wb[sheet_name]

for col in range(1, ws.max_column + 1):
    col_letter = get_column_letter(col)
    max_col_row = len([cell for cell in ws[col_letter] if cell.value])
    print("Column: {}, Row numbers: {}".format(col_letter, max_col_row)

Answered By: DannyG

Answer 4

Here is other solution that might be helpful – as openpyxl function max_row and max_column takes into consideration also empty cells with styles applied I think that using pandas is better in that case:

import pandas as pd

def get_max_row_column(df, sheet_name):
    max_row = 1
    max_col = 1
    for sh_name, sh_content in df.items():
        if sh_name == sheet_name:
            max_row = len(sh_content) + 1
            max_col = len(sh_content.columns)
            break
    coordinates = {'max_row': max_row, 'max_col': max_col}
return coordinates

df = pd.read_excel('xls_path', sheet_name=None)
max_row = get_max_row_column(df, 'Test_sheet')['max_row']
max_col = get_max_row_column(df, 'Test_sheet')['max_col']

By providing sheet_name=None I create dictionary of all worksheets where key is sheet name and value sheet content (which is pandas DataFrame de facto).

Answered By: Igor Rębas

How to find the last row in a column using openpyxl normal workbook?

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