Omid - Challenge 79

data-challenges
advanced-exercises
🔰 Question Result Column 1 Column 2 Column 3 Column 4 Column 5 Column 6
Published

March 24, 2026

Illustration for Omid - Challenge 79

Challenge Description

🔰 Question Result Column 1 Column 2 Column 3 Column 4 Column 5 Column 6

Solutions

library(tidyverse)
library(readxl)

path = "files/CH-079 Remove Blank Columns.xlsx"
input = read_excel(path, range = "B2:I6")
test  = read_excel(path, range = "K2:N6")

result = input %>%
  select(-where(~all(is.na(.))))

identical(result, test)
# [1] TRUE

  • Logic:

    • Reads the workbook ranges needed for the challenge

  • Strengths:

    • The R solution stays close to the workbook rule and keeps the transformation compact.

  • Areas for Improvement:

    • The code assumes the sheet structure and source ranges remain stable.

  • Gem:

    • The strongest part of the solution is choosing the right intermediate representation before shaping the final output.
import pandas as pd

path = "CH-079 Remove Blank Columns.xlsx"

input = pd.read_excel(path, usecols="B:I", skiprows=1)
test  = pd.read_excel(path, usecols="K:N", skiprows=1)
test.columns = test.columns.str.replace('.1', '')

result = input.loc[:, input.columns[~input.isnull().all()]]
print(result.equals(test)) # True

  • Logic:

    • Reads the workbook ranges needed for the challenge

  • Strengths:

    • The Python version follows the same rule in a direct dataframe-oriented implementation.

  • Areas for Improvement:

    • The code assumes the workbook layout remains stable, so any sheet redesign would require small adjustments.

  • Gem:

    • The implementation stays close to the original workbook rule instead of adding unnecessary abstraction.

Difficulty Level

This task is moderate:

  • The business rule is readable, but the workbook still requires careful implementation to reach the expected layout.