Omid - Challenge 131

data-challenges
advanced-exercises
🔰 Table Transformation!
Published

March 24, 2026

Illustration for Omid - Challenge 131

Challenge Description

🔰 Table Transformation!

Solutions

library(tidyverse)
library(readxl)

path = "files/CH-131 Table Transformation.xlsx"
input = read_excel(path, range = "C2:I7")
test  = read_excel(path, range = "K2:N12")

result = bind_rows(input[,1:4], input[,c(1,5:7)]) 

all.equal(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-131 Table Transformation.xlsx"
input = pd.read_excel(path, usecols="C:I", skiprows=1, nrows=5).rename(columns=lambda x: x.replace('.1', ''))
test = pd.read_excel(path, usecols="K:N", skiprows=1, nrows=11).rename(columns=lambda x: x.replace('.1', '').replace('.2', ''))

result = pd.concat([input.iloc[:, :4], input.iloc[:, [0, 4, 5, 6]]], axis=0).reset_index(drop=True)

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.