Omid - Challenge 83

data-challenges
advanced-exercises
🔰 Result Question Info A B C Date Product
Published

March 24, 2026

Illustration for Omid - Challenge 83

Challenge Description

🔰 Result Question Info A B C Date Product

Solutions

library(tidyverse)
library(readxl)

path = "files/CH-083 Custom splitter 3.xlsx"
input = read_excel(path, range = "B2:B3")
test = read_excel(path, range = "D5:F27")

result = input %>%
  separate_rows(Info, sep = ";") %>%
  separate(Info, into = c("Date","Product","Quantity"), sep = ", ") %>%
  mutate(Quantity = as.numeric(Quantity))

identical(result, test)
#> [1] TRUE

  • Logic:

    • Reads the workbook ranges needed for the challenge

    • Builds the intermediate columns that drive the final result

  • 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-083 Custom splitter 3.xlsx"
input = pd.read_excel(path, usecols="B", nrows = 1, skiprows = 1)
test = pd.read_excel(path, usecols="D:F", skiprows = 4)

result = input['Info'].str.split(';', expand=True).stack().str.split(", ", expand=True)\
    .rename(columns={0: 'Date', 1: 'Product', 2: "Quantity"}).reset_index(drop=True)
result['Quantity'] = result['Quantity'].astype('int64')

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.