Omid - Challenge 213

data-challenges
advanced-exercises
🔰 Group Challenge 213: Custom Grouping!
Published

March 24, 2026

Illustration for Omid - Challenge 213

Challenge Description

🔰 Group Challenge 213: Custom Grouping!

Solutions

library(tidyverse)
library(readxl)

path = "files/CH-213 Custom Grouping.xlsx"
input = read_excel(path, range = "B2:C18")
test  = read_excel(path, range = "G2:H5")

result = count(input, cut(Temperature, c(-Inf, 10, 24, Inf), c("Cold", "Mild", "Hot"))) %>%
  select(Group = 1, `No Days` = 2) %>%
  mutate(Group = as.character(Group))

all.equal(result, test, check.attributes = FALSE)
#> [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-213 Custom Grouping.xlsx"
input = pd.read_excel(path, usecols="B:C", skiprows=1, nrows=16)
test = pd.read_excel(path, usecols="G:H", skiprows=1, nrows=3)

input['Group'] = pd.cut(input['Temperature'], bins=[-float('inf'), 10, 24, float('inf')], labels=['Cold', 'Mild', 'Hot'])
input['Group'] = input['Group'].astype(str)
result = input['Group'].value_counts().sort_values(ascending=True).reset_index().rename(columns={'count': 'No days'})

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.