GormAnalysisPython Pandas For Your Grandpa - 3.12 Challenge: Vending Machines
Contents
Setup
You own a collection of vending machines and you want to evaluate your inventory. Given a DataFrame of (machine, product, stock), determine the number of machines carrying each product and how many of them are out of stock. In other words, build a new DataFrame with product as the row index, and calculated columns n_machines and n_machines_empty.
import numpy as np
import pandas as pd
machine_products = pd.DataFrame({
'machine': ['abc', 'abc', 'def', 'def', 'def', 'ghi'],
'product': ['skittles', 'soap', 'soap', 'm&ms', 'skittles', 'm&ms'],
'stock': [10, 0, 15, 2, 0, 3]
})
print(machine_products)
## machine product stock
## 0 abc skittles 10
## 1 abc soap 0
## 2 def soap 15
## 3 def m&ms 2
## 4 def skittles 0
## 5 ghi m&ms 3
Solution
def count_zero(x): return (x == 0).sum()
machine_products.groupby('product').agg(
n_machines = ('stock', 'count'),
n_machines_empty = ('stock', count_zero)
)
## n_machines n_machines_empty
## product
## m&ms 2 0
## skittles 2 1
## soap 2 1
Course Curriculum
- Introduction
1.1 Introduction - Series
2.1 Series Creation
2.2 Series Basic Indexing
2.3 Series Basic Operations
2.4 Series Boolean Indexing
2.5 Series Missing Values
2.6 Series Vectorization
2.7 Seriesapply()
2.8 Series View vs Copy
2.9 Challenge: Baby Names
2.10 Challenge: Bees Knees
2.11 Challenge: Car Shopping
2.12 Challenge: Price Gouging
2.13 Challenge: Fair Teams - DataFrame
3.1 DataFrame Creation
3.2 DataFrame To And From CSV
3.3 DataFrame Basic Indexing
3.4 DataFrame Basic Operations
3.5 DataFrameapply()
3.6 DataFrame View vs Copy
3.7 DataFramemerge()
3.8 DataFrame Aggregation
3.9 DataFramegroupby()
3.10 Challenge: Hobbies
3.11 Challenge: Party Time
3.12 Challenge: Vending Machines
3.13 Challenge: Cradle Robbers
3.14 Challenge: Pot Holes - Advanced
4.1 Strings
4.2 Dates And Times
4.3 Categoricals
4.4 MultiIndex
4.5 DataFrame Reshaping
4.6 Challenge: Class Transitions
4.7 Challenge: Rose Thorn
4.8 Challenge: Product Volumes
4.9 Challenge: Session Groups
4.10 Challenge: OB-GYM - Final Boss
5.1 Challenge: COVID Tracing
5.2 Challenge: Pickle
5.3 Challenge: TV Commercials
5.4 Challenge: Family IQ
5.5 Challenge: Concerts