Question

convert Javascript code to Python and make sure you use chained map and filter as well.

https://book.pythontips.com/en/latest/map_filter.html

CODE BELOW IS IN JAVASCRIPT

let people = [
{name: "Amy", pounds_weight: 152, inches_height: 63},
{name: "Joe", pounds_weight: 120, inches_height: 64},
{name: "Tom", pounds_weight: 210, inches_height: 78},
{name: "Jim", pounds_weight: 180, inches_height: 68},
{name: "Jen", pounds_weight: 120, inches_height: 62},
{name: "Ann", pounds_weight: 252, inches_height: 63},
{name: "Ben", pounds_weight: 240, inches_height: 72},
];

//functions to convert pounds to kg and inches to meters
let poundstokg = (pounds)=> pounds * 0.453592;
let inchestometers = (inches)=> inches * 0.0254;

//add bmi function
let addbmi = (person) => {
person["bmi"] = poundstokg(person["pounds_weight"])/(inchestometers(person["inches_height"]) * inchestometers(person["inches_height"]));
return person;
}
//checks if the person is overweight
let isOverweight = (person) => (person["bmi"] >= 25.0 && person["bmi"] < 30);
//checks if the person is obese
let isObese = (person) => (person["bmi"] >= 30);
// array of overweight and obese people
let overweight_people = people.map(addbmi).filter(isOverweight);
let obese_people = people.map(addbmi).filter(isObese);

console.log(overweight_people);
console.log(obese_people);

Answer 1

In Python you can not chain map and filter calls.
OUTPUT:

following is the implementation of the above code in python:
CODE:

class Person:
    def __init__(self, name, weight, height, bmi=0):
        self.name = name
        # weight in pound
        self.weight = weight
        # height in inches
        self.height = height
        # initialize bmi to 0
        self.bmi = bmi

    def __str__(self):
        return "[Name: " + self.name + ", BMI: " + str(self.bmi) + "]"


def pounds_to_kg(pounds):
    return pounds * 0.453592


def inch_to_meter(inches):
    return inches * 0.0254


def bmi(person):
    return pounds_to_kg(person.weight)/pow(inch_to_meter(person.height), 2);


def add_bmi(person):
    return Person(person.name, person.weight, person.height, bmi(person))


def is_overweight(person):
    return 25.0 <= bmi(person) < 30


def is_obese(person):
    return bmi(person) >= 30


if __name__ == "__main__":
    people = [Person("Amy", 152, 63), Person("Joe", 120, 64), Person("Tom", 210, 78), Person("Jim", 180, 68), Person("Jen", 120, 62), Person("Ann", 252, 63), Person("Ben", 240, 72)]
    overweight_people = list(map(add_bmi, people))
    overweight_people = list(filter(is_overweight, overweight_people))
    print("overweight People:")
    for person in overweight_people:
        print(person)

    print("\n\nObese People:")
    obese_people = list(map(add_bmi, people))
    obese_people = list(filter(is_obese, obese_people))
    for person in obese_people:
        print(person)