kinetic_energy.py

#!/usr/bin/env python
# coding: utf-8

"""Calculates kinetic energy for a moving object at a given mass and speed"""

import locale
locale.setlocale(locale.LC_ALL, '')

objects = (
    {'name': 'Bicycle', 'mass': 100,},
    {'name': 'Subcompact Car', 'mass': 1200,},
    {'name': 'Sedan/Compact SUV', 'mass': 1600,},
    {'name': 'SUV/Truck', 'mass': 2500,},
)

speeds = (25, 50, 75, 100)

border   = '--------------------------------------------------------------------'
header   = 'Vehicle            Mass (kg)  Speed (km/h)  Speed (m/s)  KE (Joules)'
template = '%17s %9s %14s %13s %11s'

def convert_speed(speed):
    """Converts a speed in km/h to m/s"""
    return speed*1000.0/3600

def kinetic_energy(mass, speed):
    """Returns the kinetic energy of a moving object"""
    return mass*0.5*(speed**2)

if __name__ == '__main__':
    print(border)
    print(header)
    print(border)
    for obj in objects:
        name = obj['name']
        mass = obj['mass']
        for speed in speeds:
            ms_speed = convert_speed(speed)
            KE = kinetic_energy(mass, ms_speed)
            print(template % (
                name,
                locale.format('%d', mass, grouping=True),
                speed,
                round(ms_speed,1),
                locale.format('%d', int(round(KE,0)), grouping=True),
                )
            )
        print(border)