The Python Master by Robert Smallshire and Austin Bingham

Author:Robert Smallshire and Austin Bingham [Robert Smallshire and Austin Bingham]
Language: eng
Format: epub
Publisher: leanpub.com
Published: 2017-05-30T00:00:00+00:00

This is simple enough to use9:

>>> pluto = Planet(name='Pluto', radius_metres=1184e3, ... mass_kilograms=1.305e22, orbital_period_seconds=7816012992, ... surface_temperature_kelvin=55) >>> pluto.radius_metres 1184000.0

Unfortunately, our code also allows us to represent nonsensical situations, such as setting a negative radius, either by directly mutating an attribute, like this:

>>> pluto.radius_metres = -10000

Or by simply passing nonsense such as zero mass, negative orbital periods, or temperatures below absolute zero to the constructor:

>>> planet_x = Planet(name='X', radius_metres=10e3, mass_kilograms=0, ... orbital_period_seconds=-7293234, surface_temperature_kelvin=-5) >>> planet_x.surface_temperature_kelvin -5

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