Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 5

Python
1

Tell us what’s happening:

I keep getting the error message “The string representation for Projectile(45, 45, 45) should be correct.”
My Projectile (45,45,45) returns 244.4 m. Isn’t that the correct displacement? I added newlines at the beginning and end, had displacement to one decimal place but still get the same error message.
Can someone point me in the right direction please.

Your code so far

import math

GRAVITATIONAL_ACCELERATION = 9.81
PROJECTILE = "∙"
x_axis_tick = "T"
y_axis_tick = "⊣"

class Projectile:
    __slots__ = ('__speed', '__height', '__angle')

    def __init__(self, speed, height, angle):
        self.__speed = speed
        self.__height = height
        self.__angle = math.radians(angle)


    def __calculate_displacement(self):
        horizontal_component = self.__speed * math.cos(self.__angle)
        vertical_component = self.__speed * math.sin(self.__angle)
        squared_component = vertical_component**2
        gh_component = 2 * GRAVITATIONAL_ACCELERATION * self.__height
        sqrt_component = math.sqrt(squared_component + gh_component)
        
        return horizontal_component * (vertical_component + sqrt_component) / GRAVITATIONAL_ACCELERATION
        

# User Editable Region

    def __str__(self):
        displacement = self.__calculate_displacement()
        return (f'\nProjectile details:\n' 
                f'\nspeed: {self.__speed} m/s\n' 
                f'\nheight: {self.__height} m\n' 
                f'\nangle: {int(math.degrees(self.__angle))}°\n' 
                f'\ndisplacement: {displacement:.1f} m\n')
ball = Projectile(10, 3, 45)
print(ball)

# User Editable Region

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Challenge Information:

Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 5

2

why do you have an empty line between each characteristic?

3

Thanks a lot. You made my day! :clap: