User Defined Automobile Class

Goals:

Identify items in the Automobile class and first test file.

Construct the variable trace table and predict the output of the second test file.

Relevant Examples:

Pet, BankAccount, and Card Examples.

Details

Identify the following items in the Automobile class automobile.py and test file test1.py. Class Name Instance Variable Instance Method Public Member Private Member Dunder Method Constructor Local Variable Standalone Method Parameter Argument

Construct the variable trace table and predict the output from the test file test2.py. You can fill in this variable trace table:

 Local Automobile object herbie Automobile object christine Variable ======================== =========================== i model color velocity model color velocity +------+ +-----+-----+---------+ +-----+-----+---------+ | | | | | | | | | | +------+ +-----+-----+---------+ +-----+-----+---------+ | | | | | | | | | | +------+ +-----+-----+---------+ +-----+-----+---------+ | | | | | | | | | | +------+ +-----+-----+---------+ +-----+-----+---------+ You may need more than 3 rows in your table 

Also predict the output.

Automobile.py:

# automobile.py file class Automobile: def __init__(self, the_model, the_color): self.model = the_model self.color = the_color self.velocity = 0.0 def __str__(self): return f"Model: {self.color} -- Color: {self.color}" def accelerate(self): self.velocity += 15 if self.velocity > 120.0: self.velocity = 120.0 def brake(self): self.velocity -= 20 if self.velocity < 0.0: self.velocity = 0.0

 test1.py:

# Automobile Example # test1.py file from automobile import Automobile auto = Automobile("Ford Taurus", "red") print(str(auto)) # Next line has same effect as preceding line. # str method is automatically called when # an object printed. print(auto) print(auto.model, auto.color) auto.accelerate( ) auto.accelerate( ) auto.accelerate( ) print(auto.velocity) auto.brake( ) auto.brake( ) print(auto.velocity) auto.brake( ) print(auto.velocity)

 Test2.py:

from automobile import Automobile herbie = Automobile("VW Bug", "yellow") christine = Automobile("Plymouth Fury", "red") print(christine.color) herbie.color = "white" for i in range(0, 5): herbie.accelerate( ) christine.accelerate( ) print("herbie", herbie.velocity) print("christine", christine.velocity) for i in range(0, 3): herbie.brake( ) print(christine.velocity, herbie.velocity) print(herbie) print(christine)