Let's go back to the combat simulation example. We wrote code that printed an error message when the move method received invalid arguments. We will rewrite the error-handling code to use exceptions. Replace the contents of the file vehicle.py in the combatsim package with the following code:
import sage.all
class Ground_Vehicle():
"""Base class for all ground vehicles"""
def __init__(self, position):
"""Create a vehicle instance
position (x,y) tuple of coordinates
"""
# Intialize position
self._x = position[0]
self._y = position[1]
def move(self, direction, distance):
"""Move the vehicle.
Arguments:
direction floating-point number representing
the compass angle of movement in degrees. North is 0,
east is 90, south is 180, and west is 270.
0 <= direction <...