Write a Python program to simulate an ecosystem containing two types of animals, bears and fish.

The ecosystem consists of a river, which is modeled as a relatively large list.

Each element of the list should be a Bear object, a Fish object, or None.

In each time step of the simulation, in order, process each animal decision.

Based on a random process, each animal either attempts to move (e.g., option 0) into an adjacent list location or stay where it is (e.g., option 1).

If two animals of the same type are about to collide in the same cell, then they stay where they are, but they create a new instance of that type of animal, which is placed in a random empty (i.e., previously None) location in the list (i.e., river).

If a bear and a fish collide, however, then the fish dies (i.e., it gets removed from the list) and the bear does not move. If the bear, while moving, collides with a fish, the bear eats the fish at the fish location.

If the animal is at the end of the river and it decides to move, then the animal gets out of the river.

You need to create a parent class Animal, and subclasses for the Bear and Fish.

Initial class skeletons are provided to you. You need to use those skeletons to complete the missing code.

Similarly, you need to work on a class for the Ecosystem that will simulate this scenario. The skeleton for the class is provided to you. You need to complete the missing code.

Every animal has a location and a name that are initialized in the constructor.

Similarly, every animal has at least the following methods:

_move(): to set the new location for the animal

_get_location(): to return its location

__str__() : method to print the type of animal and its current location

get_class_name(): to return the class name

speak(): Allows the animal to speak

You can have other helper methods for this class (although not necessary).

The data and methods are inherited by all animals.

The animal subclasses, Bear and Fish, only assign the animal type (i.e., name) to each new animal.

Animals can speak. However, only the bears can say a different thing. See the examples below.

You need a class representing the Ecosystem.

This class will need to have a constructor to initialize the Ecosystem.

The constructor needs to initialize an empty river and randomly place animals into the river. The size of the initial river is a parameter for the creation of the object.

To initialize this random ecosystem, the constructor calls the method initialize_random_ecosystem().

In this method you need to:

1) initialize a random number of Bears and place a Bear object in a random empty position in the river. You can generate between 1 to 4 bears.

2) initialize a random number of Fish and place a Fish object in a random empty position in the river. You can generate between 1 to 4 Fish.

Use a river size that is larger than the probable number of animals. For example, you could have 4 Bears and 4 Fish, therefore your river size should be larger than 8 positions.

For the simulation, you need to complete the simulate() method.

This method receives a parameter for the number of iterations for traversing the river. This is a parameter passed by the user.

This method is the responsible of simulating the scenario described above for the animals behaviour.

Similarly, this method calls a method animal_creation(), if that is required by the animal scenario. This method receives an animal as parameter, and it creates a new animal of the same type as the received animal. Also, this method needs to assign the new animal randomly in a free space in the river.

////animal.py

def __init__(self):

"""

Constructor for the animal.

Every animal has a location and name

"""

pass

def __str__(self):

"""Method used to print the name o the animal and its location

"""

pass

def _move(self, new_location):

""" Method to set the new location

"""

pass

def _get_location(self):

""" Method to return the location

"""

pass

def get_class_name(self):

""" Method to return the class name

"""

pass

def speak(self):

"""Method that allows the animal to speak

"""

print("\tIt says: *Silence...*")

//fish.py

from Animal import Animal

class Fish(Animal):

def __init__(self) -> None:

"""Constructor for the Fish

This constructor initializes the features of the parent class

Assigns "Fish" as the name of the animal

"""

pass

//bear.py

from Animal import Animal

class Bear(Animal):

def __init__(self):

"""Constructor for the Bear

This constructor initializes the features of the parent class

Assigns "Bear" as the name of the animal

"""

pass

def speak(self):

print("\tIt says: I am eating!")

//simulation.py

import random

from Animal import Animal

from Bear import Bear

from Fish import Fish

random.seed(42) # Change this number for your different tests.

class Ecosystem():

def __init__(self, size):

""" Constructor for the Ecosystem

It initializes the river (a list with a given size)

It calls the method to initialize the river with animals in random places

"""

# Remove pass and write your code here

pass

self.initialize_random_ecosystem()

def initialize_random_ecosystem(self):

""" Method to randomly initialize the ecosystem

Randomly picks a number between 1 and 4 to decide the number of Bears

Randomly places the Bears in the river in empty positions

Randomly picks a number between 1 and 4 to decide the number of Fish

Randomly places the Fish in the river in empty positions

"""

# Remove pass and write your code here

pass

def animal_creation(self, type_of_animal):

"""Method to create a new type of animal when two animals of the same type collides

The new created animal is placed randomly in the river in any empty position

"""

# Remove pass and write your code here

pass

def show(self):

"""Method to show each position in the river and the animal each position contains

"""

# Remove pass and write your code here

pass

def simulate(self, iterations):

"""Method to simulate the Ecosystem movement

It similates the ecosystem live depending on the number of iterations passe as argument

In each iteration, it processes in order each animal

It randomly picks an action (0=move, 1=stay)

It moves the animal and do all the similation as defined in the scenario.

It checks if the next position is empty to move the animal

If the position is not empty, then it checks what type of animal is in the next position

It decides what action to perform based on the type of animal in the next position

"""

print("~~~ Initializing the Simulation ~~~")

# Write your code here

def create_new_animal(self, a):

"""Optional Method

You can optionally use this method to get the animal's class name

before you use the method animal_creation()

"""

# Remove pass and Write your code here

pass

//ecosystem_tester.py

if __name__ == "__main__":

print(" Initializing Ecosystem")

e = Ecosystem(10)

print(" Ecosystem BEFORE simulation")

e.show()

print(" TESTING")

e.simulate(1)

print(" Ecosystem AFTER simulation")

e.show()

output example

This example shows the simulation for one iteration. The river size is 10.

Initializing Ecosystem Initial number of bears: 1 Initial number of fish: 3 Bear assigned to position 8 Fish assigned to position 5 Fish assigned to position 1 Fish assigned to position 7 Ecosystem BEFORE simulation None Fish at location 1 None None None Fish at location 5 None Fish at location 7 Bear at location 8

none

Processing Animal at location 1 Animal chose to 1 Stay Processing Animal at location 5 Animal chose to 1 Stay Processing Animal at location 7 Animal chose to 0 Move Fish at location 7 to 8 Processing Animal at location 8 Animal chose to 1 Stay Ecosystem AFTER simulation None Fish at location 1 None None None Fish at location 5 None None Bear at location 8 None