EECS1015-Lab 8 Objects and Classes Solved

You are to write a program that simulates the growth pattern of a colony of bacteria.   You will do this using classes and objects.  The following gives a high-level description of the types of objects that will be used, the next page gives details to the classes/objects.

Bacteria - each bacteria will have the following properties:

(1) a maximum life span

-  This is the maximum number of days a bacteria can live.

-  Note that this is not the lifespan of a bacteria, but the maximum allowable life span.

-  When you "create" a bacteria, its lifespan will be a random number between 1 and maximum life span (2) a "chance to divide" property

-  Each day your bacteria is alive, there is a probability that it will "divide" to create a new bacteria

-  When a new bacteria is created, this bacteria will have the same maximum life span and "chance to divide" (3) death

-  When a bacteria has lived its life span, it will cease living and cannot produce any new bacteria.  

Colony – a colony will have the following properties:   

(1)  The colony will start with a small number of bacteria (called the "seed")

(2)  Each day, the colony will keep track of all the new bacteria created and remove all bacteria that has died

(3)  The colony will be able to print a daily report on the current colony size, the number of new bacteria added (from existing bacteria dividing), and the number of bacteria that have died.

(4)  The colony will print a status report on the total number of bacteria that were part of the colony, the current number of bacteria still alive in the colony, and the total number of bacteria deceased.

(5)  A colony will be able to "grow" for a number of days.  It is possible that the colony will not survive if the death rate outpaces the "birth" rate.  If a colony has no more live bacteria, it will cease to grow.

Main program 

Your program should run as follows:

(1) Ask the user to input

1.     The number of days the colony is allowed to grow (i.e., how long to run the simulation)

2.     The number of bacteria to "seed" the colony (i.e., the starting number of bacteria)

3.     The maximum life span of the bacteria for this colony (number must be greater than 0)

4.     The daily "chance" that a bacteria will divide  (a number between [1-100])

[Note 3. and 4. will hold for all the bacteria in the colony.]

Based on the input from 1-4, you should create the seed bacteria.

The list of seed bacteria should be used to initialize the Colony.

For the number of days the colony is allowed to "grow", a daily output should be printed.

STOPPING EARLY: If the colony has no more bacteria (i.e., all bacteria died), then stop early.

If the colony reaches 50,000 bacteria (i.e., it becomes too big), then stop early.

Print out a final report on the bacteria with the following information:

-  Total number of days the colony was alive

-  Current colony population (i.e., the current amount that is still alive)

-  Total number of bacteria that existed (i.e., the total number of bacteria that lived)

-  Total number of bacteria that died (i.e., the total number of bacteria that died)

 

Last step:  Print out the total number of bacteria objects made.  Then, ask the user they would like to do a new simulation, if so, loop back to (1) and start again.   Create a new colony object each time.

 

CLASS/OBJECTS

Based on the description above, define your classes as follows:  I will specify the exact method names; however, you need to decide what data to use and how you want to implement the methods.

Bacteria class' methods

Methods (1) __init__(params: chance of dividing, max life span)
 

- The constructor should be implemented to keep track of the information needed for a Bacteria object. Keep in mind that the max life span is used to compute the life span of a Bacteria; it is not the life span. The life span is a random number between 1 and max life span.  When you create an "offspring" Bacteria, make sure to pass it the max life span. 

 

(2) live_a_day() - return either "None" or a Bacteria object
-  This simulates the bacteria living for "one day."

-  When this method is called, you should generate a random number between 1-100. If that random number is less than the "chance of dividing," then you should create a new bacteria object with the same "chance of dividing" and "max life span".

 

Note, calling the method live_a_day() will be counted as one day in the life of the bacteria.  If a Bacteria object's life span is 10, then if live_a_day() was called more than 10 times, the bacteria should not be able to divide anymore.

This method will return either the None keyword, (if no Bacteria was created), otherwise, you should return your newly created Bacteria. 

is_alive() - True or False
This method returns True or False.  If this bacteria can live another day (True – is alive), or has it reached the end of its life span (False – not alive).

 

Colony class' methods

__init__(param: – seed) 

A list of Bacteria objects that "seed" this colony. 

 

live_a_day(printDailyReport=True) - None
This method will simulate 1 (one) day in the life of the colony.  

This method will loop through all the Bacteria objects in the colony (stored as a list).

For each Bacteria object, its live_a_day() method should be called. Recall that a Bacteria method live_a_day() returns either a None literal or a new Bateria object.  All new Bacteria should be added to the colony's list of live bacteria.  After you call live_a_day(), you should check if the bacteria object is still alive.  If it is not, then you should remove it from the colony.

If you use a list to store your colony, you can use the "remove()" method to remove any item from a list.  

 

When the Colony's live_a_day() method is called, you should also print out a daily report using the following formatted string:

"Day %5d  Colony Size %6d New Members %6d Expired Members %6d" 

The "%Xd" ensures that each printed item has X characters. This will make the formatting much easier to read. 

print_colony_status() - None
This method prints out a more detailed output than the daily output did. See description in "Task" and example below from the actual output.   

 

get_colony_size()  
Returns the size of the colony (i.e., how many bacteria are currently alive)

SAMPLE OUTPUT 

 

Max num of days to let the colony grow: 100 

Number of starting bacteria: 5 

% chance of daily division [1-100]: 25 

Maximum lifespan for a bacteria (1 or greater): 5 

Day     1  Colony Size      5 New Members      1 Expired Members      1 

Day     2  Colony Size      5 New Members      1 Expired Members      1 

Day     3  Colony Size      8 New Members      3 Expired Members      0 

Day     4  Colony Size      4 New Members      2 Expired Members      6 

Day     5  Colony Size      6 New Members      2 Expired Members      0 

Day     6  Colony Size      6 New Members      2 Expired Members      2 

Day     7  Colony Size      8 New Members      3 Expired Members      1 

Day     8  Colony Size      6 New Members      2 Expired Members      4 

Day     9  Colony Size      7 New Members      3 Expired Members      2 

Day    10  Colony Size     11 New Members      4 Expired Members      0 

Day    11  Colony Size      5 New Members      0 Expired Members      6 

Day    12  Colony Size      6 New Members      1 Expired Members      0 

Day    13  Colony Size      4 New Members      1 Expired Members      3 

Day    14  Colony Size      4 New Members      2 Expired Members      2 

Day    15  Colony Size      3 New Members      0 Expired Members      1 

Day    16  Colony Size      2 New Members      1 Expired Members      2 

Day    17  Colony Size      3 New Members      1 Expired Members      0 

Day    18  Colony Size      2 New Members      0 Expired Members      1 

Day    19  Colony Size      2 New Members      1 Expired Members      1 

Day    20  Colony Size      2 New Members      0 Expired Members      0 Day    21  Colony Size      0 New Members      0 Expired Members      2 

Experiment Stopped 

Colony report at DAY 21  

Current colony population 0  

Total number of bacteria   35  

Total deceased bacteria    35  

 

Total number of Bateria objects created so far 35 

Try another experiment? (Y/N) y 

Max num of days to let colony grow: 20 

Number of starting bacteria: 5 

% chance of daily division [1-100]: 50 

Maximum lifespan for a bacteria (1 or greater): 5 

Day     1  Colony Size      9 New Members      5 Expired Members      1 

Day     2  Colony Size     11 New Members      5 Expired Members      3 

Day     3  Colony Size     15 New Members      5 Expired Members      1 

Day     4  Colony Size     15 New Members      6 Expired Members      6 

Day     5  Colony Size     17 New Members      8 Expired Members      6 

Day     6  Colony Size     19 New Members      6 Expired Members      4 

Day     7  Colony Size     22 New Members     10 Expired Members      7 

Day     8  Colony Size     18 New Members      7 Expired Members     11 

Day     9  Colony Size     24 New Members     13 Expired Members      7 

Day    10  Colony Size     30 New Members     14 Expired Members      8 

Day    11  Colony Size     36 New Members     16 Expired Members     10 

Day    12  Colony Size     40 New Members     16 Expired Members     12 

Day    13  Colony Size     56 New Members     22 Expired Members      6 

Day    14  Colony Size     66 New Members     25 Expired Members     15 

Day    15  Colony Size     78 New Members     32 Expired Members     20 

Day    16  Colony Size     92 New Members     37 Expired Members     23 

Day    17  Colony Size    117 New Members     48 Expired Members     23 

Day    18  Colony Size    138 New Members     63 Expired Members     42 

Day    19  Colony Size    169 New Members     64 Expired Members     33 

Day    20  Colony Size    207 New Members     91 Expired Members     53 

Experiment Stopped 

Colony report at DAY 20  

Current colony population 207  

Total number of bacteria   498  

Total deceased bacteria    291  

 

Total number of Bateria objects created so far 533 

Try another experiment? (Y/N)