Final Review Dr. Bernard Chen University of Central Arkansas Spring 2012

Final Review

Dr. Bernard Chen

University of Central ArkansasSpring 2012

Outline Black Jack File I/O Module Class

Some major program skills you will use

Loop If statement Function

(So, basically, it will be a great practice on what you have learned so far om this semester)

Black Jack Game basic logics

Initiation Loop

Deliver two cards to playerPlayer’s responseDeliver two cards to house (if

necessary)House’s responseWIN or LOSE

Initiation

import random

print "Welcome to Black Jack Table!!"money=1000print "Now you have $", money, "dollars"

cards=[1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,9,9,9,9,10,10,10,10,11,11,11,11,12,12,12,12,13,13,13,13]random.shuffle(cards)

Initiation

Random Function:

random.shuffle(cards)

Initiation (print out cards)

def print_card(x): if x <10: print "-----------" print "|",x," |" print "| |" print "| |" print "| ",x," |" print "-----------" else: print "-----------" print "|",x," |" print "| |" print "| |" print "| ",x,"|" print "-----------" return

Initiation

def card_add(sum, x): if x < 10: sum+=x else: sum+=10 return sum


Initiation Loop



Loop

for i in range(10): chip_in = int(raw_input('How much money you want to play?')) player_sum=0 house_sum=0


Initiation Loop



Deliver two cards to playerPlayer’s response

if chip_in > 0 and money-chip_in >= 0: player_sum = card_add(player_sum, cards[-1]) print_card(cards.pop()) player_sum = card_add(player_sum, cards[-1]) print_card(cards.pop()) print "Your point:",player_sum


Build-in function

cards.pop()


while (int(raw_input('Do you need an extra card? (1:yes, 0:no)'))): player_sum = card_add(player_sum, cards[-1]) print_card(cards.pop()) print "Your point:",player_sum if player_sum > 21: print "You lose!!!" money-=chip_in print "Now you have $", money, "dollars" break


Initiation Loop



Deliver two cards to houseHouse’s response

If player’s point is > 21, then house does not need to play anymore (House win)

If player’s point == 21, then house does not need to play anymore (Player win)

Otherwise, house needs to play


if player_sum == 21: print "You Win!!!" money+=chip_in*2 print "Now you have $", money, "dollars"


if player_sum < 21: print "Now, it's my turn..." house_sum = card_add(house_sum, cards[-1]) print_card(cards.pop()) house_sum = card_add(house_sum, cards[-1]) print_card(cards.pop()) print "House point:",house_sum


while (house_sum < player_sum): house_sum = card_add(house_sum, cards[-1]) print_card(cards.pop()) print "House point:",house_sum


Initiation Loop



WIN or LOSE

if house_sum<=21 and house_sum >= player_sum: print "You lose!!!" money-=chip_in print "Now you have $", money, "dollars" elif house_sum > 21: print "You Win!!!" money+=chip_in print "Now you have $", money, "dollars" else: print "You Win!!!" money+=chip_in print "Now you have $", money, "dollars"


File

Files: named storage compartment on your computer that are managed by operating system

The built-in “open” function creates a Python file object, which serves as a link to a file in your computer

Read/Write file Open function take two variables, first on

is the file name you want to deal with, another one is read or write of the file

input = open ('file1.txt','r') Variable name Keyword file name read file

output = open (‘output_file.txt’, ‘w’)Variable name Keyword file name write file

Read in File1

Read File1

Write file write number form 0 to 10 into a file

output = open (‘output_file.txt’, ‘w’)for i in range(11):

output.write(str(i))output.write(‘\n’)

output.close()

Read in File3

2D list: lists inside of list Here’s the way to create a 2D list (Just like

what we saw last week)

aa=[1,2,3]bb=[4,5,6]cc=[7,8,9]

matrix=[]matrix.append(aa)matrix.append(bb)matrix.append(cc)

Read File3

input=open('file3.txt','r')

matrix=[]for line in input.readlines(): matrix.append(line.split())

Print out the average score of each studentinput=open('file3.txt','r')


for i in range(len(matrix)): sum=0 for j in range(len(matrix[i])): sum+=int(matrix[i][j]) avg=sum/len(matrix[i]) print avg

Write the average score of each student to fileinput=open('file3.txt','r')output=open('avg.txt','w')


for i in range(len(matrix)): sum=0 for j in range(len(matrix[i])): sum+=int(matrix[i][j]) avg=sum/len(matrix[i]) print avg output.write(str(avg)+'\n')

input.close()output.close()


Modules

Nodules are the highest level program organization unit, which packages program codes and data for reuse

Actually, each “file” is a module (Look into Lib in Python)

Module Creation To define a module, use your text

editor to type Python code into a text file

You may create some functions or variables in that file

You can call modules anything, but module filenames should end in .py suffix

Modules Usage

Clients can use the module file we just wrote by running “import” statement

>>> import math>>> import random>>> import module1 # assume this is

the file name we saved

Modules examples

We will create two modules: module1 and module2

module2 will import data and functions from module1

module1.py

print “First line of module1”def print_out(aa):

print aa*3

x=1y=2

module2.pyprint “First line of module2”

import module1

module1.print_out(“Hello World!! ”) # Use module1’s function

print module1.x, module1.y # Reference module1’s variable

x=10y=20

print x, y

module2 output

The result of execute this program is:

Hello World!! Hello World!! Hello World!!

1 2 10 20


What is OOP

To qualify as being truly object-oriented objects generally need to also participate in something called an inheritance hierarchy

Inheritance --- a mechanism of code customization and reuse, above and beyond anything we’ve seen so far

Class tree

Two key words need to define:1. Classes

Serve as instance factory2. Instances

Represent the product generate from classes

Class tree

Class tree

We usually call class higher in the tree (like c2 and c3) superclasses; classes lower in the tree (like c1) are known as subclasses

The search procedure (try to look up some specific function belongs to which class) proceeds bottom-up, starting from left to right

Documents

Final Review Dr. Bernard Chen University of Central Arkansas Spring 2012