Programming Homework Help

Programming Homework Help. Python – Programming

There are two parts:
Part I: Steal or Deal?
You are
required to write a Python program that allows a player to play a game
of Steal or Deal against the computer. The program will allow a player
to play at most 10 games of Steal or Deal but the player can stop before
he/she has reached his/her 10 game limit. Once the player chooses to
stop playing or the player has played 10 games, the program will report
the game statistics to the screen.
Part II: Encryption
You
are required to write a Python program that performs simple encryption
and decryption on strings entered by the user. To do so, you are to use
one of the simplest and most widely known encryption techniques known as
the Caesar Cipher. The Caesar Cipher is named after Julius Caesar who
used it for private correspondence.

STAGES (PART I)

It is recommended that you
develop this part of the assignment in the suggested stages. Each stage is
worth a portion of the marks. Many problems in later stages are due to errors
in early stages.

The following stages of
development are recommended:

Stage 1

To begin, display the jackpot
to the screen and prompt for and read the player’s choice. Display the player’s
choice to the screen as seen below (the ‘C:’ stands for choice).

Sample output 1:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal

Sample output 2:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal

Make sure the program runs
correctly. Once you have that working, back up your program. Note: When
developing software, you should always have fixed points in your development
where you know your software is bug free and runs correctly.

Stage 2

Add code to generate the
computer’s choice. Use the random.choice(“sd”) or random.randint(1,2)
function to simulate the computer’s
choice. Display the computer’s choice to the screen as seen below. Don’t worry
too much about formatting the output at this stage, just make sure that the
values are correct.

Sample output 1:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Steal

Sample output 2:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Deal

Sample output 3:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Steal

Sample output 4:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal 8 of 36

Stage 3

Add code to determine whether
the player wins, loses or draws with the computer. Display the score and
appropriate message to the screen according to the following rules of play:

If both players (computer and
human) choose to make a deal to share the jackpot, the jackpot is split equally
between both players and they both receive half the money. i.e. $50 each. The
following message is displayed to the screen: Draw! Split pot!

If the human player chooses
steal the jackpot and the computer player chooses to make a deal to share the
jackpot, the human player receives all the money and the computer player who
chose to make a deal receives none. The following message is displayed to the
screen: You
win! Jackpot!

If the computer player chooses
steal the jackpot and the human player chooses to make a deal to share the
jackpot, the computer player receives all the money and the human player who
chose to make a deal receives none. The following message is displayed to the
screen: You
lose! You get nothing!

If both players (computer and
human) choose to steal the jackpot, they both receive nothing. The following
message is displayed to the screen: Too greedy! You get nothing!

Display the score and
appropriate message to the screen as seen below (the ‘S:’ stands for score):

Sample output 1:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Steal

S: 0
| 0

Too
greedy!

You
get nothing!

Sample output 2:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Deal

S:
100 | 0

You
win!

Jackpot!

Sample output 3:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal

S: 50
| 50

Draw!

Split
pot!

Sample output 4:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Steal

S: 0
| 100

You
lose!

You
get nothing!

Don’t worry too much about
formatting the output at this stage, just make sure that the values are
correct. 9 of 36

Stage 4

Now… it’s time to allow the
player to play more than one game. Let’s add a loop which loops until the user
either enters ‘q’ (to quit the game) or the 10 game limit is reached. Think
about where this code should go – what needs to be repeated, etc. Don’t worry
too much about formatting the output at this stage, just make sure that the
values are correct.

Sample output 1:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Deal

S:
100 | 0

You
win!

Jackpot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal

S: 50
| 50

Draw!

Split
pot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Steal

S: 0
| 0

Too
greedy!

You
get nothing!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal

S: 50
| 50

Draw!

Split
pot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Steal

S: 0
| 0

Too
greedy!

You
get nothing!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Steal

S: 0
| 100

You
lose!

You
get nothing!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s 10 of 36

C: Steal | Steal

S: 0
| 0

Too
greedy!

You
get nothing!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal

S: 50
| 50

Draw!

Split
pot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Deal

S:
100 | 0

You
win!

Jackpot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Steal

S: 0
| 100

You
lose!

You
get nothing!

Game
limit reached.

Sample output 2:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Deal

S:
100 | 0

You
win!

Jackpot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal

S: 50
| 50

Draw!

Split
pot!

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? q

Stage 5

Modify your code to keep a
cumulative total of the winnings of both the player and the computer player.

If both players (computer and
human) choose to make a deal to share the jackpot, the jackpot is split equally
between both players and they both receive half the money. The split jackpot
amount (i.e. $50 each) is added to a cumulative total for both players.

11 of 36

If
the human player chooses steal the jackpot and the computer player chooses to
make a deal to share the jackpot, the human player receives all the money and
the computer player who chose to make a deal receives none. The jackpot amount
is added to the cumulative total for the human player.

If
the computer player chooses steal the jackpot and the human player chooses to
make a deal to share the jackpot, the computer player receives all the money
and the human player who chose to make a deal receives none. The jackpot amount
is added to the cumulative total for the computer player.

If both players (computer and
human) choose to steal the jackpot, they both receive nothing. The cumulative
total remains unchanged.

Display the results to the
screen as seen below:

Sample output:

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Steal

S: 0
| 0

Too
greedy!

You
get nothing!

You:
0 | Computer: 0

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? s

C:
Steal | Deal

S:
100 | 0

You
win!

Jackpot!

You:
100 | Computer: 0

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Deal

S: 50
| 50

Draw!

Split
pot!

You:
150 | Computer: 50

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? d

C:
Deal | Steal

S: 0
| 100

You
lose!

You
get nothing!

You:
150 | Computer: 150

Jackpot:
100

Steal,
Deal or Quit [s|d|q]? q 12 of 36

Stage 6

Add code to keep track of how
many games were won, lost and drawn. Display this to the screen (as seen in the
sample output).

Stage 7

Add code to validate all user
input:

Would you like to play Steal or
Deal [y|n]?

Sample output:

Would
you like to play Steal or Deal [y|n]? t

Please
enter either ‘y’ or ‘n’.

Would
you like to play Steal or Deal [y|n]? y

Steal, Deal or Quit [s|d|q]?

Sample output:

Steal,
Deal or Quit [s|d|q]? e

Please
enter either ‘s’, ‘d’ or ‘q’

Steal,
Deal or Quit [s|d|q]? q

Which strategy for the computer
[1,2,3]? (you can do this in stage 8). You are not required to check for the
user entering a character/string instead of numbers in this case.

Sample output:

Which
strategy for the computer [1,2,3]? 5

Please
enter either 1, 2, or 3.

Which
strategy for the computer [1,2,3]? 3

Stage 8

Add code to prompt for and read
the strategy in which the computer player should play with. The computer player
can be set to always steal, always deal or to randomly choose between the two
(deal or steal).

Stage 9

Add code to ensure that the
user is not choosing to steal the jackpot three times in a row. If the
human
player chooses to steal the jackpot twice in a row the following warning
message is displayed to the screen: Careful… one more steal and you lose
it all! If the human player chooses to steal the jackpot three
times in a row, the following message is displayed to the screen: I told
you so… you lose all
of your winnings! In this case, the
cumulative total of the human player is set back to zero. 13 of 36

Stage 10

Modify your code so that the
players’ choices and scores are displayed to the screen in the format seen
below (and as seen in the sample output). Make sure you read the section at
the end of this assignment for help with this!

Sample Output 1 (result of game):

You |
Computer

————————–

C:
Deal | Steal

S: 0
| 0

Sample Output 2 (cumulative totals):

You |
Computer

———-
Total ———-

0 | 0

Stage 11

Add code to keep track of game
statistics. That is, how many times each player chose to steal or deal. Display
this information to the screen (as seen in the sample output). You MUST use
a list in order to store this information. You MUST also use any nested
loops in order to display this information to the screen.

Define two lists in order to
store choice stats and corresponding titles:

choice_titles
= [‘Steal’,’Deal’, ‘Comp steal’, ‘Comp deal’]

choice_counts
= [0, 0, 0, 0]

Algorithm to display the
frequency to the screen:

index
= 0

WHILE
index < length of choice_counts list

display
choice title to the screen (choice_titles[index])

FOR
number in 0 to choice_counts[index]

display
a star to the screen

increment
index by 1

Stage 12

Finally, check the sample output (see section titled ‘Sample
Output – Part I’ towards the end of this document) and if necessary, modify
your code so that:

The output produced by your
program EXACTLY adheres to the sample output provided.

Your program behaves as
described in these specs and the sample output provided.

14 of 36

PART II SPECIFICATION
– ENCRYPTION

A simple way to encrypt data is
attributed to Julius Caesar, the Roman Emperor. (If you are interested, you may
like to read the following… http://en.wikipedia.org/wiki/Caesar_cipher). This
method takes each character in a message and replaces it with one which is a
certain distance (offset) along the alphabet from it (moving right).

For example:

1 2 3
4 5 6 7 8 9 . . . . .

A B C
D E F G H I J K L M . . . +3 à

A B C
D E F G H I J . . .

If the offset is 3 then A
becomes D, B becomes E, C becomes F etc. In this case the word DIG encrypts to
GLJ. In order to decrypt the word/string, simply offset by the same amount
moving in the opposite direction (i.e. moving left).

Instead of restricting the
cipher to the alphabetic characters only, we will use all of the printable
ASCII characters. That is, all the characters from ASCII 32 (Space) to ASCII
126 (~).

Write a menu driven program called
yourEmailId_encryptor.py that will allow the user to enter commands and process
these commands until the quit command is entered.

The following commands should
be allowed:

1. Encrypt string:

Prompt for and read (from the
keyboard) a string to be encrypted. The program should then ask for the offset
value (limited to a range of 1 to 94 inclusive). Display the encrypted string
to the screen.

2. Decrypt string:

Decrypt an encrypted message by
prompting for and reading (from the keyboard) a string to be decrypted. The
program should then ask for the offset value (limited to the range of 1 to 94
inclusive). Display the decrypted string to the screen.

3. Brute force decryption:

If the offset is not known, we
can implement a brute force decryption algorithm that tries all of the 94
possible Caesar offsets in order to decrypt the encrypted text. Prompt for and
read the string to be decrypted and display all 94 possible decrypted strings
to the screen. (If you are interested, you may like to read the following…
http://en.wikipedia.org/wiki/Brute-force_attack).

4. Quit:

Quits the program displaying a
goodbye message to the screen.

Please note:

Your program must work with the
printable ASCII character set. That is, all the characters from ASCII 32
(Space) to ASCII 126 (~). When the offset points to a character beyond 126 it
should wrap around to the beginning of the set.

For Example:

If the offset is 4 and the
character is ‘}’ (ASCII 125) then it will encrypt to ASCII 129. This is beyond
126 so wrap back to the beginning by subtracting the total number of characters
(95). This gives character 34. Similarly when decrypting, if the subtracted
offset results in a number less than 32 then add 95 to the result. 15 of 36

STAGES (PART II)

It is recommended that you
develop this part of the assignment in the suggested stages. Each stage is
worth a portion of the marks. Many problems in later stages are due to errors
in early stages. Make sure you have finished and thoroughly tested each
stage before continuing.

The following stages of
development are recommended:

Stage 1

Implement the interactive mode
(prompt for and read menu commands). Set up a loop to obtain and process
commands. Test to ensure that this is working correctly before moving onto
stage 2. You need not perform any encryption/decryption of text at this point,
you may simply display an appropriate message to the screen.

Sample output:

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 1

In
command 1 – encrypt string

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 2

In
command 2 – decrypt string

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 3

In
command 3 – brute force

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 4

Goodbye.

Stage 2

Add code to implement command
1. Encrypt string.

Prompt for and read a string to
be encrypted. Prompt for and read the offset value (limited to a range of 1 to
94 inclusive). Display the encrypted string to the screen. Make sure you read
the section titled ‘Useful Built-in Python Functions’ located at the end of
this document.

Please note:

For Example:

Make sure you read the
section at the end of this assignment for help with this!

Sample output:

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3. Brute
force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 1

Please
enter string to encrypt: secret squirrel

Please
enter offset value (1 to 94): 6

Encrypted
string:

ykixkz&yw{oxxkr

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 4

Goodbye.

Stage 3

Add code to implement command
2. Decrypt string.

Prompt for and read a string to
be decrypted. Prompt for and read the offset value (limited to a range of 1 to
94 inclusive). Display the decrypted string to the screen.

Please note:

For Example:

Sample output:

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 2

Please
enter string to decrypt: ykixkz&yw{oxxkr

Please
enter offset value (1 to 94): 6

Decrypted
string:

secret
squirrel

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 4

Goodbye.

Stage 4

Add code to implement command
3. Brute force decryption.

Prompt for and read a string to
be decrypted. Display all 94 possible decrypted strings to the screen.

Please note:

For Example:

Sample output:

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 3

Please
enter string to decrypt: ykixkz&yw{oxxkr

Offset:
1 = Decrypted string: xjhwjy%xvznwwjq

Offset:
2 = Decrypted string: wigvix$wuymvvip

Offset:
3 = Decrypted string: vhfuhw#vtxluuho

Offset:
4 = Decrypted string: ugetgv”uswkttgn

Offset:
5 = Decrypted string: tfdsfu!trvjssfm

Offset:
6 = Decrypted string: secret squirrel

Offset:
7 = Decrypted string: rdbqds~rpthqqdk 19
of 36

Offset: 8 = Decrypted string: qcapcr}qosgppcj

Offset:
9 = Decrypted string: pb`obq|pnrfoobi

Offset:
10 = Decrypted string: oa_nap{omqennah

: you get the idea… 🙂

Offset:
87 = Decrypted string: “sq!s#.” $w!!sz

Offset:
88 = Decrypted string: !rp r”-!~#v ry

Offset:
89 = Decrypted string: qo~q!, }”u~~qx

Offset:
90 = Decrypted string: ~pn}p +~|!t}}pw

Offset:
91 = Decrypted string: }om|o~*}{ s||ov

Offset:
92 = Decrypted string: |nl{n})|z~r{{nu

Offset:
93 = Decrypted string: {mkzm|({y}qzzmt

Offset:
94 = Decrypted string: zljyl{‘zx|pyyls

***
Menu ***

1.
Encrypt string

2.
Decrypt string

3.
Brute force decryption

4.
Quit

What
would you like to do [1,2,3,4]? 4

Goodbye.

Stage 5

Add code to validate all user
input. Hint: use a while loop to validate input.

Menu input should also be
validated with an appropriate message being displayed if an incorrect menu
command is entered by the user.

Stage 6

Finally, check the sample
output (see section titled ‘Sample Output – Part II’ towards the end of this
document) and if necessary, modify your code so that:

The
output produced by your program EXACTLY adheres to the sample output
provided.

Your program behaves as described
in these specs and the sample output provided.

20 of 36

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