File operations, lists, and dictionaries

BBM103: Introduction to Programming Laboratory I 
PROGRAMMING ASSIGNMENT 3
Click here to accept your Programming Assignment 3.
Figure 1: Overview of the S¸¨ukr¨u Sara¸co˘glu Stadium
1 Assignment
In this assignment, you will get familiar with file operations, lists, and dictionaries while you
implement a real-world Football ticketing system. Furthermore, you will have hands-on experience designing required data structures to store related data for categories and seats in the
S¸¨ukr¨u Sara¸co˘glu Stadium while you do some operations such as selling or canceling tickets. As
can be seen in Figure 1, seats for football fans consist of categories and ticket transactions are
made through these categories. There are two type of category as category-1 (i.e., Marathon
tribune) and category-2 (i.e., back-goal tribune). Each category (e.g., category-1) can be
divided into more than one category (e.g., category-1A, category-1B, etc.) in itself.
You will be supposed to design and implement a console-based basic Football ticketing system
Programming Assignment 3 1
BBM103: Introduction to Programming Laboratory I (Fall 2022)
that reads an input file as an argument line by line and executes each line contains a command
and its arguments. The name of the input file will be fixed as ”input.txt” and it will be
inside the folder where your python file is located. A list of available commands is given in
Section 3. In our stadium, arbitrary number of categories can be created with a rectangular
layout having the columns named with a sequence of 0, 1, 2, 3, ... while its rows are named
with the characters of the English alphabet (A, B, C, ...., Z). In Figure 2, this scheme has
been illustrated. As shown the figure, the side of each category facing the football
ground will be the columns and the other side will be the rows. As a result, the
number of rows of any category is limited to 26. In our stadium, you should apply three types
of fares for each seat (i.e. student, full pay or season ticket). According to these tariffs, the
price of student and full fare tickets will be 10 and 20 dollars, respectively. The price of a
season ticket will be 250 dollars. In the following sections, you will find the descriptions of the
commands and their arguments. Before delving into details please note that your program
must output the results of the operations to both a console and a text file. The name of the
output file will be fixed as ”output.txt” and it must be created in the same folder where
your python file exists.
Figure 2: A sample category with its rows and columns
2 Commands
You are supposed to write a Python program to read an input file and execute commands
inside of it. The name of the input file must be accepted as an argument by your program.
The name of your program must be ”assignment3.py”. The input files will reside in the
directory your python file exists. A list of the commands is given in the following table, and
their details are given in the following sub-sections.
Programming Assignment 3 2
BBM103: Introduction to Programming Laboratory I (Fall 2022)
2.1 CREATECATEGORY
This command expects two arguments to create a free category. Initially, all the seats must
set to free. The syntax of the command is given below:
CREATECATEGORY categoryname number of rowsXnumber of columns
Example command:
CREATECATEGORY category-1D 20x15
To this end, when you read such a line you must create a category which will be called
”category-1D” and has 20 rows and 15 columns resulting in 300 total seats. If the operation
is successfully carried out, you must output a success prompt like below:
The category ’category-1D’ having 300 seats has been created
As shown in Figure 1, the category names are unique. However, note that, once the category
is defined it will be no more possible to redefine it. So, your program must output an error
message if you come across another ”CREATECATEGORY” command involving the same
name you have already assigned. The example error message is presented below:
Warning: Cannot create the category for the second time. The stadium
has already category-1D.
2.2 SELLTICKET
The command ”SELLTICKET” enables you to sell tickets. This command fundamentally
takes four arguments. However, it may take an arbitrary number of arguments for multiple
seats or seat ranges. The basic syntax is given below:
SELLTICKET customer_name full|student|season category_name seat*
As can be seen, the first argument indicates the customer name whereas the second one
identifies the payment type. As told before, tickets are categorized into 3 groups which are
either ”seasons”, ”full” or ”student”. The third argument stands for the target category name
in which the seat or seats will be purchased. The last argument (may have more than one)
specifies the seat (e.g. B13), seats (e.g. B13 B14 A20 C2), or seat ranges (e.g. D2-15). Thus,
you must deal with a variational number of command arguments and process each of them
separately. Some command examples are given below:
SELLTICKET hagi full category-1D B12
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BBM103: Introduction to Programming Laboratory I (Fall 2022)
SELLTICKET alex student category-1D B12 C3 B5 D4
SELLTICKET maria student category-1E C2-4 D7 A6
SELLTICKET nihat full category-1E C3-15
SELLTICKET neslihan student category-1D D7-32
Note that, your input file will involve lots of ”SELLTICKET” commands each having a
unique customer name. At this point, your algorithm must handle all command arguments
separately and check whether the respective seat or seat ranges are available to sell. As a rule,
any command argument indicating an individual seat (e.g. B12) should be checked for its
availability whereas all the seats in a range must be completely checked before their purchase.
In other words, you cannot sell a seat range even one of the seats in it is not available. As
a result, the output of each ”SELLTICKET” command involves one or more than one lines
each indicating the result of each seat or seat range. Meanwhile, you must also check the
category name and number of command arguments against any exceptional case. Moreover,
seat ranges or individual seats may exceed the category sizes. For instance, if the seat label
(e.g. C30) does not exist in the related target category, your program must create a warning
for that operation. Some example output lines are given below with respect to the example
commands above:
Success: hagi has bought B12 at category-1D
Warning: The seat B12 cannot be sold to alex since it was already sold!
Success: alex has bought C3 at category-1D
Success: alex has bought B5 at category-1D
Success: alex has bought D4 at category-1D
Success: maria has bought C2-4 at category-1E
Success: maria has bought D7 at category-1E
Success: maria has bought A6 at category-1E
Error: The seats C3-15 cannot be sold to nihat due some of them have
already been sold!
Error: The category ’category-1D’ has less column than the specified
index D7-32!
2.3 CANCELTICKET
The command ”CANCELTICKET” enables you to cancel some purchases. It has a varying
number of arguments such as ”SELLTICKET”. The basic syntax of the command is given
below:
CANCELTICKET category_name seat*
Similar to the ”SELLTICKET” command, it takes an arbitrary number of command arguments and tries to cancel the operation and revert the status of each seat to which each
argument points. Unlike ”SELLTICKET”, the last argument (may have more than one)
Programming Assignment 3 4
BBM103: Introduction to Programming Laboratory I (Fall 2022)
specifies the seat (e.g. B13) or seats (e.g. B13 B14 A20 C2), but not specifies the seat ranges
(e.g., D2-15). The same exceptional cases hold for ”SELLTICKET” also exist for ”CANCELTICKET”. Furthermore, if the command argument points to any seat which has never
been sold, you must output a warning. Some example commands and their respective outputs
are given in an ordered way below:
CANCELTICKET category-1D B12
CANCELTICKET category-1E C3 B5
CANCELTICKET category-1F E33
CANCELTICKET category-1D G45
Output:
Success: The seat B12 at ’category-1D’ has been canceled and now ready
to sell again
Success: The seats C3 at ’category-1E’ have been canceled and now ready
to sell again
Error: The seat B5 at ’category-1E’ has already been free! Nothing
to cancel
Error: The category ’category-1F’ has less column than the specified
index D33!
Error: The category ’category-1F’ has less column than the specified
index G45
2.4 BALANCE
The command ”BALANCE” is used to get a balance report of any category with its revenues.
The command takes only the category names as arguments. The syntax of the command is
given below:
BALANCE category_name
According to this definition some examples are listed below:
BALANCE category-1D
When your program executes this command it must first parse the command line and list
the balance information involving student, full pay, season ticket and overall revenues. An
example output is presented below:
Category report of ’category-1D’
--------------------------------
Sum of students = 5, Sum of full pay = 10, Sum of season ticket=2, and
Revenues = 750 Dollars
As you may observe, the line below the first line has the same string length as the header line
of the command output.
Programming Assignment 3 5
BBM103: Introduction to Programming Laboratory I (Fall 2022)
2.5 SHOWCATEGORY
The ”SHOWCATEGORY” command is used to visualize the current layout of the categories
with their seats and their actual status. The command takes only one argument which is the
category name. An instance of the command is given below:
SHOWCATEGORY category-1D
In this example output you see the category layout according to a category named ”category1D”. Assume that this category has 10 rows and 10 columns. As can be seen, the rows are
labeled with letters of the English alphabet, and they are ordered in descending fashion (i.e.
O, N, M, L, ...., A). Likewise, the columns must be placed one after another having 2 white
space character. The columns must be started from 0 to the count of the last column. In this
visualization, the empty seats (X) are illustrated with the character of ’X’ while the seats
sold for students (S), full pay (F), and season tickets (T) can be shown with ’S’, ’F’, and ’T’
respectively.
Printing category layout of category-1D
J X X S X X S X X X G
I X X G X X X G X X G
H X X X X X X S X X G
G X X X X X X G X X X
F X X X T X S S X X X
E X X X X X X G X X X
D X X X X X T G X X X
C X X X X G X X X X X
B X X X G X X X X X X
A X X X X X X X X X X
0 1 2 3 4 5 6 7 8 9
You should keep in mind that your output must be formed and listed exactly the same as the
example given above.
3 Grading Policy
Task Point
Submit 1
Clean code 10
Coding standard 5
Output 84
Total 100
4 Important Notes
• Compile your code on dev.cs.hacettepe.edu.tr before submitting your work to
make sure it compiles without any problems on our DEV server.
Programming Assignment 3 6
BBM103: Introduction to Programming Laboratory I (Fall 2022)
• The assignment must be original, individual work. Downloaded or modified source codes
will be considered cheating. Also, the students who share their work will be punished
in the same way.
• We will be using a software similarity program to identify the cases of possible plagiarism. Our department takes the act of plagiarism very seriously. Those caught
plagiarizing (both originators and copiers) will be sanctioned.
• In the ”Coding style” of the grading policy section, it will be taken into account
whether unnecessary code fragments are used whether the abstraction level is regular,
and whether your code is understandable.
• In the ”Coding standard” of the grading policy section, it will be taken into account
whether variable names or function names are used in the correct format.
• You can ask your questions through the course’s piazza group and you are supposed to
be aware of everything discussed in the piazza group. General discussion of the problem
is allowed, but DO NOT SHARE answers, algorithms, source codes, and reports.
• Execute your code on the DEV server using the following command in terminal:
python3 assignment3.py input.txt
• Don’t forget to write comments on your codes when necessary.
• Save all work until the assignment is graded.
• Do not miss the deadline.
• You must submit your work with the file hierarchy as stated below:
assignment3.py
Programming Assignment 3 7