FIT9136 Algorithm and
programming foundation in
Python
Assignment 3
Lecturer in Charge: Shirin Ghaffarian Maghool
May 2022
Table of Contents
1. Key Information 3
1.1. Do and Do NOT 4
1.2. Documentation 4
1.3. Submission 4
2. Getting help 6
2.1. English language skills 6
2.2. Study skills 6
2.3. Things are tough right now 6
2.4. Things in the unit don’t make sense 6
2.5. I don’t know what I need 6
3. Key tasks 7
3.1. Overview 7
3.2. Website business logic description 8
3.2 Task 1 - design classes 16
3.2.1 User class 16
3.2.2 Admin class 18
3.2.3 Instructor class 19
3.2.4 Student class 21
3.2.5 Course class 21
3.3. Task 2 - Index, user register, login and logout 25
3.4. Task 3 - Students page 26
3.5. Task 4 - Courses page 27
3.6. Task 5 - Instructors page 28
Important Notes: 29
1. Key Information
Purpose This assessment is related to the following learning objectives (LO):
● LO4: Investigate useful Python packages for scientific computing
and data analysis
● LO5: Experiment with basic data manipulation, analysis, and
visualisation technique to formulate business insight
● L07: Build a basic web application based on Python web
frameworks
Your task It is an Individual assignment, where you will write a code for a simple
emulation of a data analysis website.
Value 35% of your total marks for the unit
Due Date [Friday 10th Jun 2022, week 14] 4:30 pm
Submission ● Via Moodle Assignment Submission.
● Turnitin will be used for similarity checking of all submissions.
Assessment
Criteria
See Moodle Assessment page
Late
Penalties
● 10% deduction per calendar day or part thereof for up to one
week
● Submissions more than 7 calendar days after the due date will
receive a mark of zero (0) and no assessment feedback will be
provided.
Support
Resources
See Moodle Assessment page
Feedback Feedback will be provided on student work via:
general cohort performance
specific student feedback ten working days post submission
1.1. Do and Do NOT
Do Do NOT
● Maintain academic integrity1
● Get support early from this unit and other
services in the university
● Apply for special consideration for
extensions2
● Leave your assignment in draft mode
● Submit late (10% daily penalty applies)3
● Submission is not accepted after 7 days of
the due date, unless you have special
consideration.
1.2. Documentation
Commenting your code is essential as part of the assessment criteria (refer to
Marking Rubrics).
You should also include comments at the beginning of your program file, which
specify your name, your Student ID, the start date and the last modified date of the
program, as well as with a high-level description of the program. In-line comments
within the program are also part of the required documentation.
1.3. Submission
Your have to submit your assignment via the assignment submission link (i.e.,
“Assignment 2 Submission”) on the Moodle site by the deadline specified in Section
1, i.e. 10th Jun 2022 (Friday) by 4:30 pm:
● There will be NO hard copy submission required for this assignment.
● You are required to submit your assignment as a .zip file named with your
Student ID. For example, if your Student ID is 12345678, you would submit a
zipped file named 12345678.zip
● Do not include any unnecessary file in this folder
● Note that marks will be deducted if this requirement is not strictly complied
with.
● No submission accepted via email.
3 eg: original mark was 70/100, submitting 2 days late results in 50/100 (10 marks off). This
includes weekends
2 https://www.monash.edu/exams/changes/special-consideration (All the Special Consideration
should be applied no later than two University working days after the due date of the affected assessment).
1
https://www.monash.edu/rlo/research-writing-assignments/referencing-and-academic-integrit
y/academic-integrity
1.4. Deliverables
Your submission should contain the following documents:
● All files in the “model” folder include course.py, user.py, user_admin.py,
user_instructor.py and user_student.py.
● All files in the “controller” folder include course_controller.py,
index_controller.py, instructor_controller.py and user_controller.py.
● Several files in the “templates” folder include 00login.html, 00register.html,
10student_list.html and 11student_info.html.
● All files need to be compressed into a zip file. The final submission file name is
{your_student_id}.zip.
● Marks will be deducted for any of these requirements that are not strictly
complied with.
2. Getting help
2.1. English language skills
if you don’t feel confident with your English.
● Talk to English Connect: https://www.monash.edu/english-connect
2.2. Study skills
If you feel like you just don’t have enough time to do everything you need to, maybe
you just need a new approach
● Talk to a learning skills advisor:
https://www.monash.edu/library/skills/contacts
2.3. Things are tough right now
Everyone needs to talk to someone at some point in their life, no judgement here.
● Talk to a counsellor:
https://www.monash.edu/health/counselling/appointments
(friendly, approachable, confidential, free)
2.4. Things in the unit don’t make sense
Even if you’re not quite sure what to ask about, if you’re not sure you won’t be alone,
it’s always better to ask.
● Ask in Ed: https://edstem.org/au/courses/7429/discussion/
● Attend a consultation:
https://lms.monash.edu/course/view.php?id=135703§ion=21
2.5. I don’t know what I need
Everyone at Monash University is here to help you. If things are tough now they
won’t magically get better by themselves. Even if you don’t exactly know, come and
talk with us and we’ll figure it out. We can either help you ourselves or at least point
you in the right direction.
3. Key tasks
This assignment is a data analysis website. You are required to analyse the given data
in folder data/source_course_files. This project is based on Python Flask Framework
and you need to complete the files inside the controller folder named
course_controller.py, index_controller.py, instructor_controller.py and
user_controller.py, model folder named course.py, user.py, user_admin.py,
user_instructor.py and user_student.py and several html pages (views) in the
templates folder called 00login.html, 00register.html, 10student_list.html and
11student_info.html.
This is an individual assignment and must be your own work.
You can use any libraries except the time-related libraries or functions in this
assignment.
In the provided project-> lib folder, there are a few methods and variables in the
helper.py file that can be imported and used in your tasks. For example, if you need
to access the course.txt data file, you can add “from lib.helper import
course_data_path” in your file. All the path variables in the helper.py should not be
changed. Any unexpected changes may cause the website to not run,which will lead
to mark penalties.
3.1. Overview
1. Data explanation In the data folder, the source_course_file folder contains all
the data files we need to use in this assignment. The course.txt and user.txt
files are used to save all the course and user data. The example of course and
user data can be found in _demo_course.txt and _demo_user.txt files.
(course.txt and user.txt files are provided but empty)
2. Folder structure
The image above shows a folder structure of this assignment. Running the
main.py file can start this web application. The template file has some
incomplete code which will generate errors. It is better to finish some tasks
before starting to run the web application.
3. Start the assignment
Step1. Create a new project in Pycharm and copy all the files into this project.
Step2. Open requirements.txt file and you can see the image below.
Step3. Click install requirements.
After the instalment of all libraries, you can start to work on this assignment.
( Feel free to use the `pip install -r requirements.txt` if you can understand this
command)
3.2. Website business logic description
1. Index page - Index page is the homepage of your web application. To launch
the application you must run the main.py file, and use the
link:http://localhost:5000/ in the browser.
Figure 3.1 Index page no login
2. Login page - Login page allows the user to login into the web application which
requires them to input username and password. There are three different
kinds of users, i.e., Admin, Instructor, and student. Each kind of user will see
different contents from the home (index) pages after login.
Figure 3.2 Login page
For example, when a student logs in, the index (home) page looks like the
figure 3.3. Students can only check their own information and logout.
Figure 3.3 Student login page
For example, when the instructor logs in, the index (home) page looks like the
figure 3.4. Instructors can only see the courses they teach and logout.
Figure 3.4 Instructor login page
For example, when admin logs in, the index (home) page looks like the figure
3.5. There is a reset database button which can remove all the content in the
course.txt and user.txt files.
Figure 3.5 Admin login page
4. Register page - Register page allows users to register them into the web
application, in the case they do not have an account. It is required to enter
username, password, email address and role when registering a user. And a
register timestamp(unix epoch time) will be generated automatically. All these
five values will be sent to the application’s backend to store the values in the
user.txt file.
Figure 3.6 Register page
5. Courses page - After a user logs in as admin, they can see the similar page as in
figure3.7. In this page, the total number of courses and 20 course objects will
be displayed. All the course objects can be returned based on the page
number. By default, the page number is 1. Each page has a maximum of 20
courses. At the bottom of the webpage, a page number list is shown. By
default, the page number list is always be [1,2,3,4,5,6,7,8,9].
Two buttons are placed below the total number of courses, which are the
Process Course Data button and the Course Analysis Figure button. The
Process Course Data button will retrieve all the data from given course data
files(this process may take some time). The Course Analysis Figure button will
generate 6 figures and the explanations of each figure. All the figures are
saved into lib.helper.figure_save_path and all the explanations(i.e., the trend
of the figure) about each figure will be displayed in a new webpage.
For each item of course, there will be a Details button and a Delete button.
Details button will take you to the course details page. The Delete button will
remove selected data from the course.txt file and user.txt file.
Figure 3.7 Course list page
Figure 3.8 Course details page
If you login as an instructor, the courses page will show the courses this
instructor teaches.
Figure 3.9 Courses page when login as instructor
If you login as a student, there is no courses page available.
6. Instructors page - In this page, the total number of instructors will be
displayed. Because each instructor can teach more than one course, the total
number of instructors is less than the total number of courses. All the
instructor objects can be returned based on the page number. By default, the
page number is 1. Each page has a maximum of 20 instructors. At the bottom
of the webpage, a page number list is shown. For each instructor, we can see
all the courses this instructor teaches by clicking the Teach Courses button.
There are two buttons below the total number, that are Process Instructor
Data button and Instructor Analysis Figure button. The Process Instructor will
extract all the instructor information from the given data files and store
instructors info into the user.txt file. This method may take a while to finish.
The Instructor Analysis Figure button has similar functionality as the course
analysis button.
Figure 3.10 Instructors page
7. Students page. In this page, the total number of students and a list of students
will be displayed. Students’ info are not extracted from the files but registered
manually in the register page.
Figure 3.11 students page
Admin can click the details button to see students’ details and click the delete
button to remove this student (the student info will be deleted from the
user.txt file).
If you login as a student, you can only see the MyInfo page.
Figure 3.12 Myinfo page when login as a student
3.2 Task 1 - design classes
You are required to implement the User class, Admin class, Instructor class, Student
class, and Course class in the user.py, user_admin.py, user_instructor.py,
user_student.py and course.py files respectively. The Admin, Instructor and Student
class should inherit from the User class. The methods of each class are described
below. The path in the helper.py file is valid for the Flask application. If you hope to
perform a local test, you need to change the path. But, remember to change it back
when you submit your files as your tutor will mark your work based on the
submission files. The helper.py file is not submitted.
3.2.1 User class
1. constructor.
Five positional arguments: uid(int, default value is -1), username(str, default
value is “”), password(str, default value is “”), register_time(str, default value is
“yyyy-MM-dd_HH:mm:ss.SSS”), role(str, default value is “”). The role can only
be value “admin”, “instructor” and “student”.
2. __str__()->str.
Return string format example:
“uid;;;username;;;password;;;register_time;;;role”
3. authenticate_user()->(bool, str).
Two positional arguments - username and password. This method is used to
check whether username and password can be matched with users saved in
user.txt data file. If matched, this method will retrieve the user information
from user.txt file and return a tuple (True, user_info_string), otherwise return
(False, “”).
4. check_username_exist()->bool.
One positional argument - username. This method is to check whether the
given username exists in the user.txt data file. If it exists, return True,
otherwise return False.
5. generate_unique_user_id()->str.
This method is used to generate and return a 6 digit unique user id which is
not in the user.txt file.
6. encrypt_password()->str.
One positional argument - password. For a given password, you are required
to encrypt the string. You can reuse the encryption method in A1/A2 here.
7. register_user()->bool.
Five positional arguments - username, password, email, register_time, role.
The validation can happen in this function or before calling this function.
o If the username exists in the user.txt file, return False.
o A unique user id is required when registering a new user.
o If the user registers successfully, return True.
o Register_time will be a unix epoch timestamp (milli seconds) which
needs to be converted using date_conversion() method.
o The new user needs to be written into the user.txt file. All the attributes
are separated by three semicolons - “;;;”. The registration of different
roles could generate different strings.
The format example 1:
The format example 2:
(username: test_instructor, password: test_instructor)
The 9 semi-colons here indicate there are no values for
display_name(str, default value is “”), job_title(str, default value is “”)
and course_id_list(list, default value is []).
8. date_conversion()-> str.
One positional argument - register_time. The given register_time will be a unix
epoch timestamp (milli seconds) and it needs to be converted to format
“year-month-day_hour:minute:second.milliseconds”. For example, a
timestamp 1637549590753 will be converted to str
“2021-11-22_13:53:10.753” and returned. The time should be GMT+11
Melbourne timezone.
Refer this link https://www.unixtimestamp.com/index.php to check how to
convert unix epoch time to human readable format. A method called
get_day_from_timestamp(timestamp) is provided in the lib.helper file. By
using this method, you can convert the timestamp to the day of month. You
can import and use this method in the user.py file. It is not allowed to use any
time-related libraries or functions here. You are required to implement the
conversion by yourself. Because we use some approximate values like 1 month
(30.44 days) = 2629743 seconds, the boundary cases can be ignored like 1st
Mar. Only make sure most of the results are correct. If you hope to try to
generate a very accurate result, it is great (no extra mark allocated). The final
readable time would be GMT +11.
9. validate_username()-> bool.
One positional argument - username. The username can only be letters or
underscore. If not, return False.
10. validate_password()-> bool.
One positional argument - password. The length of password must be greater
than or equal to 8. If not, return False.
11. validate_email()-> bool.
One positional argument - email. Use regex expressions to check whether the
email address is valid or not. The email should end with “.com”, contain “@”,
and have length greater than 8. If not, return False.
12. clear_user_data() no return.
This method will remove all the data in the user.txt file.
13. Class variable current_login_user.
Default value is None. This variable is used to save the user object(Could be
Admin, Instructor or Student object) after login. If the user is not logged in, the
web application will redirect the web page to the index page.
3.2.2 Admin class
1. constructor.
This method has five positional arguments: uid(int, default value is -1),
username(str, default value is “”), password(str, default value is “”),
register_time(str, default value is “yyyy-MM-dd_HH:mm:ss.SSS”) and role(str,
default value is “admin”). Admin account does not have an email address
attribute.
2. __str__()->str.
Return string format example:
3. register_admin() no return.
This method will create a new admin account and write this account into the
user.txt file. This method does not need to call the register method
implemented in the User class. And, no validation required for the admin
account. The default username and password can be any value predefined by
yourself. For example, username=”admin”, password=”admin”. Admin account
cannot be registered via frontend webpages.
3.2.3 Instructor class
1. constructor.
This method has 9 positional arguments: uid(int, default value is -1),
username(str, default value is “”), password(str, default value is “”),
register_time(str, default value is “yyyy-MM-dd_HH:mm:ss.SSS”), role(str,
default value is “instructor”), email(str, default value is “”), display_name(str,
default value is “”), job_title(str, default value is “”) and course_id_list(list,
default value is []).
2. __str__()->str.
Return string format example:
Example 1 (registered manually, so display_name=””, job_title=””,
course_id_list=[]):
Example 2 (extracted from files):
3. get_instructors() no return.
This method will extract instructor information from the given course data
files. Similar to the process of retrieving course data, but this method focuses
on the instructor data of each course. In each course item, there could be
multiple instructors. There is no need to perform registration validation for
each instructor’s info in this method. All the null value in json str should be
saved as None or string “null”. All the empty string value “” should be saved as
same empty string “”.
After retrieving the required data, you need to write the info into user.txt file
to save all the instructor data. Each attribute needs to be separated by “;;;”.
The required attributes and data format is:
“{instructor_id};;;{username};;;{password};;;{register_time};;;{role};;;{email};;;{
instructor_display_name};;;{instructor_job_title};;;{course_id_list}”. The
username is generated by converting the display name to lowercase and
replacing the whitespace to underscore. The password uses the instructor_id
value directly. The email address is generated by combining the username and
the “@gmail.com”. All the course ids in the course_id_list will be connected to
using two “-” marks. The format is “course_id--course_id--course_id”. If an
instructor is already in the user.txt file, only update the course_id_list which
saves the course this instructor teaches. The register_time uses the default
value.
The auto-generated instructor accounts are different from the manually
registered instructor account. Manually registered instructor accounts do not
have any course_id_list. And, the display name and job title are empty.
However, these accounts should have the same format in user.txt as the
auto-generated accounts.
For example:
4. get_instructors_by_page()->tuple
One positional argument: page. This method reads the user.txt file to retrieve
all the instructor information. With all the instructor information and the
current page number, a list of Instructor objects and the total pages will be
generated. Each page has at most 20 instructors. A tuple contains the list of
instructors, total page number and the total number of instructors will be
returned.
5. generate_instructor_figure1()->str
Generate a graph that shows the top 10 instructors who teach the most
courses.(any chart)
In all the graphs, if the instructor display name is too long, you need to extract
the first 3 words. The generate_instructor_figure1() method is required to
return a string explanation about your understanding of this figure. All the
graphs use the instructor title, course title, category title or subcategory title
as x-axis labels.
3.2.4 Student class
1. constructor.
Six positional arguments: uid(int, default value is -1), username(str, default
value is “”), password(str, default value is “”), register_time(str, default value is
“yyyy-MM-dd_HH:mm:ss.SSS”), role(str, default value is “student”), email(str,
default value is “”)
2. __str__()->str.
Return string format example:
3. get_students_by_page()->tuple.
One positional argument: page. This method reads the user.txt file to retrieve
all the student information. With all the student information and the current
page number, a list of Student objects and the total pages will be generated.
Each page has at most 20 students. A tuple contains the list of students, total
page number and the total number of students will be returned.
4. get_student_by_id()->Student object
One positional argument id. This method returns a student object by retrieving
the id from the user.txt file.
5. delete_student_by_id()->bool
One positional argument id. This method deletes a student item from the
user.txt file based on the given id.
3.2.5 Course class
1. constructor.
Eleven positional arguments: category_title(str, default value is “”),
subcategory_id(int, default value is -1), subcategory_title(str, default value is
“”), subcategory_description(str, default value is “”), subcategory_url(str,
default value is “”), course_id(int, default value is -1), course_title(str, default
value is “”), course_url(str, default value is “”), num_of_subscribers(int, default
value is 0), avg_rating(float, default value is 0.0) and num_of_reviews(int,
default value is 0).
2. __str__()->str.
Return format:
{category_title};;;{subcategory_id};;;{subcategory_title};;;{subcategory_descrip
tion};;;{subcategory_url};;;{course_id};;;{course_title};;;{course_url};;;{num_of
_subscribers};;;{avg_rating};;;{num_of_reviews}
Return string format example:
3. get_courses() no return.
This method will extract course information from the given course data files. In
the source_course_files folder, there are 4 categories of courses. In each
category folder, there are some subcategories. Inside each subcategory folder,
you can find the course json files. You need to retrieve the category_title from
the 4 category folder names and other course info from the json files. In each
json file, there is another category name which is also acceptable for
category_title value like the image below.
All the null value in json str should be saved as None or string “null”. All the
empty string value “” should be saved as same empty string “”.
After retrieving the required data, you need to write the info into course.txt
file to save all the course data. All the data need to be separated by “;;;”. The
required attributes and data format is:
“{category_title};;;{subcategory_id};;;{subcategory_title};;;{subcategory_descri
ption};;;{subcategory_url};;;{course_id};;;{course_title};;;{course_url};;;{num_o
f_subscribers};;;{avg_rating};;;{num_of_reviews}”.
4. clear_course_data() no return.
This method will remove all the content in the course.txt file. After calling this
method, the course.txt file will become an empty file.
5. generate_page_num_list()->list of int.
Two positional arguments: page and total_pages. This method uses the
current page number and total pages to generate a list of integers as viewable
page numbers. For example, the image below shows a default page number
list [1,2,3,4,5,6,7,8,9] when the current page number is 1.
If the current page number is less than or equal to 5, the generated page
number list is always [1,2,3,4,5,6,7,8,9]. If the current page number is greater
than 5 and less than total pages minus 4, the page number list will be integers
from current page number minus 4 until current page number plus 4. For
example, in the image below, the current page is 8 and the number list
becomes [4,5,6,7,8,9,10,11,12].
If the current page is greater than or equal to total pages minus 4, the list of
numbers changes to range between total pages minus 8 until total pages.
6. get_courses_by_page()->tuple
One positional argument: page. The return value is a tuple that contains a list
of Course objects, total pages of courses and the total number of courses. This
method reads the course.txt file to retrieve all the course information. With all
the course information and the current page number, a list of Course objects
will be generated, the total pages and the total number of courses will be
returned. Each page has at most 20 courses.
For example, if there are 100 courses info in the course.txt file and the current
page number is 2, then the 21-40 lines course info will be converted to a list
with 20 Course objects. The total page number is 5.
7. delete_course_by_id()->bool
One positional argument: course_id. The method reads course info from the
course.txt file and deletes the course information belongs to that course_id.
Meanwhile, if an instructor in the user.txt file teaches this course, the course
id should also be removed from the instructor’s course_id_list. Finally, this
method returns whether the deletion is successful or not. If the course_id
cannot be found in the course.txt file, return False.
8. get_course_by_course_id()->tuple
One positional argument: course_id. You are required to find the course by
given course_id and convert the info to a Course object. Then, using the
retrieved course info to get the num_of_subscribers, avg_rating and
num_of_reviews. Based on these three numbers, generate a comment for this
course. If the num_of_subscribers greater than 100000 and avg_rating greater
than 4.5 and num_of_reviews greater than 10000, the comment should be
“Top Courses”. If the num_of_subscribers greater than 50000 and avg_rating
greater than 4.0 and num_of_reviews greater than 5000, the comment should
be “Popular Courses”. If the num_of_subscribers greater than 10000 and
avg_rating greater than 3.5 and num_of_reviews greater than 1000, the
comment should be “Good Courses”. The other courses are “General Courses”.
The Course object and comment will be returned as a tuple.
9. get_courses_by_instructor_id()->tuple
One positional argument: instructor_id. This method reads the user.txt file and
course.txt file to find all the course information the specified instructor
teaches. If this instructor teaches more than 20 courses, only 20 courses will
be returned with the total number of courses this instructor teaches (do not
need to sort, just use the default order and get the first 20). Otherwise, all the
courses and the total number will be returned. The return type is a tuple that
contains a list of course objects and the total number of courses teached by
this instructor.
10. generate_course_figure1()->str
Generate a graph to show the top 10 subcategories with the most subscribers.
(any chart)
11.generate_course_figure2()->str
Generate a graph to show the top 10 courses that have lowest avg rating and
over 50000 reviews.(any chart)
12. generate_course_figure3()->str
Generate a graph to show the all the courses avg rating distribution that has
subscribers between 100000 and 10000 (scatter chart)
13. generate_course_figure4()->str
Generate a graph to show the number of courses for all categories and sort in
ascending order (pie chart, offsetting the second largest number of course
with "explode")
14. generate_course_figure5()->str
Generate a graph to show how many courses have reviews and how many
courses do not have reviews.(bar chart)
15. generate_course_figure6()->str
Generate a graph to show the top 10 subcategories with the least courses (any
chart)
In all the graphs, if the course title is too long, you need to extract the first 3 words. If
the Course title is "Welcome to introduction to Python", using "Welcome to
introduction" is enough. If you have extra time, you can also extract the key word like
"introduction to Python". But, this may require a complex process as your program
may need to understand the sentence. All the generate_course_figure{1-6} methods
are required to return a string explanation about your understanding of this figure.
All the graphs use the instructor title, course title, category title or subcategory title
as x-axis labels.
3.3. Task 2 - Index, user register, login and logout
This part will call the methods implemented in previously designed classes. In the
lib/helper.py file, there are two functions called render_result() and
render_err_result(), which can be used to return result success or failure for POST
methods.
1. index() in index_controller. GET request, route is “/”.
There is only one method in the index_controller which is the index page of
this web application. In this method, it is required to check the class variable
User.current_login_user to see if there is any logged user. If there exists a
logged user, pass the current_login_user’s role to context[‘current_user_role’].
Otherwise, do nothing. Next, create an admin account and register it manually.
Finally, render the “01index.html”. Admin account should be generated every
time in the index_controller/index() method. But, you need to handle the
duplicates. If an admin account already exists with the same username and
password in the user.txt file, do not overwrite it.
2. login() in user_controller. GET request, route is “/login”.
Return the “00login.html” page.
3. login_post() in user_controller. POST request, route is “/login”.
Get “username”, “password” values from the request.values. Use the user
validation methods to check the username and password. If all valid, call the
authentication method. If username and password belong to a valid user,
return the string info of this user. Then, generate a corresponding user object
using the generate_user() method and assign this user to the
User.current_login_user class variable.
4. templates/00login.html page
Create two input boxes here for users to input username and password. The
type of username input is text and the type of password input is password.
Write your code within the student code comment area.
5. logout() in user_controller. GET request, route is “/logout”.
Reset the User.current_login_user to None and return the “01index.html”
page.
6. generate_user(login_user_str) in user_controller.
This method is defined and used only in user_controller for login_post()
method. Because after login, it is required to generate a user object(could be
Admin, Instructor or Student). Since using child class in parent class will cause
exceptions, the User.authenticate_user() method cannot return an
Admin/Instructor/Student object directly. So,you need to return a user string
in User.authenticate_user() and convert the user string to an object in this
generate_user() method. The return object could be
Admin()/Instructor()/Student().
7. register() in user_controller. GET request, route is “/register”.
Return the “00register.html” page.
8. register_post() in user_controller. POST request, route is “/register”.
Get “username”, “password”, “email”, “register_time”, “role” values from the
request.values. Use the user validation methods to check the username,
password and email. If all valid, register this user. Otherwise, return
render_err_result(msg=”proper message for users”).
9. templates/01register.html page
Create three input boxes for the user to input username, password and email.
The type of username and email input are text and the type of password input
is password. Write your code within the student code comment area.
3.4. Task 3 - Students page
1. student_list() in user_controller. GET request, route is “/student-list”.
Try to write this method by referring to the instructor_list and course_list.
Make sure the context dict has “context['one_page_user_list']”,
“context['total_pages']”, “context['page_num_list']”, “context['current_page']”,
“context['total_num']”, “context["current_user_role"]” has values as the web
pages need to show these values and may cause errors if these values are not
exist.
2. student_info() in user_controller. GET request, route is “/student-info”.
Find a student based on the “id” attribute in the request.values. If not exist,
return a new student and set all instance variables with default values. Make
sure the “context["current_user_role"]” has values.
3. student_delete() in user_controller. GET request, route is “/student-delete”.
Delete student according to the “id” attribute in the request.values. This
method will return “redirect(url_for(user_page.student_list))” if successful.
Otherwise, return “redirect(url_for(index_page.index))”.
4. templates/10student_list.html page
Create a table to show the information of users. Each row of table need to
show one student info and a details button/link and a delete button/link. The
href of the details button is “/user/student-info?id={{user.uid}}” and the href
of the delete button is “/user/student-delete?id={{user.uid}}”. Write your code
within the given table tag. For example, btn-primary”>Details, btn-danger”>Delete. When clicking Details link, you will go to
student_info page. When clicking Delete link, you will delete one student item.
If you do not use class attribute here in the HTML tag , it is also correct.
5. templates/11student_info.html page
Create a page to have a header print out “Student Info” and all the
information of a student below the header. Write your code within the given
div tag.
3.5. Task 4 - Courses page
1. course_list() in course_controller. GET request, route is “/course-list”.
In this method, some code is already provided. Add more code to make the
method run. If the user is not logged in, should not allow access to the courses
and redirect the page to “index_page.index”. If there exists a logged user, get
the expected course list and page number list. Make sure the
“context["current_user_role"]” has values.
For Mac users, if you meet the “Method not allowed” error in pages, try to
refresh the page. If the result can show properly, there should be no errors in
your backend logic and you can ignore this error.
2. reset_database() in course_controller. POST request, route is
“/reset-database”.
This method simply removes all the content in the user.txt and course.txt files
by calling methods in User and Course class. After finish, return a success
message. If an error happens, return the render_err_result(msg=”exception
happened”) method result. Use try except block in this method to handle
exceptions.
3.6. Task 5 - Instructors page
1. Instructor_list() in instructor_controller. Get request, route is “/instructor-list”.
In this method, some code is already provided. Add more code to make the
method run. If the user is not logged in, should not allow access to the
instructors and redirect the page to “index_page.index”. If there exists a
logged user, get the expected instructor list and page number list. Make sure
the “context["current_user_role"]” has values.
For Mac users, if you meet the “Method not allowed” error in pages, try to
refresh the page. If the result can show properly, there should be no errors in
your backend logic and you can ignore this error.
2. teach_courses() in instructor_controller. GET request, route is
“/teach-courses”.
In this method , some code is already provided. Add more code to make the
method run. If the user is not logged in, should not allow access to the teach
courses and redirect the page to “index_page.index”. If there exists an “id”
attribute in the request.values, assign this value to the instructor_id. If there is
no “id” attribute in the request.values, use the current logged user’s id as the
instructor_id. Then, you can get the teach courses list. Make sure the
“context["current_user_role"]” has values.
Important Notes:
● If any exception/error happens when running your program, you will lose
50% marks.
● Please refer to the _demo_{data}.txt file to see the correct data format
● Your program should also work if you change all the data file paths to demo
data file paths.

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