/Python-Logical_thinking-II-master

Primary LanguagePython

Python-Logical_thinking-II-master

Python logical expressions

Description

In this exercise, we will practice on more complex logical expressions including various predicates and operators.

Tasks

Task 1:

Let's consider the following list of users:

users = [
    {
        "name": "Holly",
        "type": "Student",
        "password": "hunter",
        "modules": [
            {
                "title": "Computer basics",
                "completed": True
            },
            {
                "title": "Python basics",
                "completed": False
            }
        ]
    },
    {
        "name": "Peter",
        "type": "Student",
        "password": "pan",
        "modules": [
            {
                "title": "Computer basics",
                "completed": False
            }
        ]
    },
    {
        "name": "Luke",
        "type": "Student",
        "password": "skywalker",
        "modules": [
            {
                "title": "Computer basics",
                "completed": True
            }
        ]
    },
    {
        "name": "Janis",
        "type": "Teacher",
        "password": "joplin"
    }
]

Using the concepts, and some code from the previous exercises, define a function named show_registration that checks if a user is registered to a specific module.

The function will accept three input arguments:

  • username. String
  • password. String
  • modulename. String

The function may print any of the following messages:

  • You are registered to the module {modulename}. It will print this message if the user is a student and in his modules key has a module with a title equal to the argument modulename
  • You did not register to the module {modulename} It will print this message if the user is anonymous or is a student and in his modules key DOES NOT have a module with the given title.
  • You are a teacher It will print this message if the username is a teacher.

You may use additional functions to filter or store logical expressions to use in your show_registration function.

You may use more than one conditional.

Use the following code to test:

username = input("What is your username? ")
password = input(f"Type the password for username {username}: ")
modulename = input("What module do you want to check? ")
show_registration(username, password, modulename)
  • Your result should look like this:
What is your username? Peter
Type the password for username Peter: pan
What module do you want to check? Computer basics
You are registered to the module Computer basics.

What is your username? Luke
Type the password for username Luke: skywalker
What module do you want to check? Python basics
You did not register to the module Python basics.

What is your username? Janis
Type the password for username Janis: joplin
What module do you want to check? Django
You are a teacher.

What is your username? Anonymous
Type the password for username Anonymous: empty
What module do you want to check? Computer basics
You did not register to the module Computer basics.

Task 2

Now add another function named has_completed_module similar to show_registration with the same input arguments and the following differences:

  • This time, the function will do nothing if the user is valid and a teacher.
  • It will check if, besides having a particular module in the user's list, the module has the key completed set to True.

Use the following code to test:

username = input("What is your username? ")
password = input(f"Type the password for username {username}: ")
modulename = input("What module do you want to check? ")
show_registration(username, password, modulename)
has_completed_module(username, password, modulename)
  • Your result should look like this:
What is your username? Peter
Type the password for username Peter: pan
What module do you want to check? Computer basics
You are registered to the module Computer basics.
You did not complete the module Computer basics.

What is your username? Luke
Type the password for username Luke: skywalker
What module do you want to check? Computer basics
You are registered to the module Computer basics.
You have completed the module Computer basics.

What is your username? Janis
Type the password for username Janis: joplin
What module do you want to check? Django
You are a teacher.

What is your username? Anonymous
Type the password for username Anonymous: password
What module do you want to check? Django
You did not register to the module Django.
You did not complete the module Django.

Task 3

Now we are given this list of modules:

modules = [
    {
        "name": "Computer basics"
    },
    {
        "name": "Python basics",
        "requirement": "Computer basics"
    },
    {
        "name": "Django",
        "requirement": "Python basics"
    }
]

Add a new function named may_enroll with three input parameters:

  • username. String
  • password. String
  • modulename. String

This function should return True in the following cases:

  • The user is anonymous and the module has no requirement (they can always register).
  • The user is a student and:
    • The user is not already registered to that module.
    • The module has no requirement or it has one and the user meets the requirement (is also registered to the requirement and its completed flag is set to True).

In any other case, the function should return False.

Keep the code from previous exercises.

A teacher cannot register to any module.

An anonymous user will only be allowed to register if the module has no requirement. If that happens, the script should not execute any other logical expression.

Use as many functions as needed to keep the logical expressions easy to read. Use semantic names for those functions to improve the readability. Example: is_anonymous(), has_no_requirement(), meets_requirement(), ...

Use any concept learned on the slides: short-circuiting, grouping,...

Use the following code to test:

username = input("What is your username? ")
password = input(f"Type the password for username {username}: ")
modulename = input("What module do you want to check? ")
show_registration(username, password, modulename)
has_completed_module(username, password, modulename)
if may_enroll(username, password, modulename):
    print(f"You may register to the module {modulename}.")
else:
    print(f"You may not register to the module {modulename}.")
  • Your result should look like this:
What is your username? Peter
Type the password for username Peter: pan
What module do you want to check? Computer basics
You are registered to the module Computer basics.
You did not complete the module Computer basics.
You may not register to the module Computer basics.

What is your username? Peter
Type the password for username Peter: pan
What module do you want to check? Python basics
You did not register to the module Python basics.
You did not complete the module Python basics.
You may not register to the module Python basics.

What is your username? Luke
Type the password for username Luke: skywalker
What module do you want to check? Python basics
You did not register to the module Python basics.
You did not complete the module Python basics.
You may register to the module Python basics.

What is your username? Janis
Type the password for username Janis: joplin
What module do you want to check? Django
You are a teacher.
You may not register to the module Django.

What is your username? Anonymous
Type the password for username Anonymous: password
What module do you want to check? Computer basics
You did not register to the module Computer basics.
You did not complete the module Computer basics.
You may register to the module Computer basics.

What is your username? Anonymous
Type the password for username Anonymous: password
What module do you want to check? Django
You did not register to the module Django.
You did not complete the module Django.
You may not register to the module Django.

What is your username? Peter
Type the password for username Peter: pan
What module do you want to check? PHP
You did not register to the module PHP.
You did not complete the module PHP.
You may not register to the module PHP.