class Student:definit__(self, first, last, gpa):self.first = first # first name#last nameself.last = lastself.gpagpa# grade point averagedef get_gpa(self):return self.gpadef get_last (self):return self.lastdef to_string(self):return self.first + T1class Course:definit__(self):self.rosterdef drop_student(self, student):# Type your code heredef add_student(self, student):self.roster.append(student)def count students(self):return len(self.roster)if __name__1+ self.last +_main__":# list of Student objectscourse Course()1(GPA:+ str(self.gpa) + ')'course.add_student (Student('Henry', 'Nguyen', 3.5))course.add_student(Student('Brenda', 'Stern', 2.0))course.add_student (Student('Lynda', 'Robinson', 3.2))course.add_student (Student('Sonya', 'King', 3.9))print (f'Course size: { course.count_students() } students')course.drop_student('Stern')print (f'Course size after drop: { course.count_students() } students') 14.24 LAB: Drop studentComplete the Course class by implementing the drop_student() instance method, which removes a student (by last name) from the courseroster. If the student is not found in the course roster, no student should be dropped.The file main.py contains:The main function for testing the program.• Class Course represents a course, which contains a list of Student objects as a course roster. (Type your code in here.)Class Student represents a classroom student, which has three attributes: first name, last name, and GPA. (Hint: get_last() returns thelast name field.)●●Note: For testing purposes, different student values will be used.Ex. For the following students:Henry Nguyen 3.5Brenda Stern 2.0Lynda Robison 3.2Sonya King 3.9the output for dropping Stern is:Course size: 4 students.Course size after drop: 3 students

Introduction In Python, a function is a named and reusable block of code that performs a specific…

class Student: definit__(self, first, last, gpa): self.first = first # first name self.last last #last name self.gpagpa #grade point average def get_gpa(self): return self.gpa def get_last (self): return self.last def to_string(self): 1 return self.first + ' ' + self.last + (GPA: class Course: definit__(self): self.roster = [] #list of Student objects def drop_student(self, student): # Type your code here def add_student(self, student): self.roster.append(student) def count students(self): return len(self.roster) if __name__ "__main__": course Course() 1 + str(self.gpa) + ')' course.add_student(Student('Henry', 'Nguyen', 3.5)) course.add_student (Student('Brenda', 'Stern', 2.0)) course.add_student (Student('Lynda', 'Robinson', 3.2)) course.add_student(Student('Sonya', 'King', 3.9)) print(f'Course size: { course.count_students() } students') course.drop_student('Stern') print (f'Course size after drop: { course.count_students() } students')

class Student: definit__(self, first, last, gpa): self.first = first # first name self.last last #last name self.gpagpa #grade point average def get_gpa(self): return self.gpa def get_last (self): return self.last def to_string(self): 1 return self.first + ' ' + self.last + (GPA: class Course: definit__(self): self.roster = [] #list of Student objects def drop_student(self, student): # Type your code here def add_student(self, student): self.roster.append(student) def count students(self): return len(self.roster) if name "main": course Course() 1 + str(self.gpa) + ')' course.add_student(Student('Henry', 'Nguyen', 3.5)) course.add_student (Student('Brenda', 'Stern', 2.0)) course.add_student (Student('Lynda', 'Robinson', 3.2)) course.add_student(Student('Sonya', 'King', 3.9)) print(f'Course size: { course.count_students() } students') course.drop_student('Stern') print (f'Course size after drop: { course.count_students() } students')

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

class Student:
definit__(self, first, last, gpa):
self.first = first # first name
#last name
self.last = last
self.gpagpa
# grade point average
def get_gpa(self):
return self.gpa
def get_last (self):
return self.last
def to_string(self):
return self.first + T
1
class Course:
definit__(self):
self.roster
def drop_student(self, student):
# Type your code here
def add_student(self, student):
self.roster.append(student)
def count students(self):
return len(self.roster)
if __name__
1
+ self.last +
_main__":
# list of Student objects
course Course()
1
(GPA:
+ str(self.gpa) + ')'
course.add_student (Student('Henry', 'Nguyen', 3.5))
course.add_student(Student('Brenda', 'Stern', 2.0))
course.add_student (Student('Lynda', 'Robinson', 3.2))
course.add_student (Student('Sonya', 'King', 3.9))
print (f'Course size: { course.count_students() } students')
course.drop_student('Stern')
print (f'Course size after drop: { course.count_students() } students')

14.24 LAB: Drop student
Complete the Course class by implementing the drop_student() instance method, which removes a student (by last name) from the course
roster. If the student is not found in the course roster, no student should be dropped.
The file main.py contains:
The main function for testing the program.
• Class Course represents a course, which contains a list of Student objects as a course roster. (Type your code in here.)
Class Student represents a classroom student, which has three attributes: first name, last name, and GPA. (Hint: get_last() returns the
last name field.)
●
●
Note: For testing purposes, different student values will be used.
Ex. For the following students:
Henry Nguyen 3.5
Brenda Stern 2.0
Lynda Robison 3.2
Sonya King 3.9
the output for dropping Stern is:
Course size: 4 students.
Course size after drop: 3 students

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python class Student:def __init__(self, first, last, gpa):self.first = first # first nameself.last = last # last nameself.gpa = gpa # grade point average def get_gpa(self):return self.gpa def get_last(self):return self.last def to_string(self):return self.first + ' ' + self.last + ' (GPA: ' + str(self.gpa) + ')' class Course:def __init__(self):self.roster = [] # list of Student objects def drop_student(self, student):# Type your code here def add_student(self, student):self.roster.append(student) def count_students(self):return len(self.roster) if __name__ == "__main__":course = Course() course.add_student(Student('Henry', 'Nguyen', 3.5))course.add_student(Student('Brenda', 'Stern', 2.0))course.add_student(Student('Lynda', 'Robinson', 3.2))course.add_student(Student('Sonya', 'King', 3.9)) print('Course size:', course.count_students(),'students')course.drop_student('Stern')print('Course size after drop:', course.count_students(),'students')
Exercise 1-Account class • Design a class named Account that contains : • A private int data field named id for the account • A private double data field named balance for the account • A privet Date data field named dateCreated that stores the date when the account was created • A no-arg constructor that creates a default account • A constructor that creates an account with the specified id and initial balance • The getters (i.e., accessors) and setters (i.e., mutators) methods for id and balance • The getter method for dateCreated • A method named withdraw that withdraws a specified amount from the account • A method named deposit that deposits a specified amount to the account
A(n) is a unique form of class member that enables an object to store and retrieve data.
Car Class Project The car classwill havethe following attributes: •year: an integer that holds the car's model year •model: a string that holds the make of the car •make: a string that holds the model of the car •speed: an integer that holds the car's current speed Your class should contain thefollowing: A docstring that briefly describes the class and lists the attributes. The docstring will serve as the documentation for your class. •A constructor (__init__ method) that takes the car's year model and make as optional arguments. The constructor will set the value of the speed attribute to 0.•An __str__ method that returns the car's year model and makein a string. •To test your class, create acar object and use the print function to verify that the constructor and __str__ methodsare working correctly. •An accessor method which returns the value stored in the speed instance variable. Call this method getSpeed(). •A modifier method called accelerate() which adds 5 to the speed variable…
class Book: book_belongs_to = 'Schulich School of Engineering' def _init_(self, pages = 0, title = 'Unknown', author = 'Unknown', isbn = self.pages = pages self.title = title e): self.author = author self.isbn = isbn book1 = Book(255, 'Black Beauty', 'Anna Sewell', 9780001840423) book2 = Book(208, 'The Chrysalids', 'John Wyndham', 9780140013085) Book.book_belongs_to = 'Emily Marasco' book3 = Book()
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Personal Information Class: Design a class called Employee that holds the following data about an employee: name ID number Department Job Title Class. Store your class in a separate file called employee.py. Your class will have an initializer method that will be passed the information entered by the user as arguments. Write appropriate accessor and mutator methods for each data attribute. Write a __str__ method to print the contents of the class (see example of __str__ on p. 523). Main program: Your main program should create three instances of the class. Your program should get the information from the user and pass it as parameters to the initializer method. Using the __str__ method invoked by the print function, the program should display the personal information for the three individuals. Output and Sample Dialog: Enter employee name: Mary Smith Enter employee ID: 123456 Enter department: Accounting Enter position: Accountant Enter employee name: Joe Morales Enter…