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Author: ShadmanSakibRahman

Concept 6 – Static Class Variables and Methods/Problem 01.py

@@ -0,0 +1,47 @@
+class Student:
+
+    ID = 0
+
+    def __init__(self, name, department, age, cgpa):
+        self.name = name
+        self.department = department
+        self.age = age
+        self.cgpa = cgpa
+
+    def get_details(self):
+        print(f"ID: {Student.ID}")
+        print(f"Name: {self.name}")
+        print(f"Department: {self.department}")
+        print(f"Age: {self.age}")
+        print(f"CGPA: {self.cgpa}")
+
+    @classmethod
+    def from_String(cls, str_info):
+        name, department, age, cgpa = str_info.split("-")
+        return cls(name, department, age, cgpa)
+
+
+s1 = Student("Samin", "CSE", 21, 3.91)
+s1.get_details()
+print("-----------------------")
+s2 = Student("Fahim", "ECE", 21, 3.85)
+s2.get_details()
+print("-----------------------")
+s3 = Student("Tahura", "EEE", 22, 3.01)
+s3.get_details()
+print("-----------------------")
+s4 = Student.from_String("Sumaiya-BBA-23-3.96")
+s4.get_details()
+
+# Quesiton -1
+print(
+    "Changing the class variable value will also change all the instance value that inherited the same variable from the class"
+)
+print(
+    "But changing a instance variable will only change the varialbe value inside of that specific instance\n"
+)
+
+# Quesiotn -2
+print(
+    "Instance methods cannot be accessed without the instance of that class, but class methods don't need a instance to be used"
+)

Concept 6 – Static Class Variables and Methods/Problem 02.py

@@ -0,0 +1,33 @@
+class Assassin:
+
+    assassin_count = 0
+
+    def __init__(self, name, success):
+        self.name = name
+        self.success = success
+        Assassin.assassin_count += 1
+
+    def printDetails(self):
+        print(f"Name: {self.name}")
+        print(f"Success rate: {self.success}%")
+        print(f"Total number of Assassin: {Assassin.assassin_count}")
+
+    @classmethod
+    def failureRate(cls, name, rate):
+        success = 100 - rate
+        return cls(name, success)
+
+    @classmethod
+    def failurePercentage(cls, name, percentage):
+        success = 100 - percentage
+        return cls(name, success)
+
+
+john_wick = Assassin("John Wick", 100)
+john_wick.printDetails()
+print("================================")
+nagisa = Assassin.failureRate("Nagisa", 20)
+nagisa.printDetails()
+print("================================")
+akabane = Assassin.failurePercentage("Akabane", 10)
+akabane.printDetails()

Concept 6 – Static Class Variables and Methods/Problem 03.py

@@ -0,0 +1,40 @@
+class Passenger:
+
+    count = 0
+
+    def __init__(self, name):
+        self.name = name
+        Passenger.count += 1
+
+    def set_bag_weight(self, weight):
+        self.weight = weight
+
+        if weight < 20:
+            self.fare = 450
+
+        elif weight >= 21 and weight <= 50:
+            self.fare = 500
+
+        else:
+            self.fare = 550
+
+    def printDetail(self):
+        print(f"Name: {self.name}")
+        print(f"Bus Fare: {self.fare}")
+
+
+print("Total Passenger:", Passenger.count)
+p1 = Passenger("Jack")
+p1.set_bag_weight(90)
+p2 = Passenger("Carol")
+p2.set_bag_weight(10)
+p3 = Passenger("Mike")
+p3.set_bag_weight(25)
+print("=========================")
+p1.printDetail()
+print("=========================")
+p2.printDetail()
+print("=========================")
+p3.printDetail()
+print("=========================")
+print("Total Passenger:", Passenger.count)

Concept 6 – Static Class Variables and Methods/Problem 04.py

@@ -0,0 +1,45 @@
+class Travel:
+
+    count = 0
+
+    def __init__(self, source, destination, time=1):
+        self.source = source
+        self.destination = destination
+        self.time = time
+        Travel.count += 1
+
+    def set_source(self, source):
+        self.source = source
+
+    def set_destination(self, destination):
+        self.destination = destination
+
+    def set_time(self, time):
+        self.time = time
+
+    def display_travel_info(self):
+        info_str = f"Source: {self.source}\nDestination: {self.destination}\nFlight Time: {self.time}:00"
+        return info_str
+
+
+print("No. of Traveller =", Travel.count)
+print("=======================")
+t1 = Travel("Dhaka", "India")
+print(t1.display_travel_info())
+print("=======================")
+t2 = Travel("Kuala Lampur", "Dhaka")
+t2.set_time(23)
+print(t2.display_travel_info())
+print("=======================")
+t3 = Travel("Dhaka", "New_Zealand")
+t3.set_time(15)
+t3.set_destination("Germany")
+print(t3.display_travel_info())
+print("=======================")
+t4 = Travel("Dhaka", "India")
+t4.set_time(9)
+t4.set_source("Malaysia")
+t4.set_destination("Canada")
+print(t4.display_travel_info())
+print("=======================")
+print("No. of Traveller =", Travel.count)

Concept 6 – Static Class Variables and Methods/Problem 05.py

@@ -0,0 +1,32 @@
+class Employee:
+    def __init__(self, name, workingPeriod):
+        self.name = name
+        self.workingPeriod = workingPeriod
+
+    @classmethod
+    def employeeByJoiningYear(cls, name, year):
+        workingPeriod = 2021 - year
+        return cls(name, workingPeriod)
+
+    @staticmethod
+    def experienceCheck(workingPeriod, gender):
+        if workingPeriod < 3:
+            if gender == "male":
+                return "He is not experienced"
+            else:
+                return "She is not experienced"
+        else:
+            if gender == "male":
+                return "He is experienced"
+            else:
+                return "She is experienced"
+
+
+employee1 = Employee("Dororo", 3)
+employee2 = Employee.employeeByJoiningYear("Harry", 2016)
+print(employee1.workingPeriod)
+print(employee2.workingPeriod)
+print(employee1.name)
+print(employee2.name)
+print(Employee.experienceCheck(2, "male"))
+print(Employee.experienceCheck(3, "female"))

Concept 6 – Static Class Variables and Methods/Problem 06.py

@@ -0,0 +1,26 @@
+class Laptop:
+
+    laptopCount = 0
+
+    def __init__(self, name, count):
+        self.name = name
+        self.count = count
+        Laptop.laptopCount += self.count
+
+    @classmethod
+    def advantage(cls):
+        print("Laptops are portable")
+
+    @classmethod
+    def resetCount(cls):
+        Laptop.laptopCount = 0
+
+
+lenovo = Laptop("Lenovo", 5)
+dell = Laptop("Dell", 7)
+print(lenovo.name, lenovo.count)
+print(dell.name, dell.count)
+print("Total number of Laptops", Laptop.laptopCount)
+Laptop.advantage()
+Laptop.resetCount()
+print("Total number of Laptops", Laptop.laptopCount)

Concept 6 – Static Class Variables and Methods/Problem 07.py

@@ -0,0 +1,51 @@
+class Cat:
+
+    Number_of_cats = 0
+
+    def __init__(self, color, acitvity):
+        self.color = color
+        self.activity = acitvity
+
+        Cat.Number_of_cats += 1
+
+    def printCat(self):
+        print(f"{self.color} cat is {self.activity}")
+
+    def changeColor(self, color):
+        self.color = color
+
+    @classmethod
+    def no_parameter(cls):
+        color = "White"
+        activity = "sitting"
+        return cls(color, activity)
+
+    @classmethod
+    def first_parameter(cls, color):
+        activity = "sitting"
+        return cls(color, activity)
+
+    @classmethod
+    def second_parameter(cls, activity):
+        color = "Grey"
+        return cls(color, activity)
+
+
+print("Total number of cats:", Cat.Number_of_cats)
+c1 = Cat.no_parameter()
+c2 = Cat.first_parameter("Black")
+c3 = Cat("Brown", "jumping")
+c4 = Cat("Red", "purring")
+c5 = Cat.second_parameter("playing")
+print("=======================")
+c1.printCat()
+c2.printCat()
+c3.printCat()
+c4.printCat()
+c5.printCat()
+c1.changeColor("Blue")
+c3.changeColor("Purple")
+c1.printCat()
+c3.printCat()
+print("=======================")
+print("Total number of cats:", Cat.Number_of_cats)

Concept 6 – Static Class Variables and Methods/Problem 08.py

@@ -0,0 +1,54 @@
+from math import pi
+
+
+class Cylinder:
+
+    radius = 5
+    height = 18
+
+    def __init__(self, radius, height):
+
+        print(f"Default radius = {Cylinder.radius} and height = {Cylinder.height}.")
+
+        Cylinder.radius = radius
+        Cylinder.height = height
+
+        print(f"Updated: radius = {Cylinder.radius} and height = {Cylinder.height}.")
+
+    @classmethod
+    def swap(cls, height, radius):
+        return cls(radius, height)
+
+    @classmethod
+    def changeFormat(cls, info_str):
+        radius, height = info_str.split("-")
+        radius = float(radius)
+        height = float(height)
+        return cls(radius, height)
+
+    @staticmethod
+    def area(radius, height):
+        area = 2 * pi * (radius ** 2) + 2 * pi * radius * height
+        print(f"Area: {area}")
+
+    @staticmethod
+    def volume(radius, height):
+        volume = pi * (radius ** 2) * height
+        print(f"Volume: {volume}")
+
+
+c1 = Cylinder(0, 0)
+Cylinder.area(c1.radius, c1.height)
+Cylinder.volume(c1.radius, c1.height)
+print("===============================")
+c2 = Cylinder.swap(8, 3)
+c2.area(c2.radius, c2.height)
+c2.volume(c2.radius, c2.height)
+print("===============================")
+c3 = Cylinder.changeFormat("7-13")
+c3.area(c3.radius, c3.height)
+c3.volume(c3.radius, c3.height)
+print("===============================")
+Cylinder(0.3, 5.56).area(Cylinder.radius, Cylinder.height)
+print("===============================")
+Cylinder(3, 5).volume(Cylinder.radius, Cylinder.height)

Concept 6 – Static Class Variables and Methods/Problem 09.py

@@ -0,0 +1,55 @@
+class Student:
+
+    total_student = 0
+    brac_student = 0
+    other_student = 0
+
+    def __init__(self, name, dept, institute="BRAC University"):
+        self.name = name
+        self.dept = dept
+        self.institute = institute
+
+        if institute == "BRAC University":
+            Student.brac_student += 1
+        else:
+            Student.other_student += 1
+
+        Student.total_student += 1
+
+    def individualDetail(self):
+        print(f"Name: {self.name}")
+        print(f"Department: {self.dept}")
+        print(f"Institution: {self.institute}")
+
+    @classmethod
+    def printDetails(cls):
+        print(f"Total Student(s): {cls.total_student}")
+        print(f"BRAC University Student(s): {cls.brac_student}")
+        print(f"Other Institution Student(s): {cls.other_student}")
+
+    @classmethod
+    def createStudent(cls, name, dept, institute=None):
+        if institute == None:
+            return cls(name, dept)
+        else:
+            return cls(name, dept, institute)
+
+
+Student.printDetails()
+print("#########################")
+mikasa = Student("Mikasa Ackerman", "CSE")
+mikasa.individualDetail()
+print("------------------------------------------")
+Student.printDetails()
+print("========================")
+harry = Student.createStudent(
+    "Harry Potter", "Defence Against Dark Arts", "Hogwarts School"
+)
+harry.individualDetail()
+print("-------------------------------------------")
+Student.printDetails()
+print("=========================")
+levi = Student.createStudent("Levi Ackerman", "CSE")
+levi.individualDetail()
+print("--------------------------------------------")
+Student.printDetails()