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mohanakrishnavhmohanakrishnavh
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OOPs
1 parent 2186a69 commit 1a17967

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lines changed

‎OOPs/01-FirstClass.py

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class Employee:
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def __init__(self, first, last, pay):
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self.first = first
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self.last = last
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self.pay = pay
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self.email = first+"."+last+"@company.com"
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def fullname(self):
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return '{0} {1}'.format(self.first, self.last)
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emp_1 = Employee("Pranam", "Thomas", 50000)
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emp_2 = Employee("Arshi", "Shiyal", 60000)
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# Employee Objects
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#print(emp_1)
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#print(emp_2)
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print(Employee.fullname(emp_1))
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print(emp_2.fullname())

‎OOPs/02-ClassInstanceVariables.py

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class Employee:
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raise_amount = 1.04
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num_of_emps = 0
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def __init__(self, first, last, pay):
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self.first = first
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self.last = last
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self.pay = pay
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self.email = first+"."+last+"@company.com"
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Employee.num_of_emps += 1
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def fullname(self):
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return '{0} {1}'.format(self.first, self.last)
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def apply_raise(self):
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# we cal also use Employee.raise_amount
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self.pay = int(self.pay * self.raise_amount)
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emp_1 = Employee("Pranam", "Thomas", 50000)
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emp_2 = Employee("Arshi", "Shiyal", 60000)
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print(Employee.raise_amount)
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print(emp_1.raise_amount)
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print(emp_2.raise_amount)
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# Namespace
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print(emp_1.__dict__)
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print(Employee.__dict__)
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# Changes reflect to the class and all instances
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Employee.raise_amount = 1.05
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print(Employee.raise_amount)
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print(emp_1.raise_amount)
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print(emp_2.raise_amount)
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emp_1.raise_amount = 1.06
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print(emp_1.__dict__)
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print(Employee.raise_amount)
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print(emp_1.raise_amount)
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print(emp_2.raise_amount)
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print(emp_2.__dict__)
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# Employee count
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print(Employee.num_of_emps)

‎OOPs/03-StaticAndClassMethods.py

+79
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import datetime
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class Employee:
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raise_amount = 1.04
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num_of_emps = 0
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def __init__(self, first, last, pay):
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self.first = first
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self.last = last
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self.pay = pay
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self.email = first+"."+last+"@company.com"
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Employee.num_of_emps += 1
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def fullname(self):
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return '{0} {1}'.format(self.first, self.last)
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# regular method
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def apply_raise(self):
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# we cal also use Employee.raise_amount
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self.pay = int(self.pay * self.raise_amount)
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@classmethod
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def set_raise_amt(cls, amount):
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cls.raise_amount = amount
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@classmethod
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def from_string(cls, emp_str):
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first, last, pay = emp_str.split('-')
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return cls(first, last, pay)
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@staticmethod
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def is_workday(day):
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if day.weekday() == 5 or day.weekday() == 6:
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return False
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return True
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emp_1 = Employee("Pranam", "Thomas", 50000)
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emp_2 = Employee("Arshi", "Shiyal", 60000)
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print(Employee.raise_amount)
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print(emp_1.raise_amount)
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print(emp_2.raise_amount)
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Employee.set_raise_amt(1.06)
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print(Employee.raise_amount)
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print(Employee.__dict__)
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print(emp_1.raise_amount)
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print(emp_1.__dict__)
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print(emp_2.raise_amount)
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print(emp_2.__dict__)
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print()
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emp_str_1 = 'John-Doe-70000'
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emp_str_2 = 'Steve-Smith-30000'
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emp_str_3 = 'Jane-Doe-90000'
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first, last, pay = emp_str_1.split('-')
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new_emp_1 = Employee(first, last, pay)
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print(new_emp_1.email)
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print(new_emp_1.pay)
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print()
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# class methods as alternate constructor
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new_emp_2 = Employee.from_string(emp_str_2)
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new_emp_3 = Employee.from_string(emp_str_3)
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print(new_emp_2.email)
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print(new_emp_2.pay)
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print()
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print(new_emp_3.email)
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print(new_emp_3.pay)
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print()
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my_date = datetime.date(2016, 7, 10)
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print(Employee.is_workday(my_date))
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‎OOPs/04-Inheritance.py

+110
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class Employee:
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raise_amount = 1.04
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num_of_emps = 0
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def __init__(self, first, last, pay):
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self.first = first
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self.last = last
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self.pay = pay
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self.email = first+"."+last+"@company.com"
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Employee.num_of_emps += 1
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def fullname(self):
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return '{0} {1}'.format(self.first, self.last)
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def apply_raise(self):
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# we cal also use Employee.raise_amount
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self.pay = int(self.pay * self.raise_amount)
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@classmethod
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def set_raise_amt(cls, amount):
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cls.raise_amount = amount
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@classmethod
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def from_string(cls, emp_str):
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first, last, pay = emp_str.split('-')
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return cls(first, last, pay)
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@staticmethod
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def is_workday(day):
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if day.weekday() == 5 or day.weekday() == 6:
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return False
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return True
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class Developer(Employee):
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raise_amount = 1.10
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def __init__(self, first, last, pay, prog_lang):
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super().__init__(first, last, pay)
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# Employee.__init__(self, first, last, pay)
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self.prog_lang = prog_lang
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class Manager(Employee):
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def __init__(self, first, last, pay, employees=None):
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super().__init__(first, last, pay)
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# Employee.__init__(self, first, last, pay)
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if employees is None:
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self.employees = []
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else:
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self.employees = employees
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def add_emp(self, emp):
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if emp not in self.employees:
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self.employees.append(emp)
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def remove_emp(self, emp):
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if emp in self.employees:
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self.employees.remove(emp)
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def print_emps(self):
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if len(self.employees) == 0:
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print("No Employees.")
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else:
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for emp in self.employees:
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print("-->", emp.fullname())
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# Before defining the Developer class
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dev_1 = Developer("Pranam", "Thomas", 50000, "NULL")
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dev_2 = Developer("Arshi", "Shiyal", 60000, "NULL")
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# print(dev_1.email)
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# print(dev_2.email)
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# print(help(Developer))
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print(dev_1.pay)
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dev_1.apply_raise()
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print(dev_1.pay)
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print()
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dev_3 = Developer("Shyam", "Sundar", 50000, "Python")
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dev_4 = Developer("Arun", "Kumar", 60000, "Java")
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print(dev_3.email)
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print(dev_3.prog_lang)
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print(dev_4.email)
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print(dev_4.prog_lang)
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print()
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mgr_1 = Manager("Sue", "Smith", 90000, [dev_1])
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print(mgr_1.email)
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mgr_1.print_emps()
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print()
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mgr_1.add_emp(dev_2)
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mgr_1.add_emp(dev_3)
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mgr_1.print_emps()
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print()
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mgr_1.remove_emp(dev_2)
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mgr_1.print_emps()
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print()
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print(isinstance(mgr_1, Manager))
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print(isinstance(mgr_1, Employee))
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print(isinstance(mgr_1, Developer))
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print()
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print(issubclass(Manager, Employee))
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print(issubclass(Developer, Employee))
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print(issubclass(Manager, Developer))

‎OOPs/05-SpecialMethods.py

+61
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class Employee:
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raise_amount = 1.04
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num_of_emps = 0
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def __init__(self, first, last, pay):
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self.first = first
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self.last = last
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self.pay = pay
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self.email = first+"."+last+"@company.com"
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Employee.num_of_emps += 1
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def fullname(self):
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return '{0} {1}'.format(self.first, self.last)
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def apply_raise(self):
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# we cal also use Employee.raise_amount
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self.pay = int(self.pay * self.raise_amount)
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def __repr__(self):
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'''
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Returns unambiguous representation of the object. Used for Debugging & logging.
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'''
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return "Employee('{0}','{1}',{2})".format(self.first, self.last, self.pay)
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def __str__(self):
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'''
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Returns a more readable form for the end user
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'''
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return "{0} - {1}".format(self.fullname(), self.email)
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def __add__(self, other):
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if isinstance(other, Employee):
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return self.pay + other.pay
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return NotImplemented
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def __len__(self):
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return len(self.fullname())
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emp1 = Employee("Shyam", "Sundar", 50000)
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emp2 = Employee("Arun", "Kumar", 60000)
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print(emp1) # will call __str__ which will call __repr__ if it is empty
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print(repr(emp1))
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print(str(emp1))
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print(emp2.__repr__())
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print(emp2.__str__())
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print(1+2)
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print(int.__add__(1, 2))
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print(str.__add__('a', 'b'))
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print(emp1+emp2)
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print(len('test'))
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print(str.__len__('test'))
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print(emp1.fullname())
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print(len(emp1))

‎OOPs/06-PropertyDecorators.py

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class Employee:
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raise_amount = 1.04
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num_of_emps = 0
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def __init__(self, first, last, pay):
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self.first = first
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self.last = last
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self.pay = pay
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Employee.num_of_emps += 1
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@property
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def email(self):
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return '{0}.{1}@company.com'.format(self.first, self.last)
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@property
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def fullname(self):
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return '{0} {1}'.format(self.first, self.last)
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@fullname.setter
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def fullname(self, name):
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first, last = name.split(' ')
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self.first = first
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self.last = last
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@fullname.deleter
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def fullname(self):
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print('Delete Name!')
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self.first = None
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self.last = None
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def apply_raise(self):
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# we cal also use Employee.raise_amount
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self.pay = int(self.pay * self.raise_amount)
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emp1 = Employee("Shyam", "Sundar", 50000)
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emp2 = Employee("Arun", "Kumar", 60000)
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emp1.first = 'Jim'
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print(emp1.first)
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print(emp1.last)
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print(emp1.email)
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print(emp1.fullname)
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emp1.fullname = 'Corey Schafar'
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print(emp1.fullname)
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del emp1.fullname
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print(emp1.fullname)

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