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from datetime import datetime

class Employee:

""" Employee class """

emp_serial = 1001

pf_serial = 101

@staticmethod

def _generate_pf_serial():

pf_number = Employee.pf_serial

Employee.pf_serial += 1

return pf_number

@classmethod

def _generate_emp_serial(cls):

emp_serial = cls.emp_serial

cls.emp_serial += 1

return emp_serial

def __init__(self, name, dept):

""" Parameterized constructor with default Arguments """

self.name = name

self.dept = dept

self.emp_id = Employee._generate_emp_serial()

self.pf_number = Employee._generate_pf_serial()

@classmethod

def create_emp_dummy(cls):

return cls(None, None)

@classmethod

def create_emp_data_scientist(cls, name, dept='Data Science'):

return cls(name, dept)

def __str__(self):

return 'Employee({}, {}, {}, {})'.format(self.emp_id, self.name, self.dept, self.pf_number)

# Creating an Employee instance

print('------------------- Employee - Ravi ----------------------')

emp_ravi = Employee('Ravi', 'Data Engineering')

print(emp_ravi)

print()

# Creating an Employee instance without name and dept

print('------------------- Employee - Without Name and Dept ---------------------')

emp_dummy = Employee.create_emp_dummy()

print(emp_dummy)

print()

# Creating an Employee instance without name and dept

print('------------------- Employee - Data Scientist ---------------------')

emp_roshith = Employee.create_emp_data_scientist('Ravi')

print(emp_roshith)

print()