from collections import Iterable, Iterator

class EmployeesIterator(Iterator):
    def __init__(self, employees, head_count):
        self._employees = employees
        self._head_count = head_count
        self._emp_id = 0
        
    def __iter__(self):
        return self
    
    def __next__(self):
        if self._emp_id < self._head_count:
            self._emp_id += 1
            return self._employees[self._emp_id]
        else:
            raise StopIteration

class Employees(Iterable):
    _employees = {}
    _head_count = 0
    _emp_id = 0
    
    def add_employee(self, emp_id, employee):
        self._head_count += 1
        self._emp_id = emp_id
        self._employees[self._emp_id] = employee
        
    def __iter__(self):
        return EmployeesIterator(self._employees, self._head_count)

test_employees = ['Ashutosh', 'Bipender', 'Sameer', 'Abhijit']

employees = Employees()

for i, emp in enumerate(test_employees):
    employees.add_employee(i + 1, emp)

class Employees(Iterable):
    _employees = {}
    _head_count = 0
    _emp_id = 0
    
    def add_employee(self, emp_id, employee):
        self._head_count += 1
        self._emp_id = emp_id
        self._employees[self._emp_id] = employee
        
    def __iter__(self):    # Or - return (e for e in self._employees.values())
        for i in range(self._head_count):
            yield self._employees[i + 1]

employees = Employees()

for i, emp in enumerate(test_employees):
    employees.add_employee(i + 1, emp)