Implement employee management system in Python

Employee Management System/employeeManagement.py

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+from tabulate import tabulate
+
+class employeeManager():
+
+    def __init__(self):
+        self.employees={101: {'name': 'Satya', 'age': 27, 'department': 'HR', 'salary': 50000}}
+
+    def employeeExist(self,emp_id):
+        return emp_id in self.employees
+
+    def postiveInteger(self,value):
+        return isinstance(value, int) and value > 0
+
+    def acceptValidNumber(self,prompt):
+         value=input(prompt)
+         while True:
+              try:
+                    value=int(value)
+                    if self.postiveInteger(value):
+                        return value
+              except ValueError:
+                   value=input("Invalid input. "+prompt)
+
+
+    def acceptValidAge(self):
+        age=self.acceptValidNumber("Enter age (between 1 and 120) : ")
+        while  0>age>120:
+            age=self.acceptValidNumber("Invalid age. Enter age (between 1 and 120) : ")
+            print(age)
+
+        return age
+
+    def add_employee(self,emp_id,name,age,department,salary):
+        if not self.employeeExist(emp_id):
+            self.employees[emp_id]={"name":name,
+                                    "age":age,
+                                    "department":department,
+                                    "salary":salary}
+            print(f"Employee {name} with id {emp_id} added successfully")
+        else :
+            print("Employee already exists")
+
+    def view_employees(self):
+        if self.employees:
+            table=[[emp_id]+list(info.values()) for emp_id,info in self.employees.items()]
+            print(tabulate(table, headers=["ID", "Name", "Age", "Department", "Salary"], tablefmt="grid"))
+        else:
+            print("No employees available")
+
+    def search_employees(self,emp_id):
+        if self.employeeExist(emp_id):
+            table=[[emp_id]+list(self.employees[emp_id].values())]
+            print(tabulate(table, headers=["ID", "Name", "Age", "Department", "Salary"], tablefmt="grid"))
+        else:
+            print("No Employee Found")
+
+    def remove_employee(self,emp_id):
+        if self.employeeExist(emp_id):
+            del self.employees[emp_id]
+            print(f"Employee with id {emp_id} removed successfully")
+        else:
+            print("No Employee Found")
+
+    def update_employee(self,emp_id,name=None,age=None,department=None,salary=None):
+        if self.employeeExist(emp_id):
+            if name:
+                self.employees[emp_id]['name']=name
+            if age:
+                self.employees[emp_id]['age']=age
+            if department:
+                self.employees[emp_id]['department']=department
+            if salary:
+                self.employees[emp_id]['salary']=salary
+            print(f"\nEmployee with id {emp_id} updated successfully")
+        else:
+            print("No Employee Found")
+
+    def add_Handler(self):
+
+        emp_id=self.acceptValidNumber("Enter employee id : ")
+
+        while self.employeeExist(emp_id):
+                    emp_id=self.acceptValidNumber("Employee_id alreay Exist.Enter new id : ")
+
+        name=input("Enter name : ")
+        age=self.acceptValidAge()
+        dept=input("Enter department : ")
+        salary=self.acceptValidNumber("Enter salary : ")
+
+        while not self.postiveInteger(salary):
+                    salary=self.acceptValidNumber("Enter positive integer for salary : ")
+
+        self.add_employee(emp_id,name,age,dept,salary)  
+
+    def view_Handler(self):
+        self.view_employees()
+
+    def remove_Handler(self):
+        emp_id=self.acceptValidNumber("Enter employee id : ")
+        self.remove_employee(emp_id)
+
+    def search_Handler(self):
+        emp_id=self.acceptValidNumber("Enter employee id : ")
+        self.search_employees(emp_id)
+
+    def update_Handler(self):
+        emp_id=self.acceptValidNumber("Enter employee id : ")
+        if self.employeeExist(emp_id):
+            self.search_employees(emp_id)
+            while True:
+                            name=input("Enter new name (leave blank to keep current) : ")
+                            age_input=input("Enter new age (leave blank to keep current) : ")
+                            dept=input("Enter new department (leave blank to keep current) : ")
+                            salary_input=input("Enter new salary (leave blank to keep current) : ")
+                            try:
+                                age=int(age_input) if age_input else None
+                                salary=int(salary_input) if salary_input else None
+                                break
+                            except ValueError:
+                                print("Invalid inputs. Please enter valid values.")
+
+            self.update_employee(emp_id,name,age,dept,salary)
+
+        else:
+                    print("No Employee Found")
+
+    def main_menu(self):
+        print("-"*40)
+        print("-"*40)
+        option = input("1. Add Employee\n" \
+        "2. View All Employees\n" \
+        "3. Search for Employees\n" \
+        "4. Remove Employee\n" \
+        "5. Update Employee\n" \
+        "6. Exit \n---------------------\n---------------------\n")
+        try:
+            option=int(option)
+        except ValueError:
+            print("Invalid input. Please enter a valid option.")
+        return option
+
+    def main(self):
+
+        while True:
+
+            option=self.main_menu()
+            options={
+                1:self.add_Handler,
+                2:self.view_Handler,
+                3:self.search_Handler,
+                4:self.remove_Handler,
+                5:self.update_Handler
+            }
+
+            if option in options:
+                options[option]()
+
+            elif option == 6:
+                print("Exiting Employee Management System. Thank You!")
+                break
+            else:
+                print("Invalid Option")
+
+if __name__ =="__main__":
+    HR=employeeManager()
+    HR.main()
+