[Python] Python UnpicklingError: invalid load key, '\xef'

I am new to python and came across a object deserialisation issue (unpickling) while testing a program on jupyter lab.

I am trying to serialize and deserialize object of Employee class as below.

- Definition of Employee class:

class Employee:
def __init__(self, id, name, salary):
self.id = id
self.name = name
self.salary = salary


def display(self):
print('{:5d} -- {:20s} -- {:10.2f}'.format(self.id, self.name, self.salary))


- Code to pickle Employee Object:

import pickle

file = open('employee-data.csv', 'wb')

n = int(input('How many employees ?'))

for i in range(n):
id = int(input('Enter the Employee id:'))
name = input('Enter the Employee name:')
salary = float(input('Enter the Employee salary:'))

ob = Employee(id, name, salary)

pickle.dump(ob,file)

file.close()


- Code to unpickle Employee Object:

import pickle

file2 = open('employee-data.csv', 'rb')

print('Employee Details ....')

while True:
try:
obj = pickle.load(file2)
obj.display()
except EOFError:
print('End of File Reached ...')
break

file2.close()


Error:

> ---------
UnpicklingError Traceback (most recent call
> last) Cell In[5], line 9
> 7 while True:
> 8 try:
> ----> 9 obj = pickle.load(file2)
> 10 obj.display()
> 11 except EOFError:
>
> UnpicklingError: invalid load key, '\xef'.


Following snapshot shows that the code to serialize the object has run successfully. And the file was created.



What can be the problem here ? Any suggestions/feedbacks appreciated.

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