Question

Revise Exercise 4 in Lab 7: this time, you must check whether each staff record from the csv file has a staff id. If a staff record from the file doesn't have a staff id. Raise an Exception. In your program, you should catch FileNotFoundError as well as the exception your program raised due to missing staff id. If the staff id is missing from the record, the whole record is ignored.

Answer 1

The question involves creating a Python program to check for staff IDs in a CSV file's records and raise an exception if a staff ID is missing, while also handling a potential FileNotFoundError. A custom exception class is defined and used in a try-except block to check each record and handle errors appropriately.

Step-by-step explanation:

To revise Exercise 4 in Lab 7, your Python program needs to read a CSV file containing staff records and check for the presence of a staff ID in each record. You should handle exceptions for both a missing staff ID and a FileNotFoundError. Here is a basic structure on how your code should look:

import csv
class MissingStaffIDException(Exception):
pass
try:
with open('staff_records.csv', 'r') as file:
csv_reader = csv.reader(file)
for row in csv_reader:
if not row[0]: # Assuming staff ID is in the first column
raise MissingStaffIDException('Staff ID is missing')
# Process the staff record
except FileNotFoundError:
print('The file was not found.')
except MissingStaffIDException as e:
print(e)

In this snippet, MissingStaffIDException is a custom exception class for handling missing staff IDs. The try-except block attempts to open the file and then iterates through each record. If the staff ID is missing, it raises the MissingStaffIDException, which is caught and handled in a separate except block. If the CSV file is not found, the FileNotFoundError is caught and handled as well. It is important to understand that by ignoring records without a staff ID, you're ensuring data integrity and consistency in your program's operations.