utils.py

import json
import logging

# Setting up logging configuration
logging.basicConfig(level=logging.INFO)

class InvalidInputError(Exception):
    pass

class ProcessingError(Exception):
    pass


def safe_divide(a, b):
    try:
        if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
            raise InvalidInputError('Both inputs must be integers or floats.')
        result = a / b
    except ZeroDivisionError:
        logging.error('Division by zero. Returning None.')
        return None
    except InvalidInputError as e:
        logging.error(f'Invalid input: {e}')
        return None
    except Exception as e:
        logging.critical(f'Unexpected error: {e}')
        raise ProcessingError('An unexpected error occurred.')
    else:
        logging.info(f'Division successful: {result}')
        return result


def read_json_file(file_path):
    try:
        with open(file_path, 'r') as file:
            data = json.load(file)
    except FileNotFoundError:
        logging.error(f'File not found: {file_path}')
        return None
    except json.JSONDecodeError:
        logging.error(f'Error decoding JSON from file: {file_path}')
        return None
    else:
        logging.info(f'File read successfully: {file_path}')
        return data


def process_data(data):
    if not isinstance(data, list):
        logging.error('Invalid data type, expected a list.')
        return None
    processed = []
    for item in data:
        if not isinstance(item, dict):
            logging.warning(f'Skipped item: {item}')
            continue
        processed.append(item)
    return processed