processor.py

import json
from datetime import datetime

class DataProcessor:
    def __init__(self, data):
        self.data = data

    def to_json(self):
        try:
            return json.dumps(self.data)
        except (TypeError, OverflowError) as e:
            return f"Error converting to JSON: {e}"

    def from_json(self, json_str):
        try:
            self.data = json.loads(json_str)
            return self.data
        except json.JSONDecodeError as e:
            return f"Error decoding JSON: {e}"

    def add_timestamp(self):
        self.data['timestamp'] = datetime.now().isoformat()

    def normalize_keys(self):
        self.data = {k.lower().replace(' ', '_'): v for k, v in self.data.items()}

    def get_summary(self):
        return {k: v for k, v in self.data.items() if isinstance(v, (int, float))}

# Example usage:
# processor = DataProcessor({'Name': 'Example', 'Value': 42})
# processor.add_timestamp()
# print(processor.to_json())