<｜begin▁of▁sentence｜>### Instruction:
As a dental hygienist, imagine you have a patient record system that stores appointment settings, such as appointment time, duration, and other details. If you need to update an appointment setting, like removing a specific patient's appointment time, how would you do that in the system?
### Response:
from configuration import Configuration

# Suppose we have a Configuration object
config = Configuration()

# Set an example key-value pair
config['example_key'] = 'example_value'

# We no longer need 'example_key', so we delete it
config.__delitem__('example_key')

# Check if 'example_key' is still present
print('example_key' in config)
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