new_contents: #!/usr/bin/python
  
  import os.path
  import pickle
  import yaml
  config = yaml.safe_load(open("config.yml"))
  contacts_filename = config["contacts"]["filename"]
  
  class Contacts:
  	"""An address book, with entries for people."""
  
  	def get_contacts(self):
  		if (os.path.isfile(contacts_filename)):
  			return pickle.load(open(contacts_filename, "rb"))
  		else:
  			return []
  
  	def save_contacts(self, contacts):
  		pickle.dump(contacts, open(contacts_filename, "wb"))
  
  	def add_contact(self, contact):
  		contacts = self.get_contacts()
  		contacts.append(contact)
  		self.save_contacts(contacts)
  
  	def delete_contact(self, contact):
  		contacts = self.get_contacts()
  		for candidate in contacts:
  			if candidate.name == contact.name and candidate.number == contact.number:
  				contacts.remove(candidate)
  				self.save_contacts(contacts)
  				return True
  		return False
  
  	def find_contact_by_number(self, number):
  		for contact in self.get_contacts():
  			if contact.number == number:
  				return contact
  		return None
  
  	def find_contact_by_name(self, name):
  		for contact in self.get_contacts():
  			if contact.name == name:
  				return contact
  		return None
  
  class Contact:
  	""" A data structure encapsulating a person. """
  
  	# default data
  	name = "Nobody"
  	number = "+19856552500"			# rickroll
  
  	def __init__(self, name, number):
  		self.name = name
  		self.number = number
  		
subject: add contacts