07. 😟기존 코드 #07. class PhoneBook: contacts={'name': None, 'mobile': None, 'office': None, 'email': None} def __init__(self): self={} def add(self, name, mobile=None, office=None, email=None): self.contacts['name']=name self.contacts['mobile']=mobile self.contacts['office']=office self.contacts['email']=email def __str__(self): return f"{self.contacts['name']}\noffice phone: {self.contacts['office..