<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def clear(self):
 """Erase the contents of the object"""

        self.country_code = None
        self.national_number = None
        self.extension = None
        self.italian_leading_zero = None
        self.number_of_leading_zeros = None
        self.raw_input = None
        self.country_code_source = CountryCodeSource.UNSPECIFIED
        self.preferred_domestic_carrier_code = None