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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def populate_user(self, request, sociallogin, data):
 """ Hook that can be used to further populate the user instance. For convenience, we populate several common fields. Note that the user instance being populated represents a suggested User instance that represents the social user that is in the process of being logged in. The User instance need not be completely valid and conflict free. For example, verifying whether or not the username already exists, is not a responsibility. """

        username = data.get('username')
        first_name = data.get('first_name')
        last_name = data.get('last_name')
        email = data.get('email')
        name = data.get('name')
        user = sociallogin.user
        user_username(user, username or '')
        user_email(user, valid_email_or_none(email) or '')
        name_parts = (name or '').partition(' ')
        user_field(user, 'first_name', first_name or name_parts[0])
        user_field(user, 'last_name', last_name or name_parts[2])
        return user