human
Solve the following python programming problem given the following code:
def _get_user_case_fields(commcare_user) : 
    def valid_element_name(name) : 
        try : 
            ElementTree.fromstring ('<{}/>'.format (name)) 
            return True 
except ElementTree.ParseError : 
            return False 
fields = { k : v for (k, v) in commcare_user.user_data.items () if valid_element_name (k) } 
    fields.update ({ 
        'name' : (commcare_user.name or commcare_user.raw_username), 
        'username' : v.raw_username, 
        'email' : commcare_user.email, 
        'language' : (commcare_user.language or ''), 
        'phone_number' : (commcare_user.phone_number or ''), 
}) 
    return fields 

    
    

    Fix the buggy line: 'username' : v.raw_username ,
assistant
#Here is Python program to fix the buggy line: 'username' : v.

'username' : commcare_user.raw_username ,