human
Complete the below
def StringSizer(field_number, is_repeated, is_packed):

    ''''Returns a sizer for a string field.'
    '''
 Can you provide a the Python program you requested?
assistant
#Here is the Python program you requested.
    tag_size = _TagSize(field_number)
    local_VarintSize = _VarintSize
    local_len = len
    assert (not is_packed)
    if is_repeated:
        def RepeatedFieldSize(value):
            result = (tag_size * len(value))
            for element in value:
                l = local_len(element.encode('utf-8'))
                result += (local_VarintSize(l) + l)
            return result
        return RepeatedFieldSize
    else:
        def FieldSize(value):
            l = local_len(value.encode('utf-8'))
            return ((tag_size + local_VarintSize(l)) + l)
        return FieldSize