def Display(self, value):
"""Returns the display string for a duration value, leading PT dropped."""
d = times.ParseDuration('{}s'.format(value))
s = times.FormatDuration(d)
if s.startswith('PT'):
s = s[2:].lower()
return s
def _ConvertProtoToIsoDuration(proto_duration_str):
"""Convert a given 'proto duration' string to an ISO8601 duration string."""
return times.FormatDuration(times.ParseDuration(proto_duration_str, True))