import pytz


def parse_timezone(tz):
  """
  Parse a timezone description into a tzinfo object
  >>> parse_timezone("America/Los Angeles")
  <DstTzInfo 'America/Los_Angeles' PST-1 day, 16:00:00 STD>
  >>> parse_timezone("America/Los_Angeles")
  <DstTzInfo 'America/Los_Angeles' PST-1 day, 16:00:00 STD>
  """
  return pytz.timezone(tz.replace(" ","_"))