parsers.py 文件源码

def gpx_parser(fh):
  it = ElementTree.iterparse(fh, events=('start','end'))
  # look for the start gpx tag to fail fast
  for event, elem in it:
    if event == 'start' and elem.tag.endswith('}gpx'):
      break
  else:
    raise ValueError('Not a gpx file: %s' % fh.name)

  # do the main parse
  for event, elem in it:
    if event == 'end' and elem.tag.endswith('}trkpt'):
      latlon = (float(elem.attrib['lat']),
                float(elem.attrib['lon']))
      elev = np.nan
      time = None
      for child in elem:
        tag_name = child.tag.rsplit('}', 1)[1]
        if tag_name == 'ele':
          elev = float(child.text)
        elif tag_name == 'time':
          time = child.text
      yield latlon, time, elev
      elem.clear()