no attribute 'utcoffset'

[oe8bck]

Hi,

I would like to make a track file out of LAT/LON and TIME data. The question is, what I did wrong in the format of the time data.

The original data is in UNIX time stamp and I did it this way:

In [9]: p['time']                                                                                                                                                       
Out[9]: '1596957617 '
In [10]: ts=datetime.utcfromtimestamp(int(p['time'])).strftime('%Y-%m-%dT%H:%M:%SZ')
In [11]: ts                                                                                                                                                             
Out[11]: '2020-08-09T07:20:17Z'

This works in principle as can be seen e.g. in these statements:

In [13]: gpx_track.get_time_bounds()                                                                                                                                   
Out[13]: TimeBounds(start_time='2020-08-08T13:19:03Z', end_time='2020-08-09T07:20:17Z')
In [14]: gpxpy.gpx.GPXTrackPoint( 
    ...:             latitude=p['lat'], 
    ...:             longitude=p['lng'], 
    ...:             elevation=p['altitude'], 
    ...:             time=ts, 
    ...:             speed=data[0]['speed'], 
    ...:             )                                                                                                                                                 
Out[14]: GPXTrackPoint(46.62583, 14.12600, elevation='444.00', time='2020-08-09T07:20:17Z', speed='0')

Then I create a track with this time formats with this kind of loop

    for p in data:
        ts=datetime.utcfromtimestamp(int(p['time'])).strftime('%Y-%m-%dT%H:%M:%SZ')
        gpx_segment.points.append(gpxpy.gpx.GPXTrackPoint(
            latitude=p['lat'],
            longitude=p['lng'],
            elevation=p['altitude'],
            time=ts,
            speed=p['speed'],
            ))

But if I want to get the XML string, I get these errors:

In [25]: %run json2gpx.py                                                                                                                                              
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
~/src/json2gpx/json2gpx.py in <module>
     47 
     48 # You can add routes and waypoints, too...
---> 49 print('Created GPX:', gpx.to_xml())

/usr/local/lib/python3.8/dist-packages/gpxpy/gpx.py in to_xml(self, version, prettyprint)
   2704             ]
   2705 
-> 2706         content = mod_gpxfield.gpx_fields_to_xml(
   2707             self, 'gpx', version,
   2708             custom_attributes={

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in gpx_fields_to_xml(instance, tag, version, custom_attributes, nsmap, prettyprint, indent)
    547                     body.append('>')
    548                     tag_open = False
--> 549                 xml_value = gpx_field.to_xml(value, version, nsmap,
    550                                              prettyprint=prettyprint,
    551                                              indent=indent + '  ')

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in to_xml(self, value, version, nsmap, prettyprint, indent)
    252             result = []
    253             for obj in value:
--> 254                 result.append(gpx_fields_to_xml(obj, self.tag, version,
    255                                                 nsmap=nsmap,
    256                                                 prettyprint=prettyprint,

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in gpx_fields_to_xml(instance, tag, version, custom_attributes, nsmap, prettyprint, indent)
    547                     body.append('>')
    548                     tag_open = False
--> 549                 xml_value = gpx_field.to_xml(value, version, nsmap,
    550                                              prettyprint=prettyprint,
    551                                              indent=indent + '  ')

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in to_xml(self, value, version, nsmap, prettyprint, indent)
    252             result = []
    253             for obj in value:
--> 254                 result.append(gpx_fields_to_xml(obj, self.tag, version,
    255                                                 nsmap=nsmap,
    256                                                 prettyprint=prettyprint,

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in gpx_fields_to_xml(instance, tag, version, custom_attributes, nsmap, prettyprint, indent)
    547                     body.append('>')
    548                     tag_open = False
--> 549                 xml_value = gpx_field.to_xml(value, version, nsmap,
    550                                              prettyprint=prettyprint,
    551                                              indent=indent + '  ')

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in to_xml(self, value, version, nsmap, prettyprint, indent)
    252             result = []
    253             for obj in value:
--> 254                 result.append(gpx_fields_to_xml(obj, self.tag, version,
    255                                                 nsmap=nsmap,
    256                                                 prettyprint=prettyprint,

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in gpx_fields_to_xml(instance, tag, version, custom_attributes, nsmap, prettyprint, indent)
    547                     body.append('>')
    548                     tag_open = False
--> 549                 xml_value = gpx_field.to_xml(value, version, nsmap,
    550                                              prettyprint=prettyprint,
    551                                              indent=indent + '  ')

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in to_xml(self, value, version, nsmap, prettyprint, indent)
    218             return '{}="{}"'.format(self.attribute, mod_utils.make_str(value))
    219         elif self.type_converter:
--> 220             value = self.type_converter.to_string(value)
    221         if self.tag:
    222             return mod_utils.to_xml(self.tag, content=value, escape=True,

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in to_string(self, time)
    129     def to_string(self, time: Optional[mod_datetime.datetime]) -> Optional[str]:
    130         if time:
--> 131             return format_time(time) if time else None
    132         return None
    133 

/usr/local/lib/python3.8/dist-packages/gpxpy/gpxfield.py in format_time(time)
     90 
     91 def format_time(time: mod_datetime.datetime) -> str:
---> 92     offset = time.utcoffset()
     93     if not offset or offset == 0:
     94         tz = 'Z'

AttributeError: 'str' object has no attribute 'utcoffset'

So what did I wrong? As this class is exactly what I am looking for, any hint to get rid of this error is very welcome! (I've added an example as attachment)

test.py.zip KR, Christof

[tkrajina]

note that this line specifies what type should time be:

def format_time(time: mod_datetime.datetime) -> str:

Your tz iz a string ('2020-08-09T07:20:17Z'), it should be a datetime.datetime.

[oe8bck]

Thanks a lot for the hint! In the example I changed the 5th line to ts=datetime.fromtimestamp(1596892743) and now it works!

KR, Christof