Code from my GeoPython talk

geopython_meza_demo.rst

pip install meza

# readers
>>> from meza import io
>>>
>>> records = io.read('kibo_peak.geojson')
>>> next(records)
{'id': 11,
 'lon': Decimal('37.353333'),
 'lat': Decimal('-3.075833'),
 'peak': 'kibo',
 'type': 'Point'}

# merging
>>> from meza import convert as cv
>>>
>>> paths = ('uhuru_peak.geojson', 'kibo_peak.geojson')
>>> records = io.join(*paths)
>>> geojson = cv.records2geojson(records)
>>> io.write('meza_peaks.geojson', geojson)
>>>
>>> # read in the geojson file we just wrote, 
>>> # and write it out as a csv file
>>> records = io.read('meza_peaks.geojson')
>>> csv = cv.records2csv(records)
>>> io.write('meza_peaks.csv', csv)

# split by id
>>> from meza import process as pr
>>>
>>> records = io.read('meza_peaks.geojson')
>>> groups = pr.group(records, 'id')
>>> name = 'peak_{}.geojson'
>>>
>>> for _id, _records in groups:
...     f = cv.records2geojson(_records)
...     io.write(name.format(_id), f)

# extract by id
>>> records = io.read('peaks.geojson')
>>> groups = pr.group(records, 'id')
>>> group = next(g for g in groups if g[0] == 11)
>>> geojson = cv.records2csv(group[1])
>>> io.write('id_11_peaks.csv', geojson)

# extract by id v2
>>> from urllib.request import urlopen
>>>
>>> BASE = 'https://raw.githubusercontent.com'
>>> REPO = 'drei01/geojson-world-cities'
>>> path = '{}/{}/master/cities.geojson'
>>> url = path.format(BASE, REPO)
>>> f = urlopen(url)
>>> records = io.read_geojson(f)
>>> next(records)
{'NAME': 'TORSHAVN',
 'id': None,
 'lat': Decimal('62.015167236328125'),
 'lon': Decimal('-6.758638858795166'),
 'pos': 0,
 'type': 'Polygon'}
>>> clean = (r for r in records if r.get('NAME'))
>>> splits = pr.split(clean, 'NAME', chunksize=1024)
>>> b_splits = (s for s in splits if 'BASE' in s[1])
>>> name = 'base_cities.csv'
>>>
>>> for pos, split in enumerate(b_splits):
...     f = cv.records2csv(split[0], skip_header=pos)
...     io.write(name, f, mode='ab+')      

kibo_peak.geojson

uhuru_peak.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "peak": "uhuru",
        "id": 10
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          37.350666,
          -3.066465
        ]
      }
    }
  ]
}