CRS object not scriptable

[tynowell]

Nice, clean extension. Very Nice! However, I've had no luck with it so far. I get a type error when to_postgis is called.

... in _extract_srid_int_from_crs
    return int(self._obj.crs['init'].replace('epsg:', ''))
TypeError: 'CRS' object is not subscriptable

My pandas dataframe is in this format:

    id  x           y
0   0   201450.14   6580070.72
1   1   196845.05   6521476.19
2   2   196840.15   6581111.00

Which is then converted to a geopandas dataframe:

gdf = geopandas.GeoDataFrame(df['id'], crs=6173, geometry=geopandas.points_from_xy(df.x, df.y))

gdf.crs is a pyproj.crs.crs.CRS type which is not scriptable. Calling the crs attribute returns:

<Compound CRS: EPSG:6173>
Name: ETRS89 / UTM zone 33 + NN54 height
Axis Info [cartesian|vertical]:
- E[east]: Easting (metre)
- N[north]: Northing (metre)
- H[up]: Gravity-related height (metre)
Area of Use:
- name: Norway - onshore - 12°E to 18°E
- bounds: (12.0, 59.88, 18.01, 69.68)
Datum: European Terrestrial Reference System 1989
- Ellipsoid: GRS 1980
- Prime Meridian: Greenwich
Sub CRS:
- ETRS89 / UTM zone 33N
- NN54 height

to_postgis is then called:

gdf.postgis.to_postgis(con=conn, table_name='test', geometry='Point')

I tried adding srid=6173 as a parameter but that is overwritten in the call anyway.

As mentioned in #7, I think this would a great addition to geopandas. If I have time, I'll create a pull request with a fix.

[tynowell]

11 submitted with possible fix.