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I am looking for the equivalent argument to pandas.read_csv(index_col='column') in the geopandas.read_file() function. My goal is to read a shapefile and specify the index column. However, the following does not set any index column and returns the same GeoDataframe as calling the function without the argument:

import geopandas as gpd

gdf = gpd.read_file('test.shp', index_col='column')

The documentation of the read_file function does not list index_col as an argument and states that one can specify keyword arguments that are going to be passed to the fiona.open function (but not to any pandas.read_* function).

A workaround is to use the set_index() method after reading the file:

import geopandas as gpd

gdf = gpd.read_file('test.shp')
gdf = gdf.set_index('column')

# or

gdf = gpd.read_file('test.shp').set_index('column')

However, it feels like specifying the index should be possible directly from the read_file function.

2
  • It is not. Your workaround with set_index() is the best option so far. May 17, 2020 at 17:19
  • Feel free to post your comment as an answer and I will accept it. May 17, 2020 at 17:32

1 Answer 1

6

GeoPandas does not have such an option (as of 0.7.0 and likely 0.8.0), so the workaround with .set_index is the best option. If it did have the option, it would likely just do the same under the hood, so there will be no difference anyway.

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