Copy¶
Copying a LayersSet is straightforward. Without parameters, a copy in ‘Memory’ is created.
lrs0 = LayersReader('D:/tmp/DEU_adm_shp/DEU_adm4.shp')
lrs1 = lrs0.copy() # the copy can be modified
lrs1.show(max_rows=6)
geom ID_0 ISO NAME_0 ID_1 NAME_1 ID_2 NAME_2 ID_3 NAME_3 ID_4 NAME_4 VARNAME_4 CCN_4 CCA_4 TYPE_4 ENGTYPE_4
0 Polygon 86 DEU Germany 1 Baden-Württemberg 1 Alb-Donau-Kreis 1 Allmendingen 1 Allmendingen None 0 084255001002 Gemeinde Town
1 Polygon 86 DEU Germany 1 Baden-Württemberg 1 Alb-Donau-Kreis 1 Allmendingen 2 Altheim None 0 084255001004 Gemeinde Town
2 Polygon 86 DEU Germany 1 Baden-Württemberg 1 Alb-Donau-Kreis 2 Blaubeuren 3 Berghülen None 0 084255002017 Gemeinde Town
... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...
11299 Polygon 86 DEU Germany 16 Thüringen 402 Weimarer Land 4672 Nordkreis Weimar 11300 Vippachedelhausen None 0 160715013092 Gemeinde Town
11300 Polygon 86 DEU Germany 16 Thüringen 402 Weimarer Land 4672 Nordkreis Weimar 11301 Wohlsborn None 0 160715013097 Gemeinde Town
11301 Polygon 86 DEU Germany 16 Thüringen 403 Weimar 4673 Weimar 11302 Weimar None 0 160550000000 Stadt Town
You can select fields to copy with the parameter ofields (output fields) followed by the layer number. ofields has a list field names.
In the following example, all fields from all layers are copied (in this case there is only one layer, since it is a shapefile):
lrs0 = LayersReader('D:/tmp/girs/DEU_adm_shp/DEU_adm4.shp')
lrs1 = lrs0.copy() # the copy can be modified
In the next example, only fields ‘NAME_4’ and ‘TYPE_4’ from the first layer are copied. If there were other layers, all their fields would be copied:
lrs0 = LayersReader('D:/tmp/girs/DEU_adm_shp/DEU_adm4.shp')
lrs1 = lrs0.copy(target='', ofields0=['NAME_4', 'TYPE_4']) # fields to keep
lrs1.show(max_rows=10)
geom NAME_4 TYPE_4
0 Polygon Allmendingen Gemeinde
1 Polygon Altheim Gemeinde
2 Polygon Berghülen Gemeinde
... ... ... ...
11299 Polygon Vippachedelhausen Gemeinde
11300 Polygon Wohlsborn Gemeinde
11301 Polygon Weimar Stadt
The copy is an instance of LayersWriter, which can be further modified. In order to save the copy, a target must be defined:
lrs0 = LayersReader('D:/tmp/DEU_adm_shp/DEU_adm4.shp')
lrs1 = lrs0.copy(target='D:/tmp/DEU_adm_shp/DEU_adm4_copy.shp') # the copy can be modified