Why below code does not work-

import fiona
from fiona.crs import from_epsg

my_schema = {'geometry': 'Point', 'properties': {'mean_in': 'str', 'total_h1': 'str', 'total_h2': 'str', 'LOS': 'str', 'id': 'str', 'index': 'str', 'Junctio': 'str', 'intLanes': ':str', 'flow': 'str', 'incLanes': 'str', 'interva1': 'str', 'y': 'str', 'x': 'str', 'entered': 'str', 'type': 'str', 'Incomin': 'str', 'interva2': 'str'}}
wr_dict = {'geometry': {'type': 'Point', 'coordinates': (488901.97760411515, 5078198.250875515)}, 'properties': {'mean_in': '0', 'index': '0', 'Junctio': '0', 'intLanes': ':A_0_0 :A_1_0', 'flow': '0', 'total_h1': '0', 'total_h2': '0', 'LOS': '0', 'incLanes': 'B-A_0 A0-A_0', 'interva1': '0', 'y': '39.18', 'x': '31.72', 'entered': '0', 'type': 'unregulated', 'id': 'A', 'Incomin': '0', 'interva2': '0'}}

with fiona.open("my_shp_clean1.shp", mode='w', driver='ESRI Shapefile', schema=my_schema,crs =from_epsg(32632)) as output:

Rather raises exception as below-

File "C:\Python27\ArcGIS10.3\Lib\site-packages\fiona__init__.py", line 183, in open enabled_drivers=enabled_drivers, crs_wkt=crs_wkt) File "C:\Python27\ArcGIS10.3\Lib\site-packages\fiona\collection.py", line 161, in init self.session.start(self, **kwargs) File "C:\Python27\ArcGIS10.3\Lib\site-packages\fiona\ogrext.pyd", line 890, in fiona.ogrext.WritingSession.start (fiona/ogrext.c:15383)

ValueError: invalid literal for int() with base 10: 'str'

N.B. I am with Fiona (1.6.2),Shapely (1.5.13),GDAL (1.11.3) and python 2.7 in windows 8

1 Answer 1


I guess its because you have a typo in your schema properties : 'intLanes': ':str' should be changed to 'intLanes': 'str' (the colon before str).

  • Thanks, What about the second part of the question, why ValueError: invalid literal for int() with base 10: 'str' is raised?
    – Learner
    Commented Jan 16, 2016 at 5:19
  • You might find that fiona (and underneath ogr) default to an int datatype when they don't understand the schema. You'd have to check the source to be sure though.
    – om_henners
    Commented Jan 16, 2016 at 8:54
  • 1
    Because, with your schema, Fiona don't know what is the ':str'format and, by defaut, it choose the first format that is int
    – gene
    Commented Jan 16, 2016 at 17:16

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