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Merged
JamesParrott merged 1 commit into from
May 24, 2026
+667 −448
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Add ShpReader and ShxReader #398

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13 changes: 9 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,12 @@ part of your geospatial project.

# Version Changes

## 3.0.9
## 3.0.9.dev
### Bug fix
- Correct NODATA lower threshold to -1e38 (as per [spec](https://www.esri.com/content/dam/esrisites/sitecore-archive/Files/Pdfs/library/whitepapers/pdfs/shapefile.pdf) 2, Numeric Types). This is 10% of
PyShp's previous threshold -10e38, so it is possible large negative values x (-1e39 < x < -1e38 will now be NODATA.


### Security
- Add python_version >= 3.10 to pre-commit dev & lint groups' 'dependency' (due to CVE in filelock 3.19).

Expand Down Expand Up @@ -514,7 +519,7 @@ and the bounding box area the shapefile covers:
>>> len(sf)
663
>>> sf.bbox
(-122.515048, 37.652916, -122.327622, 37.863433)
BBox(xmin=-122.515048, ymin=37.652916, xmax=-122.327622, ymax=37.863433)

Finally, if you would prefer to work with the entire shapefile in a different
format, you can convert all of it to a GeoJSON dictionary, although you may lose
Expand Down Expand Up @@ -1473,7 +1478,7 @@ Shapefiles containing M-values can be examined in several ways:
>>> r = shapefile.Reader('shapefiles/test/linem')

>>> r.mbox # the lower and upper bound of M-values in the shapefile
(0.0, 3.0)
MBox(mmin=0.0, mmax=3.0)

>>> r.shape(0).m # flat list of M-values
[0.0, None, 3.0, None, 0.0, None, None]
Expand Down Expand Up @@ -1506,7 +1511,7 @@ To examine a Z-type shapefile you can do:
>>> r = shapefile.Reader('shapefiles/test/linez')

>>> r.zbox # the lower and upper bound of Z-values in the shapefile
(0.0, 22.0)
ZBox(zmin=0.0, zmax=22.0)

>>> r.shape(0).z # flat list of Z-values
[18.0, 20.0, 22.0, 0.0, 0.0, 0.0, 0.0, 15.0, 13.0, 14.0]
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5 changes: 5 additions & 0 deletions changelog.txt
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@@ -1,5 +1,10 @@
VERSION 3.0.9.dev

2026-05-23
Bug fix (BREAKING CHANGE):
* Correct NODATA lower threshold to -1e38 (as per [spec](https://www.esri.com/content/dam/esrisites/sitecore-archive/Files/Pdfs/library/whitepapers/pdfs/shapefile.pdf)
page 2, Numeric Types). This is a tenth of PyShp's previous threshold -10e38, but still a huge negative number.

2026-05-20
Security:
* Add python_version >= 3.10 to pre-commit dev & lint groups' 'dependency' (due to CVE in filelock 3.19).
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