ENH: Add explicit PEP 404 version conformance check

Fail early if the version is incompatible with PEP 440.

Author: hjmjohnson

itkVersion.py

@@ -1,5 +1,7 @@
-VERSION = "6.0b1"
+from packaging.version import Version
 
+# Version needs to be python PEP 440 compliant (no leading v)
+VERSION = '6.0b1'.removeprefix("v")
 
 def get_versions():
     """Returns versions for the ITK Python package.
@@ -20,7 +22,10 @@ def get_versions():
     #  '4.11.0.dev20170208+139.g922f2d9'
     get_versions()['package-version']
     """
+
+    Version(VERSION) # Raise InvalidVersion exception if not PEP 440 compliant
+
     versions = {}
-    versions["version"] = VERSION
-    versions["package-version"] = VERSION.split("+")[0]
+    versions['version'] = VERSION
+    versions['package-version'] = VERSION.split('+')[0]
     return versions

scripts/update_python_version.py

@@ -8,6 +8,7 @@
 import os
 import subprocess
 from datetime import datetime
+from packaging.version import Version
 
 argparser = argparse.ArgumentParser(description=__doc__)
 argparser.add_argument("itkSourceDir")
@@ -61,6 +62,9 @@
 
 os.chdir(itkPythonPackageDir)
 itkVersionPath = os.path.join(itkPythonPackageDir, "itkVersion.py")
+
+Version(VERSION) # Raise InvalidVersion exception if not PEP 440 compliant
+
 if not os.path.exists(itkVersionPath):
     print("Expected file " + itkVersionPath + " not found!")
     sys.exit(1)