dump_things_pyclient/commands/json2ttl.py

@@ -5,10 +5,17 @@ import json
 import re
 import sys
 
+# The try-except clause is required because marking scripts as optional does
+# not work. That means, even scripts marked as optional are always installed
+# (see <https://stackoverflow.com/questions/77501716/pyproject-toml-setuptools-how-can-i-specify-optional-scripts-and-modules>)
+try:
     from dump_things_service.converter import (
         Format,
         FormatConverter,
     )
+except ImportError:
+    print(f"Please install 'dump-things-pyclient[ttl]' to use this command.")
+    sys.exit(0)
 
 
 description = f"""Read JSON records from stdin and convert them to TTL

pyproject.toml

@@ -8,11 +8,13 @@ authors = [
     {name="Christian Mönch", email="christian.moench@web.de"},
 ]
 dependencies = [
-    "dump-things-service>=5.3.0",
     "requests>=2.32.5",
 ]
 
-[dependency-groups]
+[project.optional-dependencies]
+ttl = [
+    "dump-things-service>=5.3.0",
+]
 tests = [
     "pytest>=9.0.1",
 ]