Split inline Python code to generate Recommends to a separate Python script.

debian/tests/control.sh

@@ -12,11 +12,7 @@ cat debian/tests/control.in >> debian/tests/control.tmp
 
 sed -i "s#%RECOMMENDS%#$(bin/diffoscope --list-debian-substvars | awk -F= '/diffoscope:Recommends/ { print $2 }')#" debian/tests/control.tmp
 
-sed -i "s#%PYRECOMMENDS%#$(python3 -c "from pep517 import meta; \
-	from pip._internal.req.constructors import install_req_from_req_string; \
-	dist = meta.load('.'); \
-	print(', '.join([f'python3-{install_req_from_req_string(req).name}' for req in sorted(dist.requires) if install_req_from_req_string(req).markers]))" \
-)#" debian/tests/control.tmp
+sed -i "s#%PYRECOMMENDS%#$(debian/tests/generate-recommends.py)#" debian/tests/control.tmp
 
 # Don't test-depend on radare2; not in bullseye for security reasons. (#950372)
 sed -i "s#radare2, ##" debian/tests/control.tmp

debian/tests/generate-recommends.py

+#!/usr/bin/env python3
+
+from pep517 import meta
+
+from pip._internal.req.constructors import install_req_from_req_string
+
+dist = meta.load(".")
+
+xs = set(
+    f"python3-{install_req_from_req_string(x).name}"
+    for x in dist.requires
+    if install_req_from_req_string(x).markers
+)
+
+print(", ".join(sorted(xs)))