Drop python 3.7 (and 2.7) for recipes under dev-python/

Recipes with only 3.7 are left alone. Help with #8025.

dev-python/rdflib/rdflib-5.0.0.recipe

@@ -4,7 +4,7 @@ yet powerful language for representing information as graphs."
 HOMEPAGE="https://github.com/RDFLib/rdflib"
 COPYRIGHT="2002-2017 RDFLib Team"
 LICENSE="BSD (3-clause)"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://pypi.io/packages/source/r/rdflib/rdflib-$portVersion.tar.gz"
 CHECKSUM_SHA256="78149dd49d385efec3b3adfbd61c87afaf1281c30d3fcaf1b323b34f603fb155"
 
@@ -21,8 +21,8 @@ BUILD_REQUIRES="
 	haiku_devel
 	"
 
-PYTHON_PACKAGES=(python python3 python38 python39)
-PYTHON_VERSIONS=(2.7 3.7 3.8 3.9)
+PYTHON_PACKAGES=(python38 python39)
+PYTHON_VERSIONS=(3.8 3.9)
 for i in "${!PYTHON_PACKAGES[@]}"; do
 	pythonPackage=${PYTHON_PACKAGES[i]}
 	pythonVersion=${PYTHON_VERSIONS[$i]}
@@ -39,8 +39,8 @@ for i in "${!PYTHON_PACKAGES[@]}"; do
 		haiku
 		cmd:python$pythonVersion
 		\""
-	if [ $pythonPackage = python3 ]; then
-		PROVIDES_python3+="
+	if [ $pythonPackage = python39 ]; then
+		PROVIDES_python39+="
 			cmd:csv2rdf
 			cmd:rdf2dot
 			cmd:rdfgraphisomorphism
@@ -87,7 +87,7 @@ INSTALL()
 			--root=/ --prefix="$prefix"
 
 		maybeBinDir="$binDir"
-		if [ "$pythonPackage" != python3 ]; then
+		if [ "$pythonPackage" != python39 ]; then
 			rm -rf "$binDir"
 			maybeBinDir=
 		fi