python2.7: small cleanup

component/python-2.7/buildout.cfg

@@ -33,11 +33,8 @@ package_version = 2.7.18
 package_version_suffix =
 md5sum = fd6cc8ec0a78c44036f825e739f36e5a
 
-# This is actually the default setting for prefix, but we can't use it in
-# other settings in this part if we don't set it explicitly here.
-prefix = @@LOCATION@@
 version = 2.7
-executable = ${:prefix}/bin/python${:version}
+executable = @@LOCATION@@/bin/python${:version}
 
 patch-options = -p1
 patches =
@@ -61,11 +58,11 @@ make-targets = make profile-opt && make install
 # recent RedHat would otherwise mangle them, either failing ('python' is
 # ambiguous and 'python2' is not supported anymore) or replacing with
 # something that's really wrong (/usr/bin/python...).
-post-install = cd '${:prefix}' &&
+post-install = cd '%(prefix)s' &&
   find -executable -type f -print0 |
   xargs -0 grep -I -m 1 '' |
   sed -n 's,:#! */usr/bin/env \+python2\?$,,p' |
-  xargs -d '\n' sed -i '1s,.*,#!${:executable},'
+  xargs -d '\n' sed -i '1s,.*,#!%(executable)s,'
 
 # the entry "-Wl,-rpath=${file:location}/lib" below is needed by python-magic,
 # which would otherwise load the system libmagic.so with ctypes